parametrized tests with Mocha

Question

How can I create parametrized tests with Mocha?

Sample use case: I have 10 classes, that are 10 different implementations of the same interface. I want to run the exact same suit of tests for each class. I can create a function, that takes the class as a parameter and runs all tests with that class, but then I will have all tests in a single function - I won't be able to separate them nicely to different "describe" clauses...

Is there a natural way to do this in Mocha?

Answer 1

You do not need async package. You can use forEach loop directly:

[1,2,3].forEach(function (itemNumber) {     describe("Test # " + itemNumber, function () {         it("should be a number", function (done) {             expect(itemNumber).to.be.a('number')             expect(itemNumber).to.be(itemNumber)          });     }); }); 

Answer 2

I know this was posted a while ago but there is now a node module that makes this really easy!! mocha param

const itParam = require('mocha-param').itParam; const myData = [{ name: 'rob', age: 23 }, { name: 'sally', age: 29 }];  describe('test with array of data', () => {     itParam("test each person object in the array", myData, (person) =>   {     expect(person.age).to.be.greaterThan(20);   }) })