Financial-Times / n-express-enhancer

describe('toMiddlewareWrapper', () => {

	it('enhance input function with toMiddleware', () => {

		const operationFunction = () => {};

		const enhanced = toMiddlewareWrapper(operationFunction);

		expect(typeof enhanced).toBe('function');

		expect(enhanced.name).toBe('operationFunction');

	});

	it('enhance input function bundle with toMiddlewares', () => {

		const createOperationFunction = () => () => {};

		const bundle = {

			methodA: createOperationFunction(),

			methodB: createOperationFunction(),

		};

		const enhanced = toMiddlewareWrapper(bundle);

		expect(typeof enhanced).toBe('object');

		expect(typeof enhanced.methodA).toBe('function');

		expect(enhanced.methodA.name).toBe('methodA');

		expect(typeof enhanced.methodB).toBe('function');

		expect(enhanced.methodB.name).toBe('methodB');

	});

	it('throws error if given invalid input', () => {

		const inputString = () => toMiddlewareWrapper('test');

		expect(inputString).toThrowErrorMatchingSnapshot();

		const inputInvalidObject = () =>

			toMiddlewareWrapper({

				foo: 'bar',

			});

		expect(inputInvalidObject).toThrowErrorMatchingSnapshot();

	});

});