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index.test.js
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index.test.js
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const log4js = require('log4js');
jest.mock('log4js', () => ({
getLogger: jest.fn(),
configure: jest.fn(),
}));
const logger = require('./index');
describe('Logger', () => {
beforeEach(jest.clearAllMocks);
describe('initLogger', () => {
it('should call the log4js configuration', () => {
const { mock } = log4js.configure.mockImplementation();
logger.initLogger();
expect(mock.calls[0][0]).toBeTruthy();
});
it('should allow a logLevel parameters', () => {
const { mock } = log4js.configure.mockImplementation();
logger.initLogger('info');
expect(mock.calls[0][0].categories.default.level).toEqual('info');
});
});
it('should create a log4js object', () => {
const { mock } = log4js.getLogger.mockImplementation();
logger.getLogger('Test context');
expect(mock.calls[0][0]).toEqual('Test context');
});
it('should return an object when called', () => {
log4js.getLogger.mockReturnValue({ warn: jest.fn(), info: jest.fn() });
const loggerInstance = logger.getLogger('Context');
expect(loggerInstance.warn).toBeTruthy();
expect(loggerInstance.info).toBeTruthy();
});
});