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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { type MutableRefObject } from 'react';
import { render } from 'ink-testing-library';
import { renderHook } from '@testing-library/react';
import { act } from 'react-dom/test-utils';
import {
SessionStatsProvider,
useSessionStats,
SessionMetrics,
} from './SessionContext.js';
import { describe, it, expect, vi } from 'vitest';
import { uiTelemetryService } from '@google/gemini-cli-core';
/**
* A test harness component that uses the hook and exposes the context value
* via a mutable ref. This allows us to interact with the context's functions
* and assert against its state directly in our tests.
*/
const TestHarness = ({
contextRef,
}: {
contextRef: MutableRefObject<ReturnType<typeof useSessionStats> | undefined>;
}) => {
contextRef.current = useSessionStats();
return null;
};
describe('SessionStatsContext', () => {
it('should provide the correct initial state', () => {
const contextRef: MutableRefObject<
ReturnType<typeof useSessionStats> | undefined
> = { current: undefined };
render(
<SessionStatsProvider>
<TestHarness contextRef={contextRef} />
</SessionStatsProvider>,
);
const stats = contextRef.current?.stats;
expect(stats?.sessionStartTime).toBeInstanceOf(Date);
expect(stats?.metrics).toBeDefined();
expect(stats?.metrics.models).toEqual({});
});
it('should update metrics when the uiTelemetryService emits an update', () => {
const contextRef: MutableRefObject<
ReturnType<typeof useSessionStats> | undefined
> = { current: undefined };
render(
<SessionStatsProvider>
<TestHarness contextRef={contextRef} />
</SessionStatsProvider>,
);
const newMetrics: SessionMetrics = {
models: {
'gemini-pro': {
api: {
totalRequests: 1,
totalErrors: 0,
totalLatencyMs: 123,
},
tokens: {
prompt: 100,
candidates: 200,
total: 300,
cached: 50,
thoughts: 20,
tool: 10,
},
},
},
tools: {
totalCalls: 1,
totalSuccess: 1,
totalFail: 0,
totalDurationMs: 456,
totalDecisions: {
accept: 1,
reject: 0,
modify: 0,
},
byName: {
'test-tool': {
count: 1,
success: 1,
fail: 0,
durationMs: 456,
decisions: {
accept: 1,
reject: 0,
modify: 0,
},
},
},
},
};
act(() => {
uiTelemetryService.emit('update', {
metrics: newMetrics,
lastPromptTokenCount: 100,
});
});
const stats = contextRef.current?.stats;
expect(stats?.metrics).toEqual(newMetrics);
expect(stats?.lastPromptTokenCount).toBe(100);
});
it('should throw an error when useSessionStats is used outside of a provider', () => {
// Suppress console.error for this test since we expect an error
const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => {});
try {
// Expect renderHook itself to throw when the hook is used outside a provider
expect(() => {
renderHook(() => useSessionStats());
}).toThrow('useSessionStats must be used within a SessionStatsProvider');
} finally {
consoleSpy.mockRestore();
}
});
});
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