add: new unit test for union type display

Author: Who-is-PS

test/components/object-definition.test.ts

@@ -0,0 +1,46 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+import { expect, test, beforeAll } from 'vitest';
+import { ComponentDefinition } from '../../src/components/interfaces';
+import { buildProject } from './test-helpers';
+
+let codeEditor: ComponentDefinition;
+
+beforeAll(() => {
+  const result = buildProject('string-intersection');
+  expect(result).toHaveLength(1);
+  [codeEditor] = result;
+});
+
+test('string intersection union should be treated as primitive string type', () => {
+  const languageProp = codeEditor.properties.find(def => def.name === 'language');
+
+  // The new getPrimitiveType function should identify this as a string type
+  expect(languageProp?.type).toBe('string');
+});
+
+test('string intersection values should include "string" for custom values', () => {
+  const languageProp = codeEditor.properties.find(def => def.name === 'language');
+
+  if (languageProp?.inlineType?.type === 'union') {
+    // Should contain literal values
+    expect(languageProp.inlineType.values).toContain('javascript');
+    expect(languageProp.inlineType.values).toContain('html');
+
+    // Should contain "string" to indicate custom values are allowed
+    expect(languageProp.inlineType.values).toContain('string');
+
+    // Should not contain raw intersection syntax
+    const hasRawIntersection = languageProp.inlineType.values.some(
+      (value: string) => value.includes('string &') || value.includes('_?:')
+    );
+    expect(hasRawIntersection).toBe(false);
+  }
+});
+
+test('union type name should be preserved in inlineType', () => {
+  const languageProp = codeEditor.properties.find(def => def.name === 'language');
+
+  expect(languageProp?.inlineType?.name).toBe('CodeEditorProps.Language');
+  expect(languageProp?.inlineType?.type).toBe('union');
+});