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* @license
* Copyright 2026 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { describe, it, expect, vi, beforeEach } from 'vitest';
import {
injectInputBlocker,
removeInputBlocker,
suspendInputBlocker,
resumeInputBlocker,
} from './inputBlocker.js';
import type { BrowserManager } from './browserManager.js';
describe('inputBlocker', () => {
let mockBrowserManager: BrowserManager;
beforeEach(() => {
mockBrowserManager = {
callTool: vi.fn().mockResolvedValue({
content: [{ type: 'text', text: 'Script ran on page and returned:' }],
}),
} as unknown as BrowserManager;
});
describe('injectInputBlocker', () => {
it('should call evaluate_script with correct function parameter', async () => {
await injectInputBlocker(mockBrowserManager);
expect(mockBrowserManager.callTool).toHaveBeenCalledWith(
'evaluate_script',
{
function: expect.stringContaining('__gemini_input_blocker'),
},
undefined,
true,
);
});
it('should pass a function declaration, not an IIFE', async () => {
await injectInputBlocker(mockBrowserManager);
const call = vi.mocked(mockBrowserManager.callTool).mock.calls[0];
const args = call[1] as { function: string };
// Must start with "() =>" — chrome-devtools-mcp requires a function declaration
expect(args.function.trimStart()).toMatch(/^\(\)\s*=>/);
// Must NOT contain an IIFE invocation at the end
expect(args.function.trimEnd()).not.toMatch(/\}\)\(\)\s*;?\s*$/);
});
it('should use "function" parameter name, not "code"', async () => {
await injectInputBlocker(mockBrowserManager);
const call = vi.mocked(mockBrowserManager.callTool).mock.calls[0];
const args = call[1];
expect(args).toHaveProperty('function');
expect(args).not.toHaveProperty('code');
expect(args).not.toHaveProperty('expression');
});
it('should include the informational banner text', async () => {
await injectInputBlocker(mockBrowserManager);
const call = vi.mocked(mockBrowserManager.callTool).mock.calls[0];
const args = call[1] as { function: string };
expect(args.function).toContain('Gemini CLI is controlling this browser');
});
it('should set aria-hidden to prevent accessibility tree pollution', async () => {
await injectInputBlocker(mockBrowserManager);
const call = vi.mocked(mockBrowserManager.callTool).mock.calls[0];
const args = call[1] as { function: string };
expect(args.function).toContain('aria-hidden');
});
it('should not throw if script execution fails', async () => {
mockBrowserManager.callTool = vi
.fn()
.mockRejectedValue(new Error('Script failed'));
await expect(
injectInputBlocker(mockBrowserManager),
).resolves.toBeUndefined();
});
it('should be safe to call multiple times (idempotent injection)', async () => {
await injectInputBlocker(mockBrowserManager);
await injectInputBlocker(mockBrowserManager);
expect(mockBrowserManager.callTool).toHaveBeenCalledTimes(2);
expect(mockBrowserManager.callTool).toHaveBeenNthCalledWith(
1,
'evaluate_script',
expect.objectContaining({
function: expect.stringContaining('__gemini_input_blocker'),
}),
undefined,
true,
);
expect(mockBrowserManager.callTool).toHaveBeenNthCalledWith(
2,
'evaluate_script',
expect.objectContaining({
function: expect.stringContaining('__gemini_input_blocker'),
}),
undefined,
true,
);
});
});
describe('removeInputBlocker', () => {
it('should call evaluate_script with function to remove blocker', async () => {
await removeInputBlocker(mockBrowserManager);
expect(mockBrowserManager.callTool).toHaveBeenCalledWith(
'evaluate_script',
{
function: expect.stringContaining('__gemini_input_blocker'),
},
undefined,
true,
);
});
it('should use "function" parameter name for removal too', async () => {
await removeInputBlocker(mockBrowserManager);
const call = vi.mocked(mockBrowserManager.callTool).mock.calls[0];
const args = call[1];
expect(args).toHaveProperty('function');
expect(args).not.toHaveProperty('code');
});
it('should not throw if removal fails', async () => {
mockBrowserManager.callTool = vi
.fn()
.mockRejectedValue(new Error('Removal failed'));
await expect(
removeInputBlocker(mockBrowserManager),
).resolves.toBeUndefined();
});
});
describe('suspendInputBlocker and resumeInputBlocker', () => {
it('should not throw when blocker element is missing', async () => {
// Simulate evaluate_script resolving successfully even if the DOM element is absent.
mockBrowserManager.callTool = vi.fn().mockResolvedValue({
content: [{ type: 'text', text: 'Script ran on page and returned:' }],
});
await expect(
suspendInputBlocker(mockBrowserManager),
).resolves.toBeUndefined();
await expect(
resumeInputBlocker(mockBrowserManager),
).resolves.toBeUndefined();
expect(mockBrowserManager.callTool).toHaveBeenCalledTimes(2);
expect(mockBrowserManager.callTool).toHaveBeenNthCalledWith(
1,
'evaluate_script',
expect.objectContaining({
function: expect.stringContaining('__gemini_input_blocker'),
}),
undefined,
true,
);
expect(mockBrowserManager.callTool).toHaveBeenNthCalledWith(
2,
'evaluate_script',
expect.objectContaining({
function: expect.stringContaining('__gemini_input_blocker'),
}),
undefined,
true,
);
});
});
});
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