create a new InternalProviders test

Remove the legacy InternalProviders global.

The terraform provider is the only one run internally.

command/internal_plugin.go

@@ -45,16 +45,6 @@ func (c *InternalPluginCommand) Run(args []string) int {
 	log.SetPrefix(fmt.Sprintf("%s-%s (internal) ", pluginName, pluginType))
 
 	switch pluginType {
-	case "provider":
-		pluginFunc, found := InternalProviders[pluginName]
-		if !found {
-			log.Printf("[ERROR] Could not load provider: %s", pluginName)
-			return 1
-		}
-		log.Printf("[INFO] Starting provider plugin %s", pluginName)
-		plugin.Serve(&plugin.ServeOpts{
-			ProviderFunc: pluginFunc,
-		})
 	case "provisioner":
 		pluginFunc, found := InternalProvisioners[pluginName]
 		if !found {

command/internal_plugin_list.go

@@ -14,8 +14,6 @@ import (
 	"github.com/hashicorp/terraform/plugin"
 )
 
-var InternalProviders = map[string]plugin.ProviderFunc{}
-
 var InternalProvisioners = map[string]plugin.ProvisionerFunc{
 	"chef":            chefprovisioner.Provisioner,
 	"file":            fileprovisioner.Provisioner,

command/internal_plugin_test.go

@@ -2,15 +2,26 @@ package command
 
 import "testing"
 
-// providers are all external for now
-//func TestInternalPlugin_InternalProviders(t *testing.T) {
-//    // Note this is a randomish sample and does not check for all plugins
-//    for _, name := range []string{"atlas", "consul", "docker", "template"} {
-//        if _, ok := InternalProviders[name]; !ok {
-//            t.Errorf("Expected to find %s in InternalProviders", name)
-//        }
-//    }
-//}
+func TestInternalPlugin_InternalProviders(t *testing.T) {
+	m := new(Meta)
+	providers := m.internalProviders()
+	// terraform is the only provider moved back to internal
+	for _, name := range []string{"terraform"} {
+		pf, ok := providers[name]
+		if !ok {
+			t.Errorf("Expected to find %s in InternalProviders", name)
+		}
+
+		provider, err := pf()
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if provider == nil {
+			t.Fatal("provider factory returned a nil provider")
+		}
+	}
+}
 
 func TestInternalPlugin_InternalProvisioners(t *testing.T) {
 	for _, name := range []string{"chef", "file", "local-exec", "remote-exec", "salt-masterless"} {