Install mocha

npm install -g mocha



In [1]:

    
%load_ext ipython_unittest.dojo



In [2]:

    
%%write javascript test.js
var assert = require('assert');
describe('Array', function() {
  describe('#indexOf()', function() {
    it('should return -1 when the value is not present', function() {
      assert.equal(-1, [1,2,3].indexOf(4));
    });
  });
});









    














    



Overwriting test.js



In [3]:

    
%%external --previous 1
mocha test.js









    














    




  Array
    #indexOf()
      ✓ should return -1 when the value is not present


  1 passing (8ms)







    














    














    Out[3]:





True