Improve test coverage for cli/src/ui/components (#13598)

packages/cli/src/ui/components/ConsoleSummaryDisplay.test.tsx

@@ -0,0 +1,27 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { render } from '../../test-utils/render.js';
+import { ConsoleSummaryDisplay } from './ConsoleSummaryDisplay.js';
+import { describe, it, expect } from 'vitest';
+
+describe('ConsoleSummaryDisplay', () => {
+  it('renders nothing when errorCount is 0', () => {
+    const { lastFrame } = render(<ConsoleSummaryDisplay errorCount={0} />);
+    expect(lastFrame()).toBe('');
+  });
+
+  it.each([
+    [1, '1 error'],
+    [5, '5 errors'],
+  ])('renders correct message for %i errors', (count, expectedText) => {
+    const { lastFrame } = render(<ConsoleSummaryDisplay errorCount={count} />);
+    const output = lastFrame();
+    expect(output).toContain(expectedText);
+    expect(output).toContain('✖');
+    expect(output).toContain('(F12 for details)');
+  });
+});