test(vue): add unit tests for getDisplayName utility

packages/vue/src/__tests__/utils/getDisplayName.test.ts

@@ -0,0 +1,71 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import getDisplayName from '../../utils/getDisplayName';
+
+vi.mock('../../utils/getMappedUserProfileValue', () => ({
+  default: vi.fn(),
+}));
+
+import getMappedUserProfileValue from '../../utils/getMappedUserProfileValue';
+
+const mockGet = getMappedUserProfileValue as ReturnType<typeof vi.fn>;
+
+describe('getDisplayName', () => {
+  const mergedMappings = {};
+  const user = {} as any;
+
+  beforeEach(() => {
+    mockGet.mockReset();
+  });
+
+  it('returns User when nothing is found', () => {
+    mockGet.mockReturnValue(undefined);
+    const result = getDisplayName(mergedMappings, user);
+    expect(result).toBe('User');
+  });
+
+  it('returns firstName and lastName combined', () => {
+    mockGet.mockReturnValueOnce('Jane');
+    mockGet.mockReturnValueOnce('Doe');
+    const result = getDisplayName(mergedMappings, user);
+    expect(result).toBe('Jane Doe');
+  });
+
+  it('returns username when no firstName or lastName', () => {
+    mockGet.mockReturnValueOnce(undefined);
+    mockGet.mockReturnValueOnce(undefined);
+    mockGet.mockReturnValueOnce('janedoe');
+    const result = getDisplayName(mergedMappings, user);
+    expect(result).toBe('janedoe');
+  });
+
+  it('returns email when no firstName lastName or username', () => {
+    mockGet.mockReturnValueOnce(undefined);
+    mockGet.mockReturnValueOnce(undefined);
+    mockGet.mockReturnValueOnce(undefined);
+    mockGet.mockReturnValueOnce('jane@example.com');
+    const result = getDisplayName(mergedMappings, user);
+    expect(result).toBe('jane@example.com');
+  });
+
+  it('returns value from displayAttributes when found', () => {
+    mockGet.mockReturnValueOnce('John');
+    const result = getDisplayName(mergedMappings, user, ['firstName']);
+    expect(result).toBe('John');
+  });
+  it('returns name when firstName, lastName, username, and email are missing', () => {
+    mockGet.mockReturnValueOnce(undefined); // firstName
+    mockGet.mockReturnValueOnce(undefined); // lastName
+    mockGet.mockReturnValueOnce(undefined); // username
+    mockGet.mockReturnValueOnce(undefined); // email
+    mockGet.mockReturnValueOnce('Jane Fullname'); // name
+    const result = getDisplayName(mergedMappings, user);
+    expect(result).toBe('Jane Fullname');
+  });
+
+  it('skips empty displayAttributes and uses firstName and lastName', () => {
+    mockGet.mockReturnValueOnce('Jane');
+    mockGet.mockReturnValueOnce('Doe');
+    const result = getDisplayName(mergedMappings, user, []);
+    expect(result).toBe('Jane Doe');
+  });
+});