Add validation test to prevent regression of Update function requirement

Author: nickfloyd

github/resource_github_actions_secret_validation_test.go

@@ -0,0 +1,34 @@
+package github
+
+import (
+	"testing"
+
+	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
+)
+
+func TestResourceGithubActionsSecretValidation(t *testing.T) {
+	resource := resourceGithubActionsSecret()
+	
+	// Verify the resource has an Update function
+	if resource.Update == nil {
+		t.Fatal("github_actions_secret resource must have an Update function to handle destroy_on_drift field changes")
+	}
+	
+	// Verify destroy_on_drift field exists and is configured correctly
+	destroyOnDriftSchema, exists := resource.Schema["destroy_on_drift"]
+	if !exists {
+		t.Fatal("destroy_on_drift field should exist in schema")
+	}
+	
+	if destroyOnDriftSchema.Type != schema.TypeBool {
+		t.Error("destroy_on_drift should be TypeBool")
+	}
+	
+	if !destroyOnDriftSchema.Optional {
+		t.Error("destroy_on_drift should be Optional")
+	}
+	
+	if destroyOnDriftSchema.ForceNew {
+		t.Error("destroy_on_drift should not be ForceNew when Update function exists")
+	}
+}