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* @license
* Copyright 2026 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { describe, it, expect } from 'vitest';
import { renderWithProviders } from '../../../test-utils/render.js';
import { TabHeader, type Tab } from './TabHeader.js';
const MOCK_TABS: Tab[] = [
{ key: '0', header: 'Tab 1' },
{ key: '1', header: 'Tab 2' },
{ key: '2', header: 'Tab 3' },
];
describe('TabHeader', () => {
describe('rendering', () => {
it('renders null for single tab', async () => {
const { lastFrame, unmount } = await renderWithProviders(
<TabHeader
tabs={[{ key: '0', header: 'Only Tab' }]}
currentIndex={0}
/>,
);
expect(lastFrame({ allowEmpty: true })).toBe('');
unmount();
});
it('renders all tab headers', async () => {
const { lastFrame, unmount } = await renderWithProviders(
<TabHeader tabs={MOCK_TABS} currentIndex={0} />,
);
const frame = lastFrame();
expect(frame).toContain('Tab 1');
expect(frame).toContain('Tab 2');
expect(frame).toContain('Tab 3');
expect(frame).toMatchSnapshot();
unmount();
});
it('renders separators between tabs', async () => {
const { lastFrame, unmount } = await renderWithProviders(
<TabHeader tabs={MOCK_TABS} currentIndex={0} />,
);
const frame = lastFrame();
// Should have 2 separators for 3 tabs
const separatorCount = (frame?.match(/│/g) || []).length;
expect(separatorCount).toBe(2);
expect(frame).toMatchSnapshot();
unmount();
});
});
describe('arrows', () => {
it('shows arrows by default', async () => {
const { lastFrame, unmount } = await renderWithProviders(
<TabHeader tabs={MOCK_TABS} currentIndex={0} />,
);
const frame = lastFrame();
expect(frame).toContain('←');
expect(frame).toContain('→');
expect(frame).toMatchSnapshot();
unmount();
});
it('hides arrows when showArrows is false', async () => {
const { lastFrame, unmount } = await renderWithProviders(
<TabHeader tabs={MOCK_TABS} currentIndex={0} showArrows={false} />,
);
const frame = lastFrame();
expect(frame).not.toContain('←');
expect(frame).not.toContain('→');
expect(frame).toMatchSnapshot();
unmount();
});
});
describe('status icons', () => {
it('shows status icons by default', async () => {
const { lastFrame, unmount } = await renderWithProviders(
<TabHeader tabs={MOCK_TABS} currentIndex={0} />,
);
const frame = lastFrame();
// Default uncompleted icon is □
expect(frame).toContain('□');
expect(frame).toMatchSnapshot();
unmount();
});
it('hides status icons when showStatusIcons is false', async () => {
const { lastFrame, unmount } = await renderWithProviders(
<TabHeader tabs={MOCK_TABS} currentIndex={0} showStatusIcons={false} />,
);
const frame = lastFrame();
expect(frame).not.toContain('□');
expect(frame).not.toContain('✓');
expect(frame).toMatchSnapshot();
unmount();
});
it('shows checkmark for completed tabs', async () => {
const { lastFrame, unmount } = await renderWithProviders(
<TabHeader
tabs={MOCK_TABS}
currentIndex={0}
completedIndices={new Set([0, 2])}
/>,
);
const frame = lastFrame();
// Should have 2 checkmarks and 1 box
const checkmarkCount = (frame?.match(/✓/g) || []).length;
const boxCount = (frame?.match(/□/g) || []).length;
expect(checkmarkCount).toBe(2);
expect(boxCount).toBe(1);
expect(frame).toMatchSnapshot();
unmount();
});
it('shows special icon for special tabs', async () => {
const tabsWithSpecial: Tab[] = [
{ key: '0', header: 'Tab 1' },
{ key: '1', header: 'Review', isSpecial: true },
];
const { lastFrame, unmount } = await renderWithProviders(
<TabHeader tabs={tabsWithSpecial} currentIndex={0} />,
);
const frame = lastFrame();
// Special tab shows ≡ icon
expect(frame).toContain('≡');
expect(frame).toMatchSnapshot();
unmount();
});
it('uses tab statusIcon when provided', async () => {
const tabsWithCustomIcon: Tab[] = [
{ key: '0', header: 'Tab 1', statusIcon: '★' },
{ key: '1', header: 'Tab 2' },
];
const { lastFrame, unmount } = await renderWithProviders(
<TabHeader tabs={tabsWithCustomIcon} currentIndex={0} />,
);
const frame = lastFrame();
expect(frame).toContain('★');
expect(frame).toMatchSnapshot();
unmount();
});
it('uses custom renderStatusIcon when provided', async () => {
const renderStatusIcon = () => '•';
const { lastFrame, unmount } = await renderWithProviders(
<TabHeader
tabs={MOCK_TABS}
currentIndex={0}
renderStatusIcon={renderStatusIcon}
/>,
);
const frame = lastFrame();
const bulletCount = (frame?.match(/•/g) || []).length;
expect(bulletCount).toBe(3);
expect(frame).toMatchSnapshot();
unmount();
});
it('truncates long headers when not selected', async () => {
const longTabs: Tab[] = [
{ key: '0', header: 'ThisIsAVeryLongHeaderThatShouldBeTruncated' },
{ key: '1', header: 'AnotherVeryLongHeader' },
];
const { lastFrame, unmount } = await renderWithProviders(
<TabHeader tabs={longTabs} currentIndex={0} />,
);
const frame = lastFrame();
// Current tab (index 0) should NOT be truncated
expect(frame).toContain('ThisIsAVeryLongHeaderThatShouldBeTruncated');
// Inactive tab (index 1) SHOULD be truncated to 16 chars (15 chars + …)
const expectedTruncated = 'AnotherVeryLong…';
expect(frame).toContain(expectedTruncated);
expect(frame).not.toContain('AnotherVeryLongHeader');
unmount();
});
it('falls back to default when renderStatusIcon returns undefined', async () => {
const renderStatusIcon = () => undefined;
const { lastFrame, unmount } = await renderWithProviders(
<TabHeader
tabs={MOCK_TABS}
currentIndex={0}
renderStatusIcon={renderStatusIcon}
/>,
);
const frame = lastFrame();
expect(frame).toContain('□');
expect(frame).toMatchSnapshot();
unmount();
});
});
});
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