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* @license
* Copyright 2026 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { describe, it, expect, vi, beforeEach } from 'vitest';
import { createAnalyzeScreenshotTool } from './analyzeScreenshot.js';
import type { BrowserManager, McpToolCallResult } from './browserManager.js';
import type { Config } from '../../config/config.js';
import type { MessageBus } from '../../confirmation-bus/message-bus.js';
import { Environment } from '@google/genai';
const mockMessageBus = {
waitForConfirmation: vi.fn().mockResolvedValue({ approved: true }),
} as unknown as MessageBus;
function createMockBrowserManager(
callToolResult?: McpToolCallResult,
): BrowserManager {
return {
callTool: vi.fn().mockResolvedValue(
callToolResult ?? {
content: [
{ type: 'text', text: 'Screenshot captured' },
{
type: 'image',
data: 'base64encodeddata',
mimeType: 'image/png',
},
],
},
),
} as unknown as BrowserManager;
}
function createMockConfig(
generateContentResult?: unknown,
generateContentError?: Error,
modelName: string = 'gemini-2.5-computer-use-preview-10-2025',
): Config {
const generateContent = generateContentError
? vi.fn().mockRejectedValue(generateContentError)
: vi.fn().mockResolvedValue(
generateContentResult ?? {
candidates: [
{
content: {
parts: [
{
text: 'The blue submit button is at coordinates (250, 400).',
},
],
},
},
],
},
);
return {
getBrowserAgentConfig: vi.fn().mockReturnValue({
customConfig: { visualModel: modelName },
}),
getContentGenerator: vi.fn().mockReturnValue({
generateContent,
}),
} as unknown as Config;
}
describe('analyzeScreenshot', () => {
beforeEach(() => {
vi.clearAllMocks();
});
describe('createAnalyzeScreenshotTool', () => {
it('creates a tool with the correct name and schema', () => {
const browserManager = createMockBrowserManager();
const config = createMockConfig();
const tool = createAnalyzeScreenshotTool(
browserManager,
config,
mockMessageBus,
);
expect(tool.name).toBe('analyze_screenshot');
});
});
describe('AnalyzeScreenshotInvocation', () => {
it('captures a screenshot and returns visual analysis', async () => {
const browserManager = createMockBrowserManager();
const config = createMockConfig();
const tool = createAnalyzeScreenshotTool(
browserManager,
config,
mockMessageBus,
);
const invocation = tool.build({
instruction: 'Find the blue submit button',
});
const result = await invocation.execute({
abortSignal: new AbortController().signal,
});
// Verify screenshot was captured
expect(browserManager.callTool).toHaveBeenCalledWith(
'take_screenshot',
{},
);
// Verify the visual model was called
const contentGenerator = config.getContentGenerator();
expect(contentGenerator.generateContent).toHaveBeenCalledWith(
expect.objectContaining({
model: 'gemini-2.5-computer-use-preview-10-2025',
config: expect.objectContaining({
tools: [
{
computerUse: {
environment: Environment.ENVIRONMENT_BROWSER,
excludedPredefinedFunctions: [
'open_web_browser',
'click_at',
'key_combination',
'drag_and_drop',
],
},
},
],
}),
contents: expect.arrayContaining([
expect.objectContaining({
role: 'user',
parts: expect.arrayContaining([
expect.objectContaining({
inlineData: {
mimeType: 'image/png',
data: 'base64encodeddata',
},
}),
]),
}),
]),
}),
'visual-analysis',
'utility_tool',
);
// Verify result
expect(result.llmContent).toContain('Visual Analysis Result');
expect(result.llmContent).toContain(
'The blue submit button is at coordinates (250, 400).',
);
expect(result.error).toBeUndefined();
});
it('omits computerUse tools for non-computer-use models', async () => {
const browserManager = createMockBrowserManager();
const config = createMockConfig(undefined, undefined, 'gemini-2.0-flash');
const tool = createAnalyzeScreenshotTool(
browserManager,
config,
mockMessageBus,
);
const invocation = tool.build({
instruction: 'Find the search bar',
});
await invocation.execute({ abortSignal: new AbortController().signal });
const contentGenerator = config.getContentGenerator();
expect(contentGenerator.generateContent).toHaveBeenCalledWith(
expect.objectContaining({
model: 'gemini-2.0-flash',
config: expect.not.objectContaining({
tools: expect.anything(),
}),
}),
'visual-analysis',
'utility_tool',
);
});
it('returns an error when screenshot capture fails (no image)', async () => {
const browserManager = createMockBrowserManager({
content: [{ type: 'text', text: 'No screenshot available' }],
});
const config = createMockConfig();
const tool = createAnalyzeScreenshotTool(
browserManager,
config,
mockMessageBus,
);
const invocation = tool.build({
instruction: 'Find the button',
});
const result = await invocation.execute({
abortSignal: new AbortController().signal,
});
expect(result.error).toBeDefined();
expect(result.llmContent).toContain('Failed to capture screenshot');
// Should NOT call the visual model
const contentGenerator = config.getContentGenerator();
expect(contentGenerator.generateContent).not.toHaveBeenCalled();
});
it('returns an error when visual model returns empty response', async () => {
const browserManager = createMockBrowserManager();
const config = createMockConfig({
candidates: [{ content: { parts: [] } }],
});
const tool = createAnalyzeScreenshotTool(
browserManager,
config,
mockMessageBus,
);
const invocation = tool.build({
instruction: 'Check the layout',
});
const result = await invocation.execute({
abortSignal: new AbortController().signal,
});
expect(result.error).toBeDefined();
expect(result.llmContent).toContain('Visual model returned no analysis');
});
it('returns a model-unavailability fallback for 404 errors', async () => {
const browserManager = createMockBrowserManager();
const config = createMockConfig(
undefined,
new Error('Model not found: 404'),
);
const tool = createAnalyzeScreenshotTool(
browserManager,
config,
mockMessageBus,
);
const invocation = tool.build({
instruction: 'Find the red error',
});
const result = await invocation.execute({
abortSignal: new AbortController().signal,
});
expect(result.error).toBeDefined();
expect(result.llmContent).toContain(
'Visual analysis model is not available',
);
});
it('returns a model-unavailability fallback for 403 errors', async () => {
const browserManager = createMockBrowserManager();
const config = createMockConfig(
undefined,
new Error('permission denied: 403'),
);
const tool = createAnalyzeScreenshotTool(
browserManager,
config,
mockMessageBus,
);
const invocation = tool.build({
instruction: 'Identify the element',
});
const result = await invocation.execute({
abortSignal: new AbortController().signal,
});
expect(result.error).toBeDefined();
expect(result.llmContent).toContain(
'Visual analysis model is not available',
);
});
it('returns a generic error for non-model errors', async () => {
const browserManager = createMockBrowserManager();
const config = createMockConfig(undefined, new Error('Network timeout'));
const tool = createAnalyzeScreenshotTool(
browserManager,
config,
mockMessageBus,
);
const invocation = tool.build({
instruction: 'Find something',
});
const result = await invocation.execute({
abortSignal: new AbortController().signal,
});
expect(result.error).toBeDefined();
expect(result.llmContent).toContain('Visual analysis failed');
expect(result.llmContent).toContain('Network timeout');
});
});
});
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