I am having troubles trying to use assert.throws in my Mocha unit tests,  I have this method:  var getMetadatas = function (file, callback) {   fs.readFile(file, {encoding: 'utf-8'}, function(err, data){     // stuff       if (somethingWentWr...
In Chai, you can do stuff like the following:  expect({}).to.exist;   exist is not a function call, but this still works in testing frameworks. The opposite (expect({}).to.not.exist) causes tests to fail, but again, exist is not a function call.  How...
This is an example from mongoDB driver documentation. I've been trying to figure out what assert.equal does in the example, but the official documentation on Node.js website didn't help me too much -- The official documentation says "Test...
So I am trying to test out a function, it is a client-side function(un-finish) which is why it is embedded in the test itself(until I can figure out a better solution).  The problem I am having is when I test to see if the function is throwing a Type...
This has bugged me for a while. I throw an exception on an assertion failure, but this is only helpful if I can actually catch the exception (in which case I alert the user). If I can't catch the exception, then   I'm relying on the browser t...
I use console.assert at a lot of places in my Javascript library. It's a good practice from software development point of view (it's easiest form of unit testing). But I would like to know how much it will affect the performance of my library...
I have this example:  /(?=\d)(?=[a-z])/.test("3a") which returns false  but this  /(?=\d)(?=.*[a-z])/.test("3a") works.  Can you explain this?...
When using qunit to test, asserting that a value is specifically, exactly undefined is difficult. I am looking for a function that will:   compare against undefined so that a value of undefined satisfies the assertion, but anything else (including nu...
I have a function,  Edit1 - Updated function with real one because the previous one was simplified synchronous function and the code would have worked as correctly pointed by @AlexMA in the comments     'returnSuccessOrFailure': function () {...
I am practicing in writing some unit test by BDD use cucmber.js. When I try to use 'And' statement. The error shows that  TypeError: Add is not a function   Here is my code  .feature  Feature: dataTable Scenario Outline: <a> + <b>...

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