test: add TitleBar component tests

__mocks__/styleMock.js

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+const proxy = new Proxy({}, {
+  get: (target, prop) => prop,
+});
+
+module.exports = proxy;
+module.exports.default = proxy;

jest.config.js

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+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'jsdom',
+  moduleNameMapper: {
+    '\\.(css|less)$': '<rootDir>/__mocks__/styleMock.js',
+  },
+};

src/web/TitleBar.test.tsx

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+import { render, unmountComponentAtNode } from 'react-dom';
+import { act } from 'react-dom/test-utils';
+import TitleBar from './TitleBar';
+
+describe('TitleBar', () => {
+  let container: HTMLDivElement | null = null;
+
+  beforeEach(() => {
+    container = document.createElement('div');
+    document.body.appendChild(container);
+  });
+
+  afterEach(() => {
+    if (container) {
+      unmountComponentAtNode(container);
+      container.remove();
+      container = null;
+    }
+  });
+
+  it('renders title text', () => {
+    act(() => {
+      render(<TitleBar titleText="My Title" />, container!);
+    });
+    const wrapper = container!.firstElementChild as HTMLElement;
+    const title = wrapper.firstElementChild as HTMLElement;
+    expect(title.textContent).toBe('My Title');
+  });
+
+  it('triggers callbacks when buttons clicked', () => {
+    const onMinimize = jest.fn();
+    const onMaximize = jest.fn();
+    const onUnMaximize = jest.fn();
+    const onClose = jest.fn();
+
+    act(() => {
+      render(
+        <TitleBar
+          titleText=""
+          onMinimize={onMinimize}
+          onMaximize={onMaximize}
+          onUnMaximize={onUnMaximize}
+          onClose={onClose}
+        />, container!);
+    });
+
+    const wrapper = container!.firstElementChild as HTMLElement;
+    const buttons = wrapper.lastElementChild as HTMLElement;
+    const buttonItems = buttons.children;
+
+    act(() => {
+      (buttonItems[0] as HTMLElement).dispatchEvent(new MouseEvent('click', { bubbles: true }));
+    });
+    expect(onMinimize).toHaveBeenCalledTimes(1);
+
+    act(() => {
+      (buttonItems[1] as HTMLElement).dispatchEvent(new MouseEvent('click', { bubbles: true }));
+    });
+    expect(onMaximize).toHaveBeenCalledTimes(1);
+
+    act(() => {
+      (buttonItems[1] as HTMLElement).dispatchEvent(new MouseEvent('click', { bubbles: true }));
+    });
+    expect(onUnMaximize).toHaveBeenCalledTimes(1);
+
+    act(() => {
+      (buttonItems[2] as HTMLElement).dispatchEvent(new MouseEvent('click', { bubbles: true }));
+    });
+    expect(onClose).toHaveBeenCalledTimes(1);
+  });
+});