power-assert-js/power-assert

mocha & power-assert cannot output the descriptive assertion messages

Rlilyyy opened this issue · 2 comments

Rlilyyy commented

I am trying to use official demo with power-assert. After Mocha run the unit test, it output func.apply(thisObj, args) insted of the descriptive assertion messages.

spec.js

const assert = require('power-assert');

describe('Array', function(){
    let ary;
    beforeEach(() => {
        ary = [1,2,3];
    });
    describe('#indexOf()', () => {
        it('should return index when the value is present', () => {
            const zero = 0, two = 2;
            assert(ary.indexOf(zero) === two);
        });
        it('should return -1 when the value is not present', () => {
            const minusOne = -1, two = 2;
            assert.ok(ary.indexOf(two) === minusOne, 'THIS IS AN ASSERTION MESSAGE');
        });
    });
});

describe('various types', () => {
    let types;
    class Person {
        constructor(name, age) {
            this.name = name;
            this.age = age;
        }
    }
    beforeEach(() => {
        types = [
            'string', 98.6, true, false, null, undefined,
            ['nested', 'array'],
            {object: true},
            NaN, Infinity,
            /^not/,
            new Person('alice', 3)
        ];
    });
    it('demo', () => {
        const index = types.length -1,
            bob = new Person('bob', 5);
        assert(types[index].name === bob.name);
    });
});

ouput

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

  various types
    3) demo


  0 passing (15ms)
  3 failing

  1) Array
       #indexOf()
         should return index when the value is present:

      AssertionError [ERR_ASSERTION]: The expression evaluated to a falsy value:

  func.apply(thisObj, args)

      + expected - actual

      -false
      +true
      
      at Decorator._callFunc (node_modules/empower-core/lib/decorator.js:110:20)
      at Decorator.concreteAssert (node_modules/empower-core/lib/decorator.js:103:17)
      at decoratedAssert (node_modules/empower-core/lib/decorate.js:51:30)
      at powerAssert (node_modules/empower-core/index.js:63:32)
      at Context.it (test/index.spec.js:11:7)

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

      AssertionError [ERR_ASSERTION]: THIS IS AN ASSERTION MESSAGE
      + expected - actual

      -false
      +true
      
      at Decorator._callFunc (node_modules/empower-core/lib/decorator.js:110:20)
      at Decorator.concreteAssert (node_modules/empower-core/lib/decorator.js:103:17)
      at Function.decoratedAssert [as ok] (node_modules/empower-core/lib/decorate.js:51:30)
      at Context.it (test/index.spec.js:15:14)

  3) various types
       demo:

      AssertionError [ERR_ASSERTION]: The expression evaluated to a falsy value:

  func.apply(thisObj, args)

      + expected - actual

      -false
      +true
      
      at Decorator._callFunc (node_modules/empower-core/lib/decorator.js:110:20)
      at Decorator.concreteAssert (node_modules/empower-core/lib/decorator.js:103:17)
      at decoratedAssert (node_modules/empower-core/lib/decorate.js:51:30)
      at powerAssert (node_modules/empower-core/index.js:63:32)
      at Context.it (test/index.spec.js:41:5)

Mocha v6.1.4
power-assert v1.6.1
Node v10.15.2

bannerchi commented

same problem for me