Add TestStep flag to opt out of config modification

Author: bbasata

helper/resource/importstate/import_block_in_config_directory_test.go

@@ -35,10 +35,40 @@ func TestImportBlock_InConfigDirectory(t *testing.T) {
 				ConfigDirectory: config.StaticDirectory(`testdata/1`),
 			},
 			{
-				ResourceName:    "examplecloud_container.test",
-				ImportState:     true,
-				ImportStateKind: r.ImportBlockWithID,
-				ConfigDirectory: config.StaticDirectory(`testdata/2`),
+				ResourceName:              "examplecloud_container.test",
+				ImportState:               true,
+				ImportStateKind:           r.ImportBlockWithID,
+				ImportStateReadOnlyConfig: true, // TODO: naming
+				ConfigDirectory:           config.StaticDirectory(`testdata/2`),
+			},
+		},
+	})
+}
+
+func TestImportBlock_InConfigDirectory_Writeable(t *testing.T) {
+	t.Parallel()
+
+	r.UnitTest(t, r.TestCase{
+		TerraformVersionChecks: []tfversion.TerraformVersionCheck{
+			tfversion.SkipBelow(tfversion.Version1_5_0), // ImportBlockWithID requires Terraform 1.5.0 or later
+		},
+		ProtoV6ProviderFactories: map[string]func() (tfprotov6.ProviderServer, error){
+			"examplecloud": providerserver.NewProviderServer(testprovider.Provider{
+				Resources: map[string]testprovider.Resource{
+					"examplecloud_container": examplecloudResource(),
+				},
+			}),
+		},
+		Steps: []r.TestStep{
+			{
+				ConfigDirectory: config.StaticDirectory(`testdata/1`),
+			},
+			{
+				ResourceName:              "examplecloud_container.test",
+				ImportState:               true,
+				ImportStateKind:           r.ImportBlockWithID,
+				ImportStateReadOnlyConfig: false,
+				ConfigDirectory:           config.StaticDirectory(`testdata/helper/writeable-config-directory`),
 			},
 		},
 	})

helper/resource/testing.go

@@ -666,6 +666,10 @@ type TestStep struct {
 
 	ImportStateKind ImportStateKind
 
+	// ImportStateReadOnlyConfig indicates that the test framework should not
+	// modify ConfigFile or ConfigDirectory inputs to the test step.
+	ImportStateReadOnlyConfig bool
+
 	// ImportStateId is the ID to perform an ImportState operation with.
 	// This is optional. If it isn't set, then the resource ID is automatically
 	// determined by inspecting the state for ResourceName's ID.