How to run a single test with Mocha?

Question

I use Mocha to test my JavaScript stuff. My test file contains 5 tests. Is that possible to run a specific test (or set of tests) rather than all the tests in the file?

Answer 1

Just use .only before 'describe', 'it' or 'context'. I run using "$npm run test:unit", and it executes only units with .only.

describe.only('get success', function() {
 // ...
});

it.only('should return 1', function() {
  // ...
});

Answer 2

You can try "it.only"

 it.only('Test one ', () => {

            expect(x).to.equal(y);
        });
it('Test two ', () => {

            expect(x).to.equal(y);
        });

in this the first one only will execute

Answer 3

Not sure why the grep method is not working for me when using npm test. This works though. I also need to specify the test folder also for some reason.

npm test -- test/sometest.js

Answer 4

Hi above solutions didn't work for me. The other way of running a single test is

mocha test/cartcheckout/checkout.js -g 'Test Name Goes here'

This helps to run a test case from a single file and with specific name.

Answer 5

Consolidate all your tests in one test.js file & your package json add scripts as:

  "scripts": {
  "api:test": "node_modules/.bin/mocha --timeout 10000 --recursive api_test/"
},

Type command on your test directory:

npm run api:test

Answer 6

Depending on your usage pattern, you might just like to use only. We use the TDD style; it looks like this:

test.only('Date part of valid Partition Key', function (done) {
    //...
}

Only this test will run from all the files/suites.