auru / unity-api

import sinon from 'sinon';

import applyMiddleware from '../src/applyMiddleware';

const noop = _ => _;

test('applyTo is required', t => {

test('applyTo is not a function', t => {

    const applyTo = 'oops';

    t.throws(() => applyMiddleware(applyTo));

});

test('no middleware returns default params', t => {

    const spyApplyTo = sinon.spy(noop);

    t.deepEqual(applyMiddleware(spyApplyTo), {});

    t.true(spyApplyTo.calledOnce);

    t.true(spyApplyTo.calledWithExactly({}));

});

test('no functional middleware returns default params', t => {

    const applyTo = sinon.spy(noop);

    const middlewares = [

        'test', undefined, {}, [], 123, null, NaN, /^/

    ];

    t.deepEqual(applyMiddleware(applyTo, middlewares), {});

    t.true(applyTo.calledOnce);

    t.true(applyTo.calledWithExactly({}));

});

test('one middleware', t => {

    const applyTo = sinon.spy(noop);

    const middleware = sinon.spy(noop);

    const options = { options: 'options' };

    const params = { params: 'params' };

    const resourceId = 'resourceId';

    const method = 'method';

    t.deepEqual(applyMiddleware(applyTo, [ middleware ], options, params, resourceId, method), params);

    t.true(applyTo.calledOnce);

    t.true(applyTo.calledWithExactly(params, options, params, resourceId, method));

    t.true(middleware.calledOnce);

    const middlewareSpyCall = middleware.getCall(0);

    t.true(middlewareSpyCall.args.length === 1);

    t.true(middlewareSpyCall.args[0] instanceof Function);

    t.falsy(middlewareSpyCall.thisValue);

    t.true(middlewareSpyCall.args[0].prototype === undefined);

});

test('multiple middlewares', t => {

    const applyTo = sinon.spy(noop);

    const middleware1 = sinon.spy(noop);

    const middleware2 = sinon.spy(noop);

    const options = { options: 'options' };

    const params = { params: 'params' };

    const resourceId = 'resourceId';

    const method = 'method';

    t.deepEqual(applyMiddleware(applyTo, [ middleware1, middleware2 ], options, params, resourceId, method), params);

    t.true(applyTo.calledOnce);

    t.true(applyTo.calledWithExactly(params, options, params, resourceId, method, options, params, resourceId, method));

    t.true(middleware1.calledOnce);

    t.true(middleware2.calledOnce);

    const middleware1SpyCall = middleware1.getCall(0);

    t.true(middleware1SpyCall.args.length === 1);

    t.true(middleware1SpyCall.args[0] instanceof Function);

    t.falsy(middleware1SpyCall.thisValue);

    t.true(middleware1SpyCall.args[0].prototype === undefined);

    const middleware2SpyCall = middleware2.getCall(0);

    t.true(middleware2SpyCall.args.length === 1);

    t.true(middleware2SpyCall.args[0] instanceof Function);

    t.falsy(middleware2SpyCall.thisValue);

    t.true(middleware2SpyCall.args[0].prototype === undefined);