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Copy pathdebugLogger.test.ts
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138 lines (125 loc) · 3.87 KB
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import { expectTypeOf } from 'expect-type';
import { withLogger } from './debugLogger';
describe('withLogger', () => {
let logger: any;
beforeEach(() => {
logger = {
enable: jest.fn(),
log: jest.fn(),
commit: jest.fn(),
};
});
it('should return the type of the passed handler', function () {
type Options = { name: string; test: number };
const handler = withLogger(
() => logger,
logger => (opts: Options) => {
logger.commit();
return opts.name;
},
);
expectTypeOf(handler).toMatchTypeOf<(opts: Options) => string>();
});
it('should log upon return of a sync function', function () {
const handler = withLogger(
() => logger,
logger => () => {
logger.enable();
logger.log('test');
return 'test';
},
);
expect(logger.enable).not.toHaveBeenCalled();
expect(logger.log).not.toHaveBeenCalled();
expect(logger.commit).not.toHaveBeenCalled();
handler();
expect(logger.enable).toHaveBeenCalled();
expect(logger.log).toHaveBeenCalled();
expect(logger.commit).toHaveBeenCalled();
});
it('should log before an error is thrown inside of a sync function', function () {
const handler = withLogger(
() => logger,
logger => () => {
logger.enable();
logger.log('test');
throw new Error();
},
);
expect(logger.enable).not.toHaveBeenCalled();
expect(logger.log).not.toHaveBeenCalled();
expect(logger.commit).not.toHaveBeenCalled();
try {
handler();
} catch (e) {
expect(e).toBeDefined();
expect(logger.enable).toHaveBeenCalled();
expect(logger.log).toHaveBeenCalled();
expect(logger.commit).toHaveBeenCalled();
}
});
it('should log upon return of a async function', async function () {
const handler = withLogger(
() => logger,
logger => async () => {
logger.enable();
logger.log('test');
const res = await new Promise(resolve => {
resolve('test');
});
return res;
},
);
expect(logger.enable).not.toHaveBeenCalled();
expect(logger.log).not.toHaveBeenCalled();
expect(logger.commit).not.toHaveBeenCalled();
await handler();
expect(logger.enable).toHaveBeenCalled();
expect(logger.log).toHaveBeenCalled();
expect(logger.commit).toHaveBeenCalled();
});
it('should log before an error is thrown inside of an async function', async function () {
const handler = withLogger(
() => logger,
logger => async () => {
logger.enable();
logger.log('test');
const res = await new Promise((_, reject) => {
reject(new Error());
});
return res;
},
);
expect(logger.enable).not.toHaveBeenCalled();
expect(logger.log).not.toHaveBeenCalled();
expect(logger.commit).not.toHaveBeenCalled();
try {
await handler();
} catch (e) {
expect(e).toBeDefined();
expect(logger.enable).toHaveBeenCalled();
expect(logger.log).toHaveBeenCalled();
expect(logger.commit).toHaveBeenCalled();
}
});
it('should truncate bytes to 4096 when deploying on vercel', () => {
// setup: mock vercel environment, mock console log so we can intercept its value
process.env.VERCEL = 'true';
const oldConsoleLog = console.log.bind(console);
const log = jest.fn();
console.log = log;
const veryLongString = new Array(6000).join('a');
const handler = withLogger('test-logger', logger => () => {
logger.enable();
logger.debug(veryLongString);
logger.debug(veryLongString);
});
handler();
for (const mockCall of log.mock.calls) {
expect(mockCall[0].length).toBeLessThanOrEqual(4096);
}
// restore original console log and reset environment value
process.env.VERCEL = undefined;
console.log = oldConsoleLog;
});
});