Function I'm spying on, receives object as an argument. I need to assert that the function been called with certain properties of the object.   e.g: my SUT has:   function kaboom() {      fn({          foo: 'foo',          bar: 'bar&#...
Can anyone help me with testing of following function  function onload(cb){   const image = 'http://placehold.it/350x150'   const img = new Image()   img.src = image   img.onload = () => {     cb()   } }   In my test file Image is availabl...
Let say we have a function that returns a function and bounds arguments to it:  function A(x, y){     return function(x, y){...}.bind(this, x, y); }   And now we want to know if function A binds arguments correctly:  var resultedFunction = A(); var s...
How can I test if a callback function from a event listener is called? For example, I have the following code where app.js initializes the application through the init.js controller.  The main.js file has a class which extends and Event Emitter, maki...
I've currently got an ES6 class with a constructor and two methods. I'm a tad confused as to why using Promise.reject(ex) within the .then() is resolving undefined. If someone wouldn't mind explaining what I'm doing wrong that would b...
Recently we started writing test cases for our application , we need help in writing test cases for controllers. We are using Mocha, chai and Snion libraries for writing test cases.  Here is the plunker link which contains our controller code in it....
I am new to unit testing and am using Mocha, Sinon and Chai to test NodeJs code. The problem is that my expectation for stub.calledWith() always fails when it is an object, even though the test error shows two objects which are syntactically identica...
I need to assert whether a constructor was called using sinon. Below is how I can create a spy.  let nodeStub: any; nodeStub = this.createStubInstance("node");   But how can I verify that this constructor was called with the relevant paramete...
I am trying to run a test that is meant to check if my React component's Add button gets clicked, so that a spy can catch that the appropriate method is being called and pass the test.  However I am encountering an error with ReactTestUtils.Simul...
I have following javascript class and writing unit test using mocha and sinon. When I run test case I see uncovered lines for  'return this._agentId;' and 'this._agentId = value;'.I am not sure how to cover these lines under test.I am...

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