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metrics.test.ts
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import { FetchMock } from 'jest-fetch-mock';
import Metrics from './metrics';
import { getTypeSafeRequest, parseRequestBodyWithType } from './tests/util';
jest.useFakeTimers();
const fetchMock = fetch as FetchMock;
afterEach(() => {
fetchMock.resetMocks();
jest.clearAllTimers();
});
test('should be disabled by flag disableMetrics', async () => {
const metrics = new Metrics({
appName: 'test',
metricsInterval: 0,
disableMetrics: true,
url: 'http://localhost:3000',
clientKey: '123',
fetch: fetchMock,
headerName: 'Authorization',
});
metrics.count('foo', true);
await metrics.sendMetrics();
expect(fetchMock.mock.calls.length).toEqual(0);
});
test('should send metrics', async () => {
const metrics = new Metrics({
appName: 'test',
metricsInterval: 0,
disableMetrics: false,
url: 'http://localhost:3000',
clientKey: '123',
fetch: fetchMock,
headerName: 'Authorization',
});
metrics.count('foo', true);
metrics.count('foo', true);
metrics.count('foo', false);
metrics.count('bar', false);
await metrics.sendMetrics();
expect(fetchMock.mock.calls.length).toEqual(1);
/** Parse request and get its body with casted type */
const request = getTypeSafeRequest(fetchMock);
const body =
parseRequestBodyWithType<{ bucket: Metrics['bucket'] }>(request);
expect(body.bucket.toggles.foo.yes).toEqual(2);
expect(body.bucket.toggles.foo.no).toEqual(1);
expect(body.bucket.toggles.bar.yes).toEqual(0);
expect(body.bucket.toggles.bar.no).toEqual(1);
});
test('should send metrics under custom header', async () => {
const metrics = new Metrics({
appName: 'test',
metricsInterval: 0,
disableMetrics: false,
url: 'http://localhost:3000',
clientKey: '123',
fetch: fetchMock,
headerName: 'NotAuthorization',
});
metrics.count('foo', true);
await metrics.sendMetrics();
const requestBody = getTypeSafeRequest(fetchMock);
expect(fetchMock.mock.calls.length).toEqual(1);
expect(requestBody.headers).toMatchObject({
NotAuthorization: '123',
});
});
test('Should send initial metrics after 2 seconds', () => {
const metrics = new Metrics({
appName: 'test',
metricsInterval: 5,
disableMetrics: false,
url: 'http://localhost:3000',
clientKey: '123',
fetch: fetchMock,
headerName: 'Authorization',
});
metrics.start();
metrics.count('foo', true);
metrics.count('foo', true);
metrics.count('foo', false);
metrics.count('bar', false);
// Account for 2 second timeout before the set interval starts
jest.advanceTimersByTime(2000);
expect(fetchMock.mock.calls.length).toEqual(1);
});
test('should send metrics based on timer interval', async () => {
const metrics = new Metrics({
appName: 'test',
metricsInterval: 5,
disableMetrics: false,
url: 'http://localhost:3000',
clientKey: '123',
fetch: fetchMock,
headerName: 'Authorization',
});
metrics.start();
metrics.count('foo', true);
metrics.count('foo', true);
metrics.count('foo', false);
metrics.count('bar', false);
// Account for 2 second timeout before the set interval starts
jest.advanceTimersByTime(2000);
metrics.count('foo', true);
metrics.count('foo', true);
metrics.count('foo', false);
metrics.count('bar', false);
// Fill bucket and advance the interval
jest.advanceTimersByTime(5000);
metrics.count('foo', true);
metrics.count('foo', true);
metrics.count('foo', false);
metrics.count('bar', false);
// Fill bucket and advance the interval
jest.advanceTimersByTime(5000);
expect(fetchMock.mock.calls.length).toEqual(3);
});