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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 } from './SessionContext.js';
import { describe, it, expect, vi } from 'vitest';
import { GenerateContentResponseUsageMetadata } from '@google/genai';
// Mock data that simulates what the Gemini API would return.
const mockMetadata1: GenerateContentResponseUsageMetadata = {
promptTokenCount: 100,
candidatesTokenCount: 200,
totalTokenCount: 300,
cachedContentTokenCount: 50,
toolUsePromptTokenCount: 10,
thoughtsTokenCount: 20,
};
const mockMetadata2: GenerateContentResponseUsageMetadata = {
promptTokenCount: 10,
candidatesTokenCount: 20,
totalTokenCount: 30,
cachedContentTokenCount: 5,
toolUsePromptTokenCount: 1,
thoughtsTokenCount: 2,
};
/**
* 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?.currentTurn).toBeDefined();
expect(stats?.cumulative.turnCount).toBe(0);
expect(stats?.cumulative.totalTokenCount).toBe(0);
expect(stats?.cumulative.promptTokenCount).toBe(0);
});
it('should increment turnCount when startNewTurn is called', () => {
const contextRef: MutableRefObject<
ReturnType<typeof useSessionStats> | undefined
> = { current: undefined };
render(
<SessionStatsProvider>
<TestHarness contextRef={contextRef} />
</SessionStatsProvider>,
);
act(() => {
contextRef.current?.startNewTurn();
});
const stats = contextRef.current?.stats;
expect(stats?.currentTurn.totalTokenCount).toBe(0);
expect(stats?.cumulative.turnCount).toBe(1);
// Ensure token counts are unaffected
expect(stats?.cumulative.totalTokenCount).toBe(0);
});
it('should aggregate token usage correctly when addUsage is called', () => {
const contextRef: MutableRefObject<
ReturnType<typeof useSessionStats> | undefined
> = { current: undefined };
render(
<SessionStatsProvider>
<TestHarness contextRef={contextRef} />
</SessionStatsProvider>,
);
act(() => {
contextRef.current?.addUsage({ ...mockMetadata1, apiTimeMs: 123 });
});
const stats = contextRef.current?.stats;
// Check that token counts are updated
expect(stats?.cumulative.totalTokenCount).toBe(
mockMetadata1.totalTokenCount ?? 0,
);
expect(stats?.cumulative.promptTokenCount).toBe(
mockMetadata1.promptTokenCount ?? 0,
);
expect(stats?.cumulative.apiTimeMs).toBe(123);
// Check that turn count is NOT incremented
expect(stats?.cumulative.turnCount).toBe(0);
// Check that currentTurn is updated
expect(stats?.currentTurn?.totalTokenCount).toEqual(
mockMetadata1.totalTokenCount,
);
expect(stats?.currentTurn?.apiTimeMs).toBe(123);
});
it('should correctly track a full logical turn with multiple API calls', () => {
const contextRef: MutableRefObject<
ReturnType<typeof useSessionStats> | undefined
> = { current: undefined };
render(
<SessionStatsProvider>
<TestHarness contextRef={contextRef} />
</SessionStatsProvider>,
);
// 1. User starts a new turn
act(() => {
contextRef.current?.startNewTurn();
});
// 2. First API call (e.g., prompt with a tool request)
act(() => {
contextRef.current?.addUsage({ ...mockMetadata1, apiTimeMs: 100 });
});
// 3. Second API call (e.g., sending tool response back)
act(() => {
contextRef.current?.addUsage({ ...mockMetadata2, apiTimeMs: 50 });
});
const stats = contextRef.current?.stats;
// Turn count should only be 1
expect(stats?.cumulative.turnCount).toBe(1);
// --- Check Cumulative Stats ---
// These fields should be the SUM of both calls
expect(stats?.cumulative.totalTokenCount).toBe(300 + 30);
expect(stats?.cumulative.candidatesTokenCount).toBe(200 + 20);
expect(stats?.cumulative.thoughtsTokenCount).toBe(20 + 2);
expect(stats?.cumulative.apiTimeMs).toBe(100 + 50);
// These fields should be the SUM of both calls
expect(stats?.cumulative.promptTokenCount).toBe(100 + 10);
expect(stats?.cumulative.cachedContentTokenCount).toBe(50 + 5);
expect(stats?.cumulative.toolUsePromptTokenCount).toBe(10 + 1);
// --- Check Current Turn Stats ---
// All fields should be the SUM of both calls for the turn
expect(stats?.currentTurn.totalTokenCount).toBe(300 + 30);
expect(stats?.currentTurn.candidatesTokenCount).toBe(200 + 20);
expect(stats?.currentTurn.thoughtsTokenCount).toBe(20 + 2);
expect(stats?.currentTurn.promptTokenCount).toBe(100 + 10);
expect(stats?.currentTurn.cachedContentTokenCount).toBe(50 + 5);
expect(stats?.currentTurn.toolUsePromptTokenCount).toBe(10 + 1);
expect(stats?.currentTurn.apiTimeMs).toBe(100 + 50);
});
it('should overwrite currentResponse with each API call', () => {
const contextRef: MutableRefObject<
ReturnType<typeof useSessionStats> | undefined
> = { current: undefined };
render(
<SessionStatsProvider>
<TestHarness contextRef={contextRef} />
</SessionStatsProvider>,
);
// 1. First API call
act(() => {
contextRef.current?.addUsage({ ...mockMetadata1, apiTimeMs: 100 });
});
let stats = contextRef.current?.stats;
// currentResponse should match the first call
expect(stats?.currentResponse.totalTokenCount).toBe(300);
expect(stats?.currentResponse.apiTimeMs).toBe(100);
// 2. Second API call
act(() => {
contextRef.current?.addUsage({ ...mockMetadata2, apiTimeMs: 50 });
});
stats = contextRef.current?.stats;
// currentResponse should now match the second call
expect(stats?.currentResponse.totalTokenCount).toBe(30);
expect(stats?.currentResponse.apiTimeMs).toBe(50);
// 3. Start a new turn
act(() => {
contextRef.current?.startNewTurn();
});
stats = contextRef.current?.stats;
// currentResponse should be reset
expect(stats?.currentResponse.totalTokenCount).toBe(0);
expect(stats?.currentResponse.apiTimeMs).toBe(0);
});
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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