I needed a solution for this because my code was calling the new operator. I wanted to mock the object that the new call created. var MockExample = sinon.stub(); MockExample.prototype.test = sinon.stub().returns(“42”); var example = new MockExample(); console.log(“example: ” + example.test()); // outputs 42 Then I used rewire to inject it into the code that …
I suspect you want the useFakeTimers function: var now = new Date(); var clock = sinon.useFakeTimers(now.getTime()); //assertions clock.restore(); This is plain JS. A working TypeScript/JavaScript example: var now = new Date(); beforeEach(() => { sandbox = sinon.sandbox.create(); clock = sinon.useFakeTimers(now.getTime()); }); afterEach(() => { sandbox.restore(); clock.restore(); });
You have to remove the spy after every test. Take a look at the example from the sinon docs: { setUp: function () { sinon.spy(jQuery, “ajax”); }, tearDown: function () { jQuery.ajax.restore(); // Unwraps the spy }, “test should inspect jQuery.getJSON’s usage of jQuery.ajax”: function () { jQuery.getJSON(“/some/resource”); assert(jQuery.ajax.calledOnce); assertEquals(“/some/resource”, jQuery.ajax.getCall(0).args[0].url); assertEquals(“json”, jQuery.ajax.getCall(0).args[0].dataType); } } …
At current sinon version v2.3.1, you can use stub.resolves(value) and stub.rejects(value) function For example, you can stub myClass.myFunction with following code sinon.stub(myClass, ‘myFunction’).resolves(‘the value you want to return’); or sinon.stub(myClass, ‘myFunction’).rejects(‘the error information you want to return’);
It totally feels like cheating, but since no one else is answering the question, here goes: Proxyquire takes over require and lets you inject fakes anywhere in the dependency chain. For requires you don’t take over and for methods you don’t define for requires you do take over, it’ll fall back to the original. This …
https://sinonjs.org/releases/latest/matchers/#sinonmatchany You can use sinon.match.any: method.get.withArgs(25, sinon.match.any, sinon.match.any);
For anyone else stumbling across this answer, Jest 22.1.0 introduced the ability to spy on getter and setter methods. Edit: like in scieslak’s answer below, because you can spy on getter and setter methods, you can use Jest mocks with them, just like with any other function: class MyClass { get something() { return ‘foo’ …
From my understanding of process.env, you can simply treat it like any other variable when setting its properties. Keep in mind, though, that every value in process.env must be a string. So, if you need a particular value in your test: it(‘does something interesting’, () => { process.env.NODE_ENV = ‘test’; // … }); To avoid …
Your code is attempting to stub a function on Sensor, but you have defined the function on Sensor.prototype. sinon.stub(Sensor, “sample_pressure”, function() {return 0}) is essentially the same as this: Sensor[“sample_pressure”] = function() {return 0}; but it is smart enough to see that Sensor[“sample_pressure”] doesn’t exist. So what you would want to do is something like …
You should restore the getObj in after() function, please try it as below. describe(‘App Functions’, function(){ var mockObj; before(function () { mockObj = sinon.stub(testApp, ‘getObj’, () => { console.log(‘this is sinon test 1111’); }); }); after(function () { testApp.getObj.restore(); // Unwraps the spy }); it(‘get results’,function(done) { testApp.getObj(); }); }); describe(‘App Errors’, function(){ var mockObj; …