terraform/terraform/context_test.go

package terraform

import (
	"fmt"
	"reflect"
	"strings"
	"sync"
	"testing"
	"sort"
)

func TestContextGraph(t *testing.T) {
	p := testProvider("aws")
	m := testModule(t, "validate-good")
	c := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	g, err := c.Graph()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(g.String())
	expected := strings.TrimSpace(testContextGraph)
	if actual != expected {
		t.Fatalf("bad: %s", actual)
	}
}

func TestContextValidate(t *testing.T) {
	p := testProvider("aws")
	m := testModule(t, "validate-good")
	c := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	w, e := c.Validate()
	if len(w) > 0 {
		t.Fatalf("bad: %#v", w)
	}
	if len(e) > 0 {
		t.Fatalf("bad: %#v", e)
	}
}

func TestContextValidate_goodModule(t *testing.T) {
	p := testProvider("aws")
	m := testModule(t, "validate-good-module")
	c := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	w, e := c.Validate()
	if len(w) > 0 {
		t.Fatalf("bad: %#v", w)
	}
	if len(e) > 0 {
		t.Fatalf("bad: %#v", e)
	}
}

func TestContextValidate_badModuleOutput(t *testing.T) {
	p := testProvider("aws")
	m := testModule(t, "validate-bad-module-output")
	c := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	w, e := c.Validate()
	if len(w) > 0 {
		t.Fatalf("bad: %#v", w)
	}
	if len(e) == 0 {
		t.Fatalf("bad: %#v", e)
	}
}

func TestContextValidate_badVar(t *testing.T) {
	p := testProvider("aws")
	m := testModule(t, "validate-bad-var")
	c := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	w, e := c.Validate()
	if len(w) > 0 {
		t.Fatalf("bad: %#v", w)
	}
	if len(e) == 0 {
		t.Fatalf("bad: %#v", e)
	}
}

func TestContextValidate_moduleBadResource(t *testing.T) {
	m := testModule(t, "validate-module-bad-rc")
	p := testProvider("aws")
	c := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	p.ValidateResourceReturnErrors = []error{fmt.Errorf("bad")}

	w, e := c.Validate()
	if len(w) > 0 {
		t.Fatalf("bad: %#v", w)
	}
	if len(e) == 0 {
		t.Fatalf("bad: %#v", e)
	}
}

func TestContextValidate_moduleProviderInherit(t *testing.T) {
	m := testModule(t, "validate-module-pc-inherit")
	p := testProvider("aws")
	c := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	p.ValidateFn = func(c *ResourceConfig) ([]string, []error) {
		return nil, c.CheckSet([]string{"set"})
	}

	w, e := c.Validate()
	if len(w) > 0 {
		t.Fatalf("bad: %#v", w)
	}
	if len(e) > 0 {
		t.Fatalf("bad: %#v", e)
	}
}

func TestContextValidate_orphans(t *testing.T) {
	p := testProvider("aws")
	m := testModule(t, "validate-good")
	state := &State{
		Modules: []*ModuleState{
			&ModuleState{
				Path: rootModulePath,
				Resources: map[string]*ResourceState{
					"aws_instance.web": &ResourceState{
						Type: "aws_instance",
						Primary: &InstanceState{
							ID: "bar",
						},
					},
				},
			},
		},
	}
	c := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: state,
	})

	p.ValidateResourceFn = func(
		t string, c *ResourceConfig) ([]string, []error) {
		return nil, c.CheckSet([]string{"foo"})
	}

	w, e := c.Validate()
	if len(w) > 0 {
		t.Fatalf("bad: %#v", w)
	}
	if len(e) > 0 {
		t.Fatalf("bad: %#v", e)
	}
}

func TestContextValidate_providerConfig_bad(t *testing.T) {
	m := testModule(t, "validate-bad-pc")
	p := testProvider("aws")
	c := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	p.ValidateReturnErrors = []error{fmt.Errorf("bad")}

	w, e := c.Validate()
	if len(w) > 0 {
		t.Fatalf("bad: %#v", w)
	}
	if len(e) == 0 {
		t.Fatalf("bad: %#v", e)
	}
}

func TestContextValidate_providerConfig_badEmpty(t *testing.T) {
	m := testModule(t, "validate-bad-pc-empty")
	p := testProvider("aws")
	c := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	p.ValidateReturnErrors = []error{fmt.Errorf("bad")}

	w, e := c.Validate()
	if len(w) > 0 {
		t.Fatalf("bad: %#v", w)
	}
	if len(e) == 0 {
		t.Fatalf("bad: %#v", e)
	}
}

func TestContextValidate_providerConfig_good(t *testing.T) {
	m := testModule(t, "validate-bad-pc")
	p := testProvider("aws")
	c := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	w, e := c.Validate()
	if len(w) > 0 {
		t.Fatalf("bad: %#v", w)
	}
	if len(e) > 0 {
		t.Fatalf("bad: %#v", e)
	}
}

func TestContextValidate_resourceConfig_bad(t *testing.T) {
	m := testModule(t, "validate-bad-rc")
	p := testProvider("aws")
	c := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	p.ValidateResourceReturnErrors = []error{fmt.Errorf("bad")}

	w, e := c.Validate()
	if len(w) > 0 {
		t.Fatalf("bad: %#v", w)
	}
	if len(e) == 0 {
		t.Fatalf("bad: %#v", e)
	}
}

func TestContextValidate_resourceConfig_good(t *testing.T) {
	m := testModule(t, "validate-bad-rc")
	p := testProvider("aws")
	c := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	w, e := c.Validate()
	if len(w) > 0 {
		t.Fatalf("bad: %#v", w)
	}
	if len(e) > 0 {
		t.Fatalf("bad: %#v", e)
	}
}

func TestContextValidate_requiredVar(t *testing.T) {
	m := testModule(t, "validate-required-var")
	c := testContext(t, &ContextOpts{
		Module: m,
	})

	w, e := c.Validate()
	if len(w) > 0 {
		t.Fatalf("bad: %#v", w)
	}
	if len(e) == 0 {
		t.Fatalf("bad: %#v", e)
	}
}

func TestContextValidate_provisionerConfig_bad(t *testing.T) {
	m := testModule(t, "validate-bad-prov-conf")
	p := testProvider("aws")
	pr := testProvisioner()
	c := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		Provisioners: map[string]ResourceProvisionerFactory{
			"shell": testProvisionerFuncFixed(pr),
		},
	})

	pr.ValidateReturnErrors = []error{fmt.Errorf("bad")}

	w, e := c.Validate()
	if len(w) > 0 {
		t.Fatalf("bad: %#v", w)
	}
	if len(e) == 0 {
		t.Fatalf("bad: %#v", e)
	}
}

func TestContextValidate_provisionerConfig_good(t *testing.T) {
	m := testModule(t, "validate-bad-prov-conf")
	p := testProvider("aws")
	pr := testProvisioner()
	pr.ValidateFn = func(c *ResourceConfig) ([]string, []error) {
		if c == nil {
			t.Fatalf("missing resource config for provisioner")
		}
		return nil, nil
	}
	c := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		Provisioners: map[string]ResourceProvisionerFactory{
			"shell": testProvisionerFuncFixed(pr),
		},
	})

	w, e := c.Validate()
	if len(w) > 0 {
		t.Fatalf("bad: %#v", w)
	}
	if len(e) > 0 {
		t.Fatalf("bad: %#v", e)
	}
}

func TestContextValidate_selfRef(t *testing.T) {
	p := testProvider("aws")
	m := testModule(t, "validate-self-ref")
	c := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	w, e := c.Validate()
	if len(w) > 0 {
		t.Fatalf("bad: %#v", w)
	}
	if len(e) == 0 {
		t.Fatalf("bad: %#v", e)
	}
}

func TestContextValidate_selfRefMulti(t *testing.T) {
	p := testProvider("aws")
	m := testModule(t, "validate-self-ref-multi")
	c := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	w, e := c.Validate()
	if len(w) > 0 {
		t.Fatalf("bad: %#v", w)
	}
	if len(e) == 0 {
		t.Fatalf("bad: %#v", e)
	}
}

func TestContextValidate_selfRefMultiAll(t *testing.T) {
	p := testProvider("aws")
	m := testModule(t, "validate-self-ref-multi-all")
	c := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	w, e := c.Validate()
	if len(w) > 0 {
		t.Fatalf("bad: %#v", w)
	}
	if len(e) == 0 {
		t.Fatalf("bad: %#v", e)
	}
}

func TestContextApply(t *testing.T) {
	m := testModule(t, "apply-good")
	p := testProvider("aws")
	p.ApplyFn = testApplyFn
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	state, err := ctx.Apply()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	mod := state.RootModule()
	if len(mod.Resources) < 2 {
		t.Fatalf("bad: %#v", mod.Resources)
	}

	actual := strings.TrimSpace(state.String())
	expected := strings.TrimSpace(testTerraformApplyStr)
	if actual != expected {
		t.Fatalf("bad: \n%s", actual)
	}
}

func TestContextApply_Minimal(t *testing.T) {
	m := testModule(t, "apply-minimal")
	p := testProvider("aws")
	p.ApplyFn = testApplyFn
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	state, err := ctx.Apply()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(state.String())
	expected := strings.TrimSpace(testTerraformApplyMinimalStr)
	if actual != expected {
		t.Fatalf("bad: \n%s", actual)
	}
}

func TestContextApply_badDiff(t *testing.T) {
	m := testModule(t, "apply-good")
	p := testProvider("aws")
	p.ApplyFn = testApplyFn
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	p.DiffFn = func(*InstanceInfo, *InstanceState, *ResourceConfig) (*InstanceDiff, error) {
		return &InstanceDiff{
			Attributes: map[string]*ResourceAttrDiff{
				"newp": nil,
			},
		}, nil
	}

	if _, err := ctx.Apply(); err == nil {
		t.Fatal("should error")
	}
}

func TestContextApply_cancel(t *testing.T) {
	stopped := false

	m := testModule(t, "apply-cancel")
	p := testProvider("aws")
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	p.ApplyFn = func(*InstanceInfo, *InstanceState, *InstanceDiff) (*InstanceState, error) {
		if !stopped {
			stopped = true
			go ctx.Stop()

			for {
				if ctx.sh.Stopped() {
					break
				}
			}
		}

		return &InstanceState{
			ID: "foo",
			Attributes: map[string]string{
				"num": "2",
			},
		}, nil
	}
	p.DiffFn = func(*InstanceInfo, *InstanceState, *ResourceConfig) (*InstanceDiff, error) {
		return &InstanceDiff{
			Attributes: map[string]*ResourceAttrDiff{
				"num": &ResourceAttrDiff{
					New: "bar",
				},
			},
		}, nil
	}

	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Start the Apply in a goroutine
	stateCh := make(chan *State)
	go func() {
		state, err := ctx.Apply()
		if err != nil {
			panic(err)
		}

		stateCh <- state
	}()

	state := <-stateCh

	mod := state.RootModule()
	if len(mod.Resources) != 1 {
		t.Fatalf("bad: %#v", mod.Resources)
	}

	actual := strings.TrimSpace(state.String())
	expected := strings.TrimSpace(testTerraformApplyCancelStr)
	if actual != expected {
		t.Fatalf("bad: \n%s", actual)
	}
}

func TestContextApply_compute(t *testing.T) {
	m := testModule(t, "apply-compute")
	p := testProvider("aws")
	p.ApplyFn = testApplyFn
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	ctx.variables = map[string]string{"value": "1"}

	state, err := ctx.Apply()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(state.String())
	expected := strings.TrimSpace(testTerraformApplyComputeStr)
	if actual != expected {
		t.Fatalf("bad: \n%s", actual)
	}
}

func TestContextApply_module(t *testing.T) {
	m := testModule(t, "apply-module")
	p := testProvider("aws")
	p.ApplyFn = testApplyFn
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	state, err := ctx.Apply()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(state.String())
	expected := strings.TrimSpace(testTerraformApplyModuleStr)
	if actual != expected {
		t.Fatalf("bad: \n%s", actual)
	}
}

func TestContextApply_nilDiff(t *testing.T) {
	m := testModule(t, "apply-good")
	p := testProvider("aws")
	p.ApplyFn = testApplyFn
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	p.DiffFn = func(*InstanceInfo, *InstanceState, *ResourceConfig) (*InstanceDiff, error) {
		return nil, nil
	}

	if _, err := ctx.Apply(); err == nil {
		t.Fatal("should error")
	}
}

func TestContextApply_Provisioner_compute(t *testing.T) {
	m := testModule(t, "apply-provisioner-compute")
	p := testProvider("aws")
	pr := testProvisioner()
	p.ApplyFn = testApplyFn
	p.DiffFn = testDiffFn
	pr.ApplyFn = func(rs *InstanceState, c *ResourceConfig) error {
		val, ok := c.Config["foo"]
		if !ok || val != "computed_dynamical" {
			t.Fatalf("bad value for foo: %v %#v", val, c)
		}

		return nil
	}
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		Provisioners: map[string]ResourceProvisionerFactory{
			"shell": testProvisionerFuncFixed(pr),
		},
		Variables: map[string]string{
			"value": "1",
		},
	})

	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	state, err := ctx.Apply()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(state.String())
	expected := strings.TrimSpace(testTerraformApplyProvisionerStr)
	if actual != expected {
		t.Fatalf("bad: \n%s", actual)
	}

	// Verify apply was invoked
	if !pr.ApplyCalled {
		t.Fatalf("provisioner not invoked")
	}
}

func TestContextApply_provisionerFail(t *testing.T) {
	m := testModule(t, "apply-provisioner-fail")
	p := testProvider("aws")
	pr := testProvisioner()
	p.ApplyFn = testApplyFn
	p.DiffFn = testDiffFn

	pr.ApplyFn = func(*InstanceState, *ResourceConfig) error {
		return fmt.Errorf("EXPLOSION")
	}

	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		Provisioners: map[string]ResourceProvisionerFactory{
			"shell": testProvisionerFuncFixed(pr),
		},
		Variables: map[string]string{
			"value": "1",
		},
	})

	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	state, err := ctx.Apply()
	if err == nil {
		t.Fatal("should error")
	}

	actual := strings.TrimSpace(state.String())
	expected := strings.TrimSpace(testTerraformApplyProvisionerFailStr)
	if actual != expected {
		t.Fatalf("bad: \n%s", actual)
	}
}

func TestContextApply_provisionerResourceRef(t *testing.T) {
	m := testModule(t, "apply-provisioner-resource-ref")
	p := testProvider("aws")
	pr := testProvisioner()
	p.ApplyFn = testApplyFn
	p.DiffFn = testDiffFn
	pr.ApplyFn = func(rs *InstanceState, c *ResourceConfig) error {
		val, ok := c.Config["foo"]
		if !ok || val != "2" {
			t.Fatalf("bad value for foo: %v %#v", val, c)
		}

		return nil
	}

	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		Provisioners: map[string]ResourceProvisionerFactory{
			"shell": testProvisionerFuncFixed(pr),
		},
	})

	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	state, err := ctx.Apply()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(state.String())
	expected := strings.TrimSpace(testTerraformApplyProvisionerResourceRefStr)
	if actual != expected {
		t.Fatalf("bad: \n%s", actual)
	}

	// Verify apply was invoked
	if !pr.ApplyCalled {
		t.Fatalf("provisioner not invoked")
	}
}

func TestContextApply_outputDiffVars(t *testing.T) {
	m := testModule(t, "apply-good")
	p := testProvider("aws")
	s := &State{
		Modules: []*ModuleState{
			&ModuleState{
				Path: rootModulePath,
				Resources: map[string]*ResourceState{
					"aws_instance.baz": &ResourceState{
						Type: "aws_instance",
						Primary: &InstanceState{
							ID: "bar",
						},
					},
				},
			},
		},
	}
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: s,
	})

	p.ApplyFn = func(info *InstanceInfo, s *InstanceState, d *InstanceDiff) (*InstanceState, error) {
		for k, ad := range d.Attributes {
			if ad.NewComputed {
				return nil, fmt.Errorf("%s: computed", k)
			}
		}

		result := s.MergeDiff(d)
		result.ID = "foo"
		return result, nil
	}
	p.DiffFn = func(*InstanceInfo, *InstanceState, *ResourceConfig) (*InstanceDiff, error) {
		return &InstanceDiff{
			Attributes: map[string]*ResourceAttrDiff{
				"foo": &ResourceAttrDiff{
					NewComputed: true,
					Type:        DiffAttrOutput,
				},
				"bar": &ResourceAttrDiff{
					New: "baz",
				},
			},
		}, nil
	}

	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}
	if _, err := ctx.Apply(); err != nil {
		t.Fatalf("err: %s", err)
	}
}

func TestContextApply_Provisioner_ConnInfo(t *testing.T) {
	m := testModule(t, "apply-provisioner-conninfo")
	p := testProvider("aws")
	pr := testProvisioner()

	p.ApplyFn = func(info *InstanceInfo, s *InstanceState, d *InstanceDiff) (*InstanceState, error) {
		if s.Ephemeral.ConnInfo == nil {
			t.Fatalf("ConnInfo not initialized")
		}

		result, _ := testApplyFn(info, s, d)
		result.Ephemeral.ConnInfo = map[string]string{
			"type": "ssh",
			"host": "127.0.0.1",
			"port": "22",
		}
		return result, nil
	}
	p.DiffFn = testDiffFn

	pr.ApplyFn = func(rs *InstanceState, c *ResourceConfig) error {
		conn := rs.Ephemeral.ConnInfo
		if conn["type"] != "telnet" {
			t.Fatalf("Bad: %#v", conn)
		}
		if conn["host"] != "127.0.0.1" {
			t.Fatalf("Bad: %#v", conn)
		}
		if conn["port"] != "2222" {
			t.Fatalf("Bad: %#v", conn)
		}
		if conn["user"] != "superuser" {
			t.Fatalf("Bad: %#v", conn)
		}
		if conn["pass"] != "test" {
			t.Fatalf("Bad: %#v", conn)
		}

		return nil
	}

	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		Provisioners: map[string]ResourceProvisionerFactory{
			"shell": testProvisionerFuncFixed(pr),
		},
		Variables: map[string]string{
			"value": "1",
			"pass":  "test",
		},
	})

	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	state, err := ctx.Apply()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(state.String())
	expected := strings.TrimSpace(testTerraformApplyProvisionerStr)
	if actual != expected {
		t.Fatalf("bad: \n%s", actual)
	}

	// Verify apply was invoked
	if !pr.ApplyCalled {
		t.Fatalf("provisioner not invoked")
	}
}

func TestContextApply_destroy(t *testing.T) {
	m := testModule(t, "apply-destroy")
	h := new(HookRecordApplyOrder)
	p := testProvider("aws")
	p.ApplyFn = testApplyFn
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Hooks:  []Hook{h},
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	// First plan and apply a create operation
	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	if _, err := ctx.Apply(); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Next, plan and apply a destroy operation
	if _, err := ctx.Plan(&PlanOpts{Destroy: true}); err != nil {
		t.Fatalf("err: %s", err)
	}

	h.Active = true

	state, err := ctx.Apply()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	// Test that things were destroyed
	actual := strings.TrimSpace(state.String())
	expected := strings.TrimSpace(testTerraformApplyDestroyStr)
	if actual != expected {
		t.Fatalf("bad: \n%s", actual)
	}

	// Test that things were destroyed _in the right order_
	expected2 := []string{"aws_instance.bar", "aws_instance.foo"}
	actual2 := h.IDs
	if !reflect.DeepEqual(actual2, expected2) {
		t.Fatalf("bad: %#v", actual2)
	}
}

func TestContextApply_destroyOutputs(t *testing.T) {
	m := testModule(t, "apply-destroy-outputs")
	h := new(HookRecordApplyOrder)
	p := testProvider("aws")
	p.ApplyFn = testApplyFn
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Hooks:  []Hook{h},
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	// First plan and apply a create operation
	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	if _, err := ctx.Apply(); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Next, plan and apply a destroy operation
	if _, err := ctx.Plan(&PlanOpts{Destroy: true}); err != nil {
		t.Fatalf("err: %s", err)
	}

	h.Active = true

	state, err := ctx.Apply()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	mod := state.RootModule()
	if len(mod.Resources) > 0 {
		t.Fatalf("bad: %#v", mod)
	}
}

func TestContextApply_destroyOrphan(t *testing.T) {
	m := testModule(t, "apply-error")
	p := testProvider("aws")
	s := &State{
		Modules: []*ModuleState{
			&ModuleState{
				Path: rootModulePath,
				Resources: map[string]*ResourceState{
					"aws_instance.baz": &ResourceState{
						Type: "aws_instance",
						Primary: &InstanceState{
							ID: "bar",
						},
					},
				},
			},
		},
	}
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: s,
	})

	p.ApplyFn = func(info *InstanceInfo, s *InstanceState, d *InstanceDiff) (*InstanceState, error) {
		if d.Destroy {
			return nil, nil
		}

		result := s.MergeDiff(d)
		result.ID = "foo"
		return result, nil
	}
	p.DiffFn = func(*InstanceInfo, *InstanceState, *ResourceConfig) (*InstanceDiff, error) {
		return &InstanceDiff{
			Attributes: map[string]*ResourceAttrDiff{
				"num": &ResourceAttrDiff{
					New: "bar",
				},
			},
		}, nil
	}

	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	state, err := ctx.Apply()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	mod := state.RootModule()
	if _, ok := mod.Resources["aws_instance.baz"]; ok {
		t.Fatalf("bad: %#v", mod.Resources)
	}
}

func TestContextApply_error(t *testing.T) {
	errored := false

	m := testModule(t, "apply-error")
	p := testProvider("aws")
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	p.ApplyFn = func(*InstanceInfo, *InstanceState, *InstanceDiff) (*InstanceState, error) {
		if errored {
			state := &InstanceState{
				ID: "bar",
			}
			return state, fmt.Errorf("error")
		}
		errored = true

		return &InstanceState{
			ID: "foo",
			Attributes: map[string]string{
				"num": "2",
			},
		}, nil
	}
	p.DiffFn = func(*InstanceInfo, *InstanceState, *ResourceConfig) (*InstanceDiff, error) {
		return &InstanceDiff{
			Attributes: map[string]*ResourceAttrDiff{
				"num": &ResourceAttrDiff{
					New: "bar",
				},
			},
		}, nil
	}

	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	state, err := ctx.Apply()
	if err == nil {
		t.Fatal("should have error")
	}

	actual := strings.TrimSpace(state.String())
	expected := strings.TrimSpace(testTerraformApplyErrorStr)
	if actual != expected {
		t.Fatalf("bad: \n%s", actual)
	}
}

func TestContextApply_errorPartial(t *testing.T) {
	errored := false

	m := testModule(t, "apply-error")
	p := testProvider("aws")
	s := &State{
		Modules: []*ModuleState{
			&ModuleState{
				Path: rootModulePath,
				Resources: map[string]*ResourceState{
					"aws_instance.bar": &ResourceState{
						Type: "aws_instance",
						Primary: &InstanceState{
							ID: "bar",
						},
					},
				},
			},
		},
	}
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: s,
	})

	p.ApplyFn = func(info *InstanceInfo, s *InstanceState, d *InstanceDiff) (*InstanceState, error) {
		if errored {
			return s, fmt.Errorf("error")
		}
		errored = true

		return &InstanceState{
			ID: "foo",
			Attributes: map[string]string{
				"num": "2",
			},
		}, nil
	}
	p.DiffFn = func(*InstanceInfo, *InstanceState, *ResourceConfig) (*InstanceDiff, error) {
		return &InstanceDiff{
			Attributes: map[string]*ResourceAttrDiff{
				"num": &ResourceAttrDiff{
					New: "bar",
				},
			},
		}, nil
	}

	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	state, err := ctx.Apply()
	if err == nil {
		t.Fatal("should have error")
	}

	mod := state.RootModule()
	if len(mod.Resources) != 2 {
		t.Fatalf("bad: %#v", mod.Resources)
	}

	actual := strings.TrimSpace(state.String())
	expected := strings.TrimSpace(testTerraformApplyErrorPartialStr)
	if actual != expected {
		t.Fatalf("bad: \n%s", actual)
	}
}

func TestContextApply_hook(t *testing.T) {
	m := testModule(t, "apply-good")
	h := new(MockHook)
	p := testProvider("aws")
	p.ApplyFn = testApplyFn
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Hooks:  []Hook{h},
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	if _, err := ctx.Apply(); err != nil {
		t.Fatalf("err: %s", err)
	}

	if !h.PreApplyCalled {
		t.Fatal("should be called")
	}
	if !h.PostApplyCalled {
		t.Fatal("should be called")
	}
}

func TestContextApply_idAttr(t *testing.T) {
	m := testModule(t, "apply-idattr")
	p := testProvider("aws")
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	p.ApplyFn = func(info *InstanceInfo, s *InstanceState, d *InstanceDiff) (*InstanceState, error) {
		result := s.MergeDiff(d)
		result.ID = "foo"
		result.Attributes = map[string]string{
			"id": "bar",
		}

		return result, nil
	}
	p.DiffFn = func(*InstanceInfo, *InstanceState, *ResourceConfig) (*InstanceDiff, error) {
		return &InstanceDiff{
			Attributes: map[string]*ResourceAttrDiff{
				"num": &ResourceAttrDiff{
					New: "bar",
				},
			},
		}, nil
	}

	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	state, err := ctx.Apply()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	mod := state.RootModule()
	rs, ok := mod.Resources["aws_instance.foo"]
	if !ok {
		t.Fatal("not in state")
	}
	if rs.Primary.ID != "foo" {
		t.Fatalf("bad: %#v", rs.Primary.ID)
	}
	if rs.Primary.Attributes["id"] != "foo" {
		t.Fatalf("bad: %#v", rs.Primary.Attributes)
	}
}

func TestContextApply_output(t *testing.T) {
	m := testModule(t, "apply-output")
	p := testProvider("aws")
	p.ApplyFn = testApplyFn
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	state, err := ctx.Apply()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(state.String())
	expected := strings.TrimSpace(testTerraformApplyOutputStr)
	if actual != expected {
		t.Fatalf("bad: \n%s", actual)
	}
}

func TestContextApply_outputMulti(t *testing.T) {
	m := testModule(t, "apply-output-multi")
	p := testProvider("aws")
	p.ApplyFn = testApplyFn
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	state, err := ctx.Apply()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(state.String())
	expected := strings.TrimSpace(testTerraformApplyOutputMultiStr)
	if actual != expected {
		t.Fatalf("bad: \n%s", actual)
	}
}

func TestContextApply_outputMultiIndex(t *testing.T) {
	m := testModule(t, "apply-output-multi-index")
	p := testProvider("aws")
	p.ApplyFn = testApplyFn
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	state, err := ctx.Apply()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(state.String())
	expected := strings.TrimSpace(testTerraformApplyOutputMultiIndexStr)
	if actual != expected {
		t.Fatalf("bad: \n%s", actual)
	}
}

func TestContextApply_taint(t *testing.T) {
	m := testModule(t, "apply-taint")
	p := testProvider("aws")
	p.ApplyFn = testApplyFn
	p.DiffFn = testDiffFn
	s := &State{
		Modules: []*ModuleState{
			&ModuleState{
				Path: rootModulePath,
				Resources: map[string]*ResourceState{
					"aws_instance.bar": &ResourceState{
						Type: "aws_instance",
						Tainted: []*InstanceState{
							&InstanceState{
								ID: "baz",
								Attributes: map[string]string{
									"num":  "2",
									"type": "aws_instance",
								},
							},
						},
					},
				},
			},
		},
	}
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: s,
	})

	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	state, err := ctx.Apply()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(state.String())
	expected := strings.TrimSpace(testTerraformApplyTaintStr)
	if actual != expected {
		t.Fatalf("bad:\n%s", actual)
	}
}

func TestContextApply_unknownAttribute(t *testing.T) {
	m := testModule(t, "apply-unknown")
	p := testProvider("aws")
	p.ApplyFn = testApplyFn
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	state, err := ctx.Apply()
	if err == nil {
		t.Fatal("should error")
	}

	actual := strings.TrimSpace(state.String())
	expected := strings.TrimSpace(testTerraformApplyUnknownAttrStr)
	if actual != expected {
		t.Fatalf("bad: \n%s", actual)
	}
}

func TestContextApply_vars(t *testing.T) {
	m := testModule(t, "apply-vars")
	p := testProvider("aws")
	p.ApplyFn = testApplyFn
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		Variables: map[string]string{
			"foo":            "us-west-2",
			"amis.us-east-1": "override",
		},
	})

	w, e := ctx.Validate()
	if len(w) > 0 {
		t.Fatalf("bad: %#v", w)
	}
	if len(e) > 0 {
		t.Fatalf("bad: %s", e)
	}

	if _, err := ctx.Plan(nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	state, err := ctx.Apply()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(state.String())
	expected := strings.TrimSpace(testTerraformApplyVarsStr)
	if actual != expected {
		t.Fatalf("bad: \n%s", actual)
	}
}

func TestContextPlan(t *testing.T) {
	m := testModule(t, "plan-good")
	p := testProvider("aws")
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	plan, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	if len(plan.Diff.RootModule().Resources) < 2 {
		t.Fatalf("bad: %#v", plan.Diff.RootModule().Resources)
	}

	actual := strings.TrimSpace(plan.String())
	expected := strings.TrimSpace(testTerraformPlanStr)
	if actual != expected {
		t.Fatalf("bad:\n%s", actual)
	}
}

func TestContextPlan_minimal(t *testing.T) {
	m := testModule(t, "plan-empty")
	p := testProvider("aws")
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	plan, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(plan.String())
	expected := strings.TrimSpace(testTerraformPlanEmptyStr)
	if actual != expected {
		t.Fatalf("bad:\n%s", actual)
	}
}

func TestContextPlan_modules(t *testing.T) {
	m := testModule(t, "plan-modules")
	p := testProvider("aws")
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	plan, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(plan.String())
	expected := strings.TrimSpace(testTerraformPlanModulesStr)
	if actual != expected {
		t.Fatalf("bad:\n%s", actual)
	}
}

func TestContextPlan_moduleInput(t *testing.T) {
	m := testModule(t, "plan-module-input")
	p := testProvider("aws")
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	plan, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(plan.String())
	expected := strings.TrimSpace(testTerraformPlanModuleInputStr)
	if actual != expected {
		t.Fatalf("bad:\n%s", actual)
	}
}

func TestContextPlan_moduleInputComputed(t *testing.T) {
	m := testModule(t, "plan-module-input-computed")
	p := testProvider("aws")
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	plan, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(plan.String())
	expected := strings.TrimSpace(testTerraformPlanModuleInputComputedStr)
	if actual != expected {
		t.Fatalf("bad:\n%s", actual)
	}
}

func TestContextPlan_moduleInputFromVar(t *testing.T) {
	m := testModule(t, "plan-module-input-var")
	p := testProvider("aws")
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		Variables: map[string]string{
			"foo": "52",
		},
	})

	plan, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(plan.String())
	expected := strings.TrimSpace(testTerraformPlanModuleInputVarStr)
	if actual != expected {
		t.Fatalf("bad:\n%s", actual)
	}
}
func TestContextPlan_moduleOrphans(t *testing.T) {
	m := testModule(t, "plan-modules-remove")
	p := testProvider("aws")
	p.DiffFn = testDiffFn
	s := &State{
		Modules: []*ModuleState{
			&ModuleState{
				Path: []string{"root", "child"},
				Resources: map[string]*ResourceState{
					"aws_instance.foo": &ResourceState{
						Type: "aws_instance",
						Primary: &InstanceState{
							ID: "baz",
						},
					},
				},
			},
		},
	}
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: s,
	})

	plan, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(plan.String())
	expected := strings.TrimSpace(testTerraformPlanModuleOrphansStr)
	if actual != expected {
		t.Fatalf("bad:\n%s", actual)
	}
}

func TestContextPlan_moduleProviderInherit(t *testing.T) {
	var l sync.Mutex
	var calls []string

	m := testModule(t, "plan-module-provider-inherit")
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": func() (ResourceProvider, error) {
				l.Lock()
				defer l.Unlock()

				p := testProvider("aws")
				p.ConfigureFn = func(c *ResourceConfig) error {
					if v, ok := c.Get("from"); !ok || v.(string) != "root" {
						return fmt.Errorf("bad")
					}

					return nil
				}
				p.DiffFn = func(
					info *InstanceInfo,
					state *InstanceState,
					c *ResourceConfig) (*InstanceDiff, error) {
					v, _ := c.Get("from")
					calls = append(calls, v.(string))
					return testDiffFn(info, state, c)
				}
				return p, nil
			},
		},
	})

	_, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := calls
	sort.Strings(actual)
	expected := []string{"child", "root"}
	if !reflect.DeepEqual(actual, expected) {
		t.Fatalf("bad: %#v", actual)
	}
}

func TestContextPlan_moduleProviderDefaults(t *testing.T) {
	var l sync.Mutex
	var calls []string
	toCount := 0

	m := testModule(t, "plan-module-provider-defaults")
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": func() (ResourceProvider, error) {
				l.Lock()
				defer l.Unlock()

				p := testProvider("aws")
				p.ConfigureFn = func(c *ResourceConfig) error {
					if v, ok := c.Get("from"); !ok || v.(string) != "root" {
						return fmt.Errorf("bad")
					}
					if v, ok := c.Get("to"); ok && v.(string) == "child" {
						toCount++
					}

					return nil
				}
				p.DiffFn = func(
					info *InstanceInfo,
					state *InstanceState,
					c *ResourceConfig) (*InstanceDiff, error) {
					v, _ := c.Get("from")
					calls = append(calls, v.(string))
					return testDiffFn(info, state, c)
				}
				return p, nil
			},
		},
	})

	_, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	if toCount != 1 {
		t.Fatal("provider in child didn't set proper config")
	}

	actual := calls
	sort.Strings(actual)
	expected := []string{"child", "root"}
	if !reflect.DeepEqual(actual, expected) {
		t.Fatalf("bad: %#v", actual)
	}
}

func TestContextPlan_moduleVar(t *testing.T) {
	m := testModule(t, "plan-module-var")
	p := testProvider("aws")
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	plan, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(plan.String())
	expected := strings.TrimSpace(testTerraformPlanModuleVarStr)
	if actual != expected {
		t.Fatalf("bad:\n%s", actual)
	}
}

func TestContextPlan_moduleVarComputed(t *testing.T) {
	m := testModule(t, "plan-module-var-computed")
	p := testProvider("aws")
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	plan, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(plan.String())
	expected := strings.TrimSpace(testTerraformPlanModuleVarComputedStr)
	if actual != expected {
		t.Fatalf("bad:\n%s", actual)
	}
}

func TestContextPlan_nil(t *testing.T) {
	m := testModule(t, "plan-nil")
	p := testProvider("aws")
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: &State{
			Modules: []*ModuleState{
				&ModuleState{
					Path: rootModulePath,
					Resources: map[string]*ResourceState{
						"aws_instance.foo": &ResourceState{
							Type: "aws_instance",
							Primary: &InstanceState{
								ID: "bar",
							},
						},
					},
				},
			},
		},
	})

	plan, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if len(plan.Diff.RootModule().Resources) != 0 {
		t.Fatalf("bad: %#v", plan.Diff.RootModule().Resources)
	}
}

func TestContextPlan_computed(t *testing.T) {
	m := testModule(t, "plan-computed")
	p := testProvider("aws")
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	plan, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(plan.String())
	expected := strings.TrimSpace(testTerraformPlanComputedStr)
	if actual != expected {
		t.Fatalf("bad:\n%s", actual)
	}
}

func TestContextPlan_computedList(t *testing.T) {
	m := testModule(t, "plan-computed-list")
	p := testProvider("aws")
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	plan, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(plan.String())
	expected := strings.TrimSpace(testTerraformPlanComputedListStr)
	if actual != expected {
		t.Fatalf("bad:\n%s", actual)
	}
}

func TestContextPlan_count(t *testing.T) {
	m := testModule(t, "plan-count")
	p := testProvider("aws")
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	plan, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	if len(plan.Diff.RootModule().Resources) < 6 {
		t.Fatalf("bad: %#v", plan.Diff.RootModule().Resources)
	}

	actual := strings.TrimSpace(plan.String())
	expected := strings.TrimSpace(testTerraformPlanCountStr)
	if actual != expected {
		t.Fatalf("bad:\n%s", actual)
	}
}

func TestContextPlan_countDecreaseToOne(t *testing.T) {
	m := testModule(t, "plan-count-dec")
	p := testProvider("aws")
	p.DiffFn = testDiffFn
	s := &State{
		Modules: []*ModuleState{
			&ModuleState{
				Path: rootModulePath,
				Resources: map[string]*ResourceState{
					"aws_instance.foo.0": &ResourceState{
						Type: "aws_instance",
						Primary: &InstanceState{
							ID: "bar",
							Attributes: map[string]string{
								"foo":  "foo",
								"type": "aws_instance",
							},
						},
					},
					"aws_instance.foo.1": &ResourceState{
						Type: "aws_instance",
						Primary: &InstanceState{
							ID: "bar",
						},
					},
					"aws_instance.foo.2": &ResourceState{
						Type: "aws_instance",
						Primary: &InstanceState{
							ID: "bar",
						},
					},
				},
			},
		},
	}
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: s,
	})

	plan, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(plan.String())
	expected := strings.TrimSpace(testTerraformPlanCountDecreaseStr)
	if actual != expected {
		t.Fatalf("bad:\n%s", actual)
	}
}

func TestContextPlan_countIncreaseFromNotSet(t *testing.T) {
	m := testModule(t, "plan-count-inc")
	p := testProvider("aws")
	p.DiffFn = testDiffFn
	s := &State{
		Modules: []*ModuleState{
			&ModuleState{
				Path: rootModulePath,
				Resources: map[string]*ResourceState{
					"aws_instance.foo": &ResourceState{
						Type: "aws_instance",
						Primary: &InstanceState{
							ID: "bar",
							Attributes: map[string]string{
								"foo":  "foo",
								"type": "aws_instance",
							},
						},
					},
				},
			},
		},
	}
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: s,
	})

	plan, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(plan.String())
	expected := strings.TrimSpace(testTerraformPlanCountIncreaseStr)
	if actual != expected {
		t.Fatalf("bad:\n%s", actual)
	}
}

func TestContextPlan_countIncreaseFromOne(t *testing.T) {
	m := testModule(t, "plan-count-inc")
	p := testProvider("aws")
	p.DiffFn = testDiffFn
	s := &State{
		Modules: []*ModuleState{
			&ModuleState{
				Path: rootModulePath,
				Resources: map[string]*ResourceState{
					"aws_instance.foo.0": &ResourceState{
						Type: "aws_instance",
						Primary: &InstanceState{
							ID: "bar",
							Attributes: map[string]string{
								"foo":  "foo",
								"type": "aws_instance",
							},
						},
					},
				},
			},
		},
	}
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: s,
	})

	plan, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(plan.String())
	expected := strings.TrimSpace(testTerraformPlanCountIncreaseFromOneStr)
	if actual != expected {
		t.Fatalf("bad:\n%s", actual)
	}
}

func TestContextPlan_destroy(t *testing.T) {
	m := testModule(t, "plan-destroy")
	p := testProvider("aws")
	p.DiffFn = testDiffFn
	s := &State{
		Modules: []*ModuleState{
			&ModuleState{
				Path: rootModulePath,
				Resources: map[string]*ResourceState{
					"aws_instance.one": &ResourceState{
						Type: "aws_instance",
						Primary: &InstanceState{
							ID: "bar",
						},
					},
					"aws_instance.two": &ResourceState{
						Type: "aws_instance",
						Primary: &InstanceState{
							ID: "baz",
						},
					},
				},
			},
		},
	}
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: s,
	})

	plan, err := ctx.Plan(&PlanOpts{Destroy: true})
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	if len(plan.Diff.RootModule().Resources) != 2 {
		t.Fatalf("bad: %#v", plan.Diff.RootModule().Resources)
	}

	actual := strings.TrimSpace(plan.String())
	expected := strings.TrimSpace(testTerraformPlanDestroyStr)
	if actual != expected {
		t.Fatalf("bad:\n%s", actual)
	}
}

func TestContextPlan_diffVar(t *testing.T) {
	m := testModule(t, "plan-diffvar")
	p := testProvider("aws")
	s := &State{
		Modules: []*ModuleState{
			&ModuleState{
				Path: rootModulePath,
				Resources: map[string]*ResourceState{
					"aws_instance.foo": &ResourceState{
						Primary: &InstanceState{
							ID: "bar",
							Attributes: map[string]string{
								"num": "2",
							},
						},
					},
				},
			},
		},
	}
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: s,
	})

	p.DiffFn = func(
		info *InstanceInfo,
		s *InstanceState,
		c *ResourceConfig) (*InstanceDiff, error) {
		if s.ID != "bar" {
			return testDiffFn(info, s, c)
		}

		return &InstanceDiff{
			Attributes: map[string]*ResourceAttrDiff{
				"num": &ResourceAttrDiff{
					Old: "2",
					New: "3",
				},
			},
		}, nil
	}

	plan, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(plan.String())
	expected := strings.TrimSpace(testTerraformPlanDiffVarStr)
	if actual != expected {
		t.Fatalf("actual:\n%s\n\nexpected:\n%s", actual, expected)
	}
}

func TestContextPlan_hook(t *testing.T) {
	m := testModule(t, "plan-good")
	h := new(MockHook)
	p := testProvider("aws")
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Hooks:  []Hook{h},
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	_, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	if !h.PreDiffCalled {
		t.Fatal("should be called")
	}
	if !h.PostDiffCalled {
		t.Fatal("should be called")
	}
}

func TestContextPlan_orphan(t *testing.T) {
	m := testModule(t, "plan-orphan")
	p := testProvider("aws")
	p.DiffFn = testDiffFn
	s := &State{
		Modules: []*ModuleState{
			&ModuleState{
				Path: rootModulePath,
				Resources: map[string]*ResourceState{
					"aws_instance.baz": &ResourceState{
						Type: "aws_instance",
						Primary: &InstanceState{
							ID: "bar",
						},
					},
				},
			},
		},
	}
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: s,
	})

	plan, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(plan.String())
	expected := strings.TrimSpace(testTerraformPlanOrphanStr)
	if actual != expected {
		t.Fatalf("bad:\n%s", actual)
	}
}

func TestContextPlan_state(t *testing.T) {
	m := testModule(t, "plan-good")
	p := testProvider("aws")
	p.DiffFn = testDiffFn
	s := &State{
		Modules: []*ModuleState{
			&ModuleState{
				Path: rootModulePath,
				Resources: map[string]*ResourceState{
					"aws_instance.foo": &ResourceState{
						Primary: &InstanceState{
							ID: "bar",
						},
					},
				},
			},
		},
	}
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: s,
	})

	plan, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	if len(plan.Diff.RootModule().Resources) < 2 {
		t.Fatalf("bad: %#v", plan.Diff.RootModule().Resources)
	}

	actual := strings.TrimSpace(plan.String())
	expected := strings.TrimSpace(testTerraformPlanStateStr)
	if actual != expected {
		t.Fatalf("bad:\n%s\n\nexpected:\n\n%s", actual, expected)
	}
}

func TestContextPlan_taint(t *testing.T) {
	m := testModule(t, "plan-taint")
	p := testProvider("aws")
	p.DiffFn = testDiffFn
	s := &State{
		Modules: []*ModuleState{
			&ModuleState{
				Path: rootModulePath,
				Resources: map[string]*ResourceState{
					"aws_instance.foo": &ResourceState{
						Type: "aws_instance",
						Primary: &InstanceState{
							ID:         "bar",
							Attributes: map[string]string{"num": "2"},
						},
					},
					"aws_instance.bar": &ResourceState{
						Type: "aws_instance",
						Tainted: []*InstanceState{
							&InstanceState{
								ID: "baz",
							},
						},
					},
				},
			},
		},
	}
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: s,
	})

	plan, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(plan.String())
	expected := strings.TrimSpace(testTerraformPlanTaintStr)
	if actual != expected {
		t.Fatalf("bad:\n%s", actual)
	}
}

func TestContextPlan_multiple_taint(t *testing.T) {
	m := testModule(t, "plan-taint")
	p := testProvider("aws")
	p.DiffFn = testDiffFn
	s := &State{
		Modules: []*ModuleState{
			&ModuleState{
				Path: rootModulePath,
				Resources: map[string]*ResourceState{
					"aws_instance.foo": &ResourceState{
						Type: "aws_instance",
						Primary: &InstanceState{
							ID:         "bar",
							Attributes: map[string]string{"num": "2"},
						},
					},
					"aws_instance.bar": &ResourceState{
						Type: "aws_instance",
						Tainted: []*InstanceState{
							&InstanceState{
								ID: "baz",
							},
							&InstanceState{
								ID: "zip",
							},
						},
					},
				},
			},
		},
	}
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: s,
	})

	plan, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(plan.String())
	expected := strings.TrimSpace(testTerraformPlanMultipleTaintStr)
	if actual != expected {
		t.Fatalf("bad:\n%s", actual)
	}
}

func TestContextPlan_varMultiCountOne(t *testing.T) {
	m := testModule(t, "plan-var-multi-count-one")
	p := testProvider("aws")
	p.DiffFn = testDiffFn
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
	})

	plan, err := ctx.Plan(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(plan.String())
	expected := strings.TrimSpace(testTerraformPlanVarMultiCountOneStr)
	if actual != expected {
		t.Fatalf("bad:\n%s", actual)
	}
}

func TestContextRefresh(t *testing.T) {
	p := testProvider("aws")
	m := testModule(t, "refresh-basic")
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: &State{
			Modules: []*ModuleState{
				&ModuleState{
					Path: rootModulePath,
					Resources: map[string]*ResourceState{
						"aws_instance.web": &ResourceState{
							Type: "aws_instance",
							Primary: &InstanceState{
								ID: "foo",
							},
						},
					},
				},
			},
		},
	})

	p.RefreshFn = nil
	p.RefreshReturn = &InstanceState{
		ID: "foo",
	}

	s, err := ctx.Refresh()
	mod := s.RootModule()
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if !p.RefreshCalled {
		t.Fatal("refresh should be called")
	}
	if p.RefreshState.ID != "foo" {
		t.Fatalf("bad: %#v", p.RefreshState)
	}
	if !reflect.DeepEqual(mod.Resources["aws_instance.web"].Primary, p.RefreshReturn) {
		t.Fatalf("bad: %#v %#v", mod.Resources["aws_instance.web"], p.RefreshReturn)
	}

	for _, r := range mod.Resources {
		if r.Type == "" {
			t.Fatalf("no type: %#v", r)
		}
	}
}

func TestContextRefresh_delete(t *testing.T) {
	p := testProvider("aws")
	m := testModule(t, "refresh-basic")
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: &State{
			Modules: []*ModuleState{
				&ModuleState{
					Path: rootModulePath,
					Resources: map[string]*ResourceState{
						"aws_instance.web": &ResourceState{
							Type: "aws_instance",
							Primary: &InstanceState{
								ID: "foo",
							},
						},
					},
				},
			},
		},
	})

	p.RefreshFn = nil
	p.RefreshReturn = nil

	s, err := ctx.Refresh()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	mod := s.RootModule()
	if len(mod.Resources) > 0 {
		t.Fatal("resources should be empty")
	}
}

func TestContextRefresh_ignoreUncreated(t *testing.T) {
	p := testProvider("aws")
	m := testModule(t, "refresh-basic")
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: nil,
	})

	p.RefreshFn = nil
	p.RefreshReturn = &InstanceState{
		ID: "foo",
	}

	_, err := ctx.Refresh()
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if p.RefreshCalled {
		t.Fatal("refresh should not be called")
	}
}

func TestContextRefresh_hook(t *testing.T) {
	h := new(MockHook)
	p := testProvider("aws")
	m := testModule(t, "refresh-basic")
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Hooks:  []Hook{h},
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: &State{
			Modules: []*ModuleState{
				&ModuleState{
					Path: rootModulePath,
					Resources: map[string]*ResourceState{
						"aws_instance.web": &ResourceState{
							Type: "aws_instance",
							Primary: &InstanceState{
								ID: "foo",
							},
						},
					},
				},
			},
		},
	})

	if _, err := ctx.Refresh(); err != nil {
		t.Fatalf("err: %s", err)
	}
	if !h.PreRefreshCalled {
		t.Fatal("should be called")
	}
	/*
		TODO(mitchcellh): remove when we add InstanceInfo param
		if h.PreRefreshState.Type != "aws_instance" {
			t.Fatalf("bad: %#v", h.PreRefreshState)
		}
	*/
	if !h.PostRefreshCalled {
		t.Fatal("should be called")
	}
	/*
		TODO(mitchcellh): remove when we add InstanceInfo param
		if h.PostRefreshState.Type != "aws_instance" {
			t.Fatalf("bad: %#v", h.PostRefreshState)
		}
	*/
}

func TestContextRefresh_modules(t *testing.T) {
	p := testProvider("aws")
	m := testModule(t, "refresh-modules")
	state := &State{
		Modules: []*ModuleState{
			&ModuleState{
				Path: rootModulePath,
				Resources: map[string]*ResourceState{
					"aws_instance.web": &ResourceState{
						Type: "aws_instance",
						Tainted: []*InstanceState{
							&InstanceState{
								ID: "bar",
							},
						},
					},
				},
			},

			&ModuleState{
				Path: []string{"root", "child"},
				Resources: map[string]*ResourceState{
					"aws_instance.web": &ResourceState{
						Type: "aws_instance",
						Primary: &InstanceState{
							ID: "baz",
						},
					},
				},
			},
		},
	}
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: state,
	})

	p.RefreshFn = func(info *InstanceInfo, s *InstanceState) (*InstanceState, error) {
		if s.ID != "baz" {
			return s, nil
		}

		s.ID = "new"
		return s, nil
	}

	s, err := ctx.Refresh()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(s.String())
	expected := strings.TrimSpace(testContextRefreshModuleStr)
	if actual != expected {
		t.Fatalf("bad:\n\n%s\n\n%s", actual, expected)
	}
}

func TestContextRefresh_state(t *testing.T) {
	p := testProvider("aws")
	m := testModule(t, "refresh-basic")
	state := &State{
		Modules: []*ModuleState{
			&ModuleState{
				Path: rootModulePath,
				Resources: map[string]*ResourceState{
					"aws_instance.web": &ResourceState{
						Primary: &InstanceState{
							ID: "bar",
						},
					},
				},
			},
		},
	}
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: state,
	})

	p.RefreshFn = nil
	p.RefreshReturn = &InstanceState{
		ID: "foo",
	}

	s, err := ctx.Refresh()
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	originalMod := state.RootModule()
	mod := s.RootModule()
	if !p.RefreshCalled {
		t.Fatal("refresh should be called")
	}
	if !reflect.DeepEqual(p.RefreshState, originalMod.Resources["aws_instance.web"].Primary) {
		t.Fatalf("bad: %#v %#v", p.RefreshState, originalMod.Resources["aws_instance.web"].Primary)
	}
	if !reflect.DeepEqual(mod.Resources["aws_instance.web"].Primary, p.RefreshReturn) {
		t.Fatalf("bad: %#v", mod.Resources)
	}
}

func TestContextRefresh_tainted(t *testing.T) {
	p := testProvider("aws")
	m := testModule(t, "refresh-basic")
	state := &State{
		Modules: []*ModuleState{
			&ModuleState{
				Path: rootModulePath,
				Resources: map[string]*ResourceState{
					"aws_instance.web": &ResourceState{
						Type: "aws_instance",
						Tainted: []*InstanceState{
							&InstanceState{
								ID: "bar",
							},
						},
					},
				},
			},
		},
	}
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: state,
	})

	p.RefreshFn = nil
	p.RefreshReturn = &InstanceState{
		ID: "foo",
	}

	s, err := ctx.Refresh()
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if !p.RefreshCalled {
		t.Fatal("refresh should be called")
	}

	actual := strings.TrimSpace(s.String())
	expected := strings.TrimSpace(testContextRefreshTaintedStr)
	if actual != expected {
		t.Fatalf("bad:\n\n%s\n\n%s", actual, expected)
	}
}

func TestContextRefresh_vars(t *testing.T) {
	p := testProvider("aws")
	m := testModule(t, "refresh-vars")
	ctx := testContext(t, &ContextOpts{
		Module: m,
		Providers: map[string]ResourceProviderFactory{
			"aws": testProviderFuncFixed(p),
		},
		State: &State{

			Modules: []*ModuleState{
				&ModuleState{
					Path: rootModulePath,
					Resources: map[string]*ResourceState{
						"aws_instance.web": &ResourceState{
							Type: "aws_instance",
							Primary: &InstanceState{
								ID: "foo",
							},
						},
					},
				},
			},
		},
	})

	p.RefreshFn = nil
	p.RefreshReturn = &InstanceState{
		ID: "foo",
	}

	s, err := ctx.Refresh()
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	mod := s.RootModule()
	if !p.RefreshCalled {
		t.Fatal("refresh should be called")
	}
	if p.RefreshState.ID != "foo" {
		t.Fatalf("bad: %#v", p.RefreshState)
	}
	if !reflect.DeepEqual(mod.Resources["aws_instance.web"].Primary, p.RefreshReturn) {
		t.Fatalf("bad: %#v", mod.Resources["aws_instance.web"])
	}

	for _, r := range mod.Resources {
		if r.Type == "" {
			t.Fatalf("no type: %#v", r)
		}
	}
}

func testContext(t *testing.T, opts *ContextOpts) *Context {
	return NewContext(opts)
}

func testApplyFn(
	info *InstanceInfo,
	s *InstanceState,
	d *InstanceDiff) (*InstanceState, error) {
	if d.Destroy {
		return nil, nil
	}

	id := "foo"
	if idAttr, ok := d.Attributes["id"]; ok && !idAttr.NewComputed {
		id = idAttr.New
	}

	result := &InstanceState{
		ID: id,
	}

	if d != nil {
		result = result.MergeDiff(d)
	}
	return result, nil
}

func testDiffFn(
	info *InstanceInfo,
	s *InstanceState,
	c *ResourceConfig) (*InstanceDiff, error) {
	var diff InstanceDiff
	diff.Attributes = make(map[string]*ResourceAttrDiff)

	for k, v := range c.Raw {
		if _, ok := v.(string); !ok {
			continue
		}

		if k == "nil" {
			return nil, nil
		}

		// This key is used for other purposes
		if k == "compute_value" {
			continue
		}

		if k == "compute" {
			attrDiff := &ResourceAttrDiff{
				Old:         "",
				New:         "",
				NewComputed: true,
			}

			if cv, ok := c.Config["compute_value"]; ok {
				if cv.(string) == "1" {
					attrDiff.NewComputed = false
					attrDiff.New = fmt.Sprintf("computed_%s", v.(string))
				}
			}

			diff.Attributes[v.(string)] = attrDiff
			continue
		}

		// If this key is not computed, then look it up in the
		// cleaned config.
		found := false
		for _, ck := range c.ComputedKeys {
			if ck == k {
				found = true
				break
			}
		}
		if !found {
			v = c.Config[k]
		}

		attrDiff := &ResourceAttrDiff{
			Old: "",
			New: v.(string),
		}

		diff.Attributes[k] = attrDiff
	}

	for _, k := range c.ComputedKeys {
		diff.Attributes[k] = &ResourceAttrDiff{
			Old:         "",
			NewComputed: true,
		}
	}

	for k, v := range diff.Attributes {
		if v.NewComputed {
			continue
		}

		old, ok := s.Attributes[k]
		if !ok {
			continue
		}
		if old == v.New {
			delete(diff.Attributes, k)
		}
	}

	if !diff.Empty() {
		diff.Attributes["type"] = &ResourceAttrDiff{
			Old: "",
			New: info.Type,
		}
	}

	return &diff, nil
}

func testProvider(prefix string) *MockResourceProvider {
	p := new(MockResourceProvider)
	p.RefreshFn = func(info *InstanceInfo, s *InstanceState) (*InstanceState, error) {
		return s, nil
	}
	p.ResourcesReturn = []ResourceType{
		ResourceType{
			Name: fmt.Sprintf("%s_instance", prefix),
		},
	}

	return p
}

func testProvisioner() *MockResourceProvisioner {
	p := new(MockResourceProvisioner)
	return p
}

const testContextGraph = `
root: root
aws_instance.bar
  aws_instance.bar -> provider.aws
aws_instance.foo
  aws_instance.foo -> provider.aws
provider.aws
root
  root -> aws_instance.bar
  root -> aws_instance.foo
`

const testContextRefreshModuleStr = `
aws_instance.web: (1 tainted)
  ID = <not created>
  Tainted ID 1 = bar

module.child:
  aws_instance.web:
    ID = new
`

const testContextRefreshTaintedStr = `
aws_instance.web: (1 tainted)
  ID = <not created>
  Tainted ID 1 = foo
`