teraform: test that count can be a variable

terraform/context_test.go

@@ -2428,6 +2428,32 @@ func TestContextPlan_count(t *testing.T) {
 	}
 }
 
+func TestContextPlan_countVar(t *testing.T) {
+	m := testModule(t, "plan-count-var")
+	p := testProvider("aws")
+	p.DiffFn = testDiffFn
+	ctx := testContext(t, &ContextOpts{
+		Module: m,
+		Providers: map[string]ResourceProviderFactory{
+			"aws": testProviderFuncFixed(p),
+		},
+		Variables: map[string]string{
+			"count": "3",
+		},
+	})
+
+	plan, err := ctx.Plan(nil)
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	actual := strings.TrimSpace(plan.String())
+	expected := strings.TrimSpace(testTerraformPlanCountVarStr)
+	if actual != expected {
+		t.Fatalf("bad:\n%s", actual)
+	}
+}
+
 func TestContextPlan_countDecreaseToOne(t *testing.T) {
 	m := testModule(t, "plan-count-dec")
 	p := testProvider("aws")

terraform/terraform_test.go

@@ -477,6 +477,27 @@ STATE:
 <no state>
 `
 
+const testTerraformPlanCountVarStr = `
+DIFF:
+
+CREATE: aws_instance.bar
+  foo:  "" => "foo,foo,foo"
+  type: "" => "aws_instance"
+CREATE: aws_instance.foo.0
+  foo:  "" => "foo"
+  type: "" => "aws_instance"
+CREATE: aws_instance.foo.1
+  foo:  "" => "foo"
+  type: "" => "aws_instance"
+CREATE: aws_instance.foo.2
+  foo:  "" => "foo"
+  type: "" => "aws_instance"
+
+STATE:
+
+<no state>
+`
+
 const testTerraformPlanCountDecreaseStr = `
 DIFF:
 

terraform/test-fixtures/plan-count-var/main.tf

@@ -0,0 +1,10 @@
+variable "count" {}
+
+resource "aws_instance" "foo" {
+    count = "${var.count}"
+    foo = "foo"
+}
+
+resource "aws_instance" "bar" {
+    foo = "${aws_instance.foo.*.foo}"
+}