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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { describe, it, expect, vi, beforeEach, type Mock } from 'vitest';
import type {
Counter,
Meter,
Attributes,
Context,
Histogram,
} from '@opentelemetry/api';
import { Config } from '../config/config.js';
import { FileOperation } from './metrics.js';
const mockCounterAddFn: Mock<
(value: number, attributes?: Attributes, context?: Context) => void
> = vi.fn();
const mockHistogramRecordFn: Mock<
(value: number, attributes?: Attributes, context?: Context) => void
> = vi.fn();
const mockCreateCounterFn: Mock<(name: string, options?: unknown) => Counter> =
vi.fn();
const mockCreateHistogramFn: Mock<
(name: string, options?: unknown) => Histogram
> = vi.fn();
const mockCounterInstance = {
add: mockCounterAddFn,
} as unknown as Counter;
const mockHistogramInstance = {
record: mockHistogramRecordFn,
} as unknown as Histogram;
const mockMeterInstance = {
createCounter: mockCreateCounterFn.mockReturnValue(mockCounterInstance),
createHistogram: mockCreateHistogramFn.mockReturnValue(mockHistogramInstance),
} as unknown as Meter;
function originalOtelMockFactory() {
return {
metrics: {
getMeter: vi.fn(),
},
ValueType: {
INT: 1,
},
};
}
vi.mock('@opentelemetry/api', originalOtelMockFactory);
describe('Telemetry Metrics', () => {
let initializeMetricsModule: typeof import('./metrics.js').initializeMetrics;
let recordTokenUsageMetricsModule: typeof import('./metrics.js').recordTokenUsageMetrics;
let recordFileOperationMetricModule: typeof import('./metrics.js').recordFileOperationMetric;
beforeEach(async () => {
vi.resetModules();
vi.doMock('@opentelemetry/api', () => {
const actualApi = originalOtelMockFactory();
(actualApi.metrics.getMeter as Mock).mockReturnValue(mockMeterInstance);
return actualApi;
});
const metricsJsModule = await import('./metrics.js');
initializeMetricsModule = metricsJsModule.initializeMetrics;
recordTokenUsageMetricsModule = metricsJsModule.recordTokenUsageMetrics;
recordFileOperationMetricModule = metricsJsModule.recordFileOperationMetric;
const otelApiModule = await import('@opentelemetry/api');
mockCounterAddFn.mockClear();
mockCreateCounterFn.mockClear();
mockCreateHistogramFn.mockClear();
mockHistogramRecordFn.mockClear();
(otelApiModule.metrics.getMeter as Mock).mockClear();
(otelApiModule.metrics.getMeter as Mock).mockReturnValue(mockMeterInstance);
mockCreateCounterFn.mockReturnValue(mockCounterInstance);
mockCreateHistogramFn.mockReturnValue(mockHistogramInstance);
});
describe('recordTokenUsageMetrics', () => {
const mockConfig = {
getSessionId: () => 'test-session-id',
} as unknown as Config;
it('should not record metrics if not initialized', () => {
recordTokenUsageMetricsModule(mockConfig, 'gemini-pro', 100, 'input');
expect(mockCounterAddFn).not.toHaveBeenCalled();
});
it('should record token usage with the correct attributes', () => {
initializeMetricsModule(mockConfig);
recordTokenUsageMetricsModule(mockConfig, 'gemini-pro', 100, 'input');
expect(mockCounterAddFn).toHaveBeenCalledTimes(2);
expect(mockCounterAddFn).toHaveBeenNthCalledWith(1, 1, {
'session.id': 'test-session-id',
});
expect(mockCounterAddFn).toHaveBeenNthCalledWith(2, 100, {
'session.id': 'test-session-id',
model: 'gemini-pro',
type: 'input',
});
});
it('should record token usage for different types', () => {
initializeMetricsModule(mockConfig);
mockCounterAddFn.mockClear();
recordTokenUsageMetricsModule(mockConfig, 'gemini-pro', 50, 'output');
expect(mockCounterAddFn).toHaveBeenCalledWith(50, {
'session.id': 'test-session-id',
model: 'gemini-pro',
type: 'output',
});
recordTokenUsageMetricsModule(mockConfig, 'gemini-pro', 25, 'thought');
expect(mockCounterAddFn).toHaveBeenCalledWith(25, {
'session.id': 'test-session-id',
model: 'gemini-pro',
type: 'thought',
});
recordTokenUsageMetricsModule(mockConfig, 'gemini-pro', 75, 'cache');
expect(mockCounterAddFn).toHaveBeenCalledWith(75, {
'session.id': 'test-session-id',
model: 'gemini-pro',
type: 'cache',
});
recordTokenUsageMetricsModule(mockConfig, 'gemini-pro', 125, 'tool');
expect(mockCounterAddFn).toHaveBeenCalledWith(125, {
'session.id': 'test-session-id',
model: 'gemini-pro',
type: 'tool',
});
});
it('should handle different models', () => {
initializeMetricsModule(mockConfig);
mockCounterAddFn.mockClear();
recordTokenUsageMetricsModule(mockConfig, 'gemini-ultra', 200, 'input');
expect(mockCounterAddFn).toHaveBeenCalledWith(200, {
'session.id': 'test-session-id',
model: 'gemini-ultra',
type: 'input',
});
});
});
describe('recordFileOperationMetric', () => {
const mockConfig = {
getSessionId: () => 'test-session-id',
} as unknown as Config;
it('should not record metrics if not initialized', () => {
recordFileOperationMetricModule(
mockConfig,
FileOperation.CREATE,
10,
'text/plain',
'txt',
);
expect(mockCounterAddFn).not.toHaveBeenCalled();
});
it('should record file creation with all attributes', () => {
initializeMetricsModule(mockConfig);
recordFileOperationMetricModule(
mockConfig,
FileOperation.CREATE,
10,
'text/plain',
'txt',
);
expect(mockCounterAddFn).toHaveBeenCalledTimes(2);
expect(mockCounterAddFn).toHaveBeenNthCalledWith(1, 1, {
'session.id': 'test-session-id',
});
expect(mockCounterAddFn).toHaveBeenNthCalledWith(2, 1, {
'session.id': 'test-session-id',
operation: FileOperation.CREATE,
lines: 10,
mimetype: 'text/plain',
extension: 'txt',
});
});
it('should record file read with minimal attributes', () => {
initializeMetricsModule(mockConfig);
mockCounterAddFn.mockClear();
recordFileOperationMetricModule(mockConfig, FileOperation.READ);
expect(mockCounterAddFn).toHaveBeenCalledWith(1, {
'session.id': 'test-session-id',
operation: FileOperation.READ,
});
});
it('should record file update with some attributes', () => {
initializeMetricsModule(mockConfig);
mockCounterAddFn.mockClear();
recordFileOperationMetricModule(
mockConfig,
FileOperation.UPDATE,
undefined,
'application/javascript',
);
expect(mockCounterAddFn).toHaveBeenCalledWith(1, {
'session.id': 'test-session-id',
operation: FileOperation.UPDATE,
mimetype: 'application/javascript',
});
});
});
});
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