[Bug]: Renaming github_repository doesn't taint full_name attribute (#1756)

* set full_name new computed on name change & add tests

* Run go fmt ./...

---------

Co-authored-by: Keegan Campbell <me@kfcampbell.com>

Author: KenSpur

github/resource_github_repository.go

@@ -394,6 +394,7 @@ func resourceGithubRepository() *schema.Resource {
 				Description: " Set to 'true' to always suggest updating pull request branches.",
 			},
 		},
+		CustomizeDiff: customDiffFunction,
 	}
 }
 
@@ -969,3 +970,10 @@ func resourceGithubParseFullName(resourceDataLike interface {
 	}
 	return parts[0], parts[1], true
 }
+
+func customDiffFunction(diff *schema.ResourceDiff, v interface{}) error {
+	if diff.HasChange("name") {
+		diff.SetNewComputed("full_name")
+	}
+	return nil
+}

github/resource_github_repository_test.go

@@ -9,6 +9,7 @@ import (
 	"testing"
 
 	"github.com/hashicorp/terraform-plugin-sdk/helper/schema"
+	"github.com/hashicorp/terraform-plugin-sdk/terraform"
 
 	"github.com/hashicorp/terraform-plugin-sdk/helper/acctest"
 	"github.com/hashicorp/terraform-plugin-sdk/helper/resource"
@@ -105,12 +106,20 @@ func TestAccGithubRepositories(t *testing.T) {
 					"github_repository.test", "name",
 					oldName,
 				),
+				resource.ComposeTestCheckFunc(
+					testCheckResourceAttrContains("github_repository.test", "full_name",
+						oldName),
+				),
 			),
 			"after": resource.ComposeTestCheckFunc(
 				resource.TestCheckResourceAttr(
 					"github_repository.test", "name",
 					newName,
 				),
+				resource.ComposeTestCheckFunc(
+					testCheckResourceAttrContains("github_repository.test", "full_name",
+						newName),
+				),
 			),
 		}
 
@@ -1426,3 +1435,23 @@ func TestResourceGithubParseFullName(t *testing.T) {
 	_, _, ok = resourceGithubParseFullName(resourceDataLike(map[string]interface{}{"full_name": "malformed"}))
 	assert.False(t, ok)
 }
+
+func testCheckResourceAttrContains(resourceName, attributeName, substring string) resource.TestCheckFunc {
+	return func(s *terraform.State) error {
+		rs, ok := s.RootModule().Resources[resourceName]
+		if !ok {
+			return fmt.Errorf("Resource not found: %s", resourceName)
+		}
+
+		value, ok := rs.Primary.Attributes[attributeName]
+		if !ok {
+			return fmt.Errorf("Attribute not found: %s", attributeName)
+		}
+
+		if !strings.Contains(value, substring) {
+			return fmt.Errorf("Attribute '%s' does not contain '%s'", value, substring)
+		}
+
+		return nil
+	}
+}