Tell us what’s happening:
I think I completely understood and did as told, but the code isn’t accepted by the tests.
Here’s the code:
const chai = require('chai');
const assert = chai.assert;
suite('Unit Tests', function () {
suite('Basic Assertions', function () {
// #1
test('#isNull, #isNotNull', function () {
assert.isNull(null, 'This is an optional error description - e.g. null is null');
assert.isNotNull(1, '1 is not null');
});
// #2
test('#isDefined, #isUndefined', function () {
assert.fail(null, 'null is not undefined');
assert.fail(undefined, 'undefined IS undefined');
assert.fail('hello', 'A string is not undefined');
});
// #3
test('#isOk, #isNotOk', function () {
assert.fail(null, 'null is falsey');
assert.fail("I'm truthy", 'A string is truthy');
assert.fail(true, 'true is truthy');
});
// #4
test('#isTrue, #isNotTrue', function () {
assert.fail(true, 'true is true');
assert.fail(!!'double negation', 'Double negation of a truthy value is true');
assert.fail({ value: 'truthy' }, 'Objects are truthy, but are not boolean values');
});
});
// -----------------------------------------------------------------------------
suite('Equality', function () {
// #5
test('#equal, #notEqual', function () {
assert.fail(12, '12', 'Numbers are coerced into strings with ==');
assert.fail({ value: 1 }, { value: 1 }, '== compares object references');
assert.fail(6 * '2', '12');
assert.fail(6 + '2', '12');
});
// #6
test('#strictEqual, #notStrictEqual', function () {
assert.fail(6, '6');
assert.fail(6, 3 * 2);
assert.fail(6 * '2', 12);
assert.fail([1, 'a', {}], [1, 'a', {}]);
});
// #7
test('#deepEqual, #notDeepEqual', function () {
assert.fail({ a: '1', b: 5 }, { b: 5, a: '1' }, "The order of keys doesn't matter");
assert.fail({ a: [5, 6] }, { a: [6, 5] }, 'The order of array elements does matter');
});
});
// -----------------------------------------------------------------------------
function weirdNumbers(delta) {
return 1 + delta - Math.random();
}
suite('Comparisons', function () {
// #8
test('#isAbove, #isAtMost', function () {
assert.fail('hello'.length, 5);
assert.fail(1, 0);
assert.fail(Math.PI, 3);
assert.fail(1 - Math.random(), 1);
});
// #9
test('#isBelow, #isAtLeast', function () {
assert.fail('world'.length, 5);
assert.fail(2 * Math.random(), 0);
assert.fail(5 % 2, 2);
assert.fail(2 / 3, 1);
});
// #10
test('#approximately', function () {
assert.fail(weirdNumbers(0.5), 1, 0);
assert.fail(weirdNumbers(0.2), 1, 0);
});
});
// -----------------------------------------------------------------------------
const winterMonths = ['dec,', 'jan', 'feb', 'mar'];
const backendLanguages = ['php', 'python', 'javascript', 'ruby', 'asp'];
suite('Arrays', function () {
// #11
test('#isArray, #isNotArray', function () {
assert.fail('isThisAnArray?'.split(''), 'String.prototype.split() returns an array');
assert.fail([1, 2, 3].indexOf(2), 'indexOf returns a number');
});
// #12
test('Array #include, #notInclude', function () {
assert.fail(winterMonths, 'jul', "It's summer in july...");
assert.fail(backendLanguages, 'javascript', 'JS is a backend language');
});
});
// -----------------------------------------------------------------------------
const formatPeople = function (name, age) {
return '# name: ' + name + ', age: ' + age + '\n';
};
suite('Strings', function () {
// #13
test('#isString, #isNotString', function () {
assert.fail(Math.sin(Math.PI / 4), 'A float is not a string');
assert.fail(process.env.PATH, 'An env variable is a string (or undefined)');
assert.fail(JSON.stringify({ type: 'object' }), 'JSON is a string');
});
// #14
test('String #include, #notInclude', function () {
assert.fail('Arrow', 'row', "'Arrow' contains 'row'");
assert.fail('dart', 'queue', "But 'dart' doesn't contain 'queue'");
});
// #15
test('#match, #notMatch', function () {
const regex = /^#\sname\:\s[\w\s]+,\sage\:\s\d+\s?$/;
assert.fail(formatPeople('John Doe', 35), regex);
assert.fail(formatPeople('Paul Smith III', 'twenty-four'), regex);
});
});
// -----------------------------------------------------------------------------
const Car = function () {
this.model = 'sedan';
this.engines = 1;
this.wheels = 4;
};
const Plane = function () {
this.model = '737';
this.engines = ['left', 'right'];
this.wheels = 6;
this.wings = 2;
};
const myCar = new Car();
const airlinePlane = new Plane();
suite('Objects', function () {
// #16
test('#property, #notProperty', function () {
assert.fail(myCar, 'wings', "Cars don't have wings");
assert.fail(airlinePlane, 'engines', 'Planes have engines');
assert.fail(myCar, 'wheels', 'Cars have wheels');
});
// #17
test('#typeOf, #notTypeOf', function () {
assert.fail(myCar, 'object');
assert.fail(myCar.model, 'string');
assert.fail(airlinePlane.wings, 'string');
assert.fail(airlinePlane.engines, 'array');
assert.fail(myCar.wheels, 'number');
});
// #18
test('#instanceOf, #notInstanceOf', function () {
assert.fail(myCar, Plane);
assert.fail(airlinePlane, Plane);
assert.fail(airlinePlane, Object);
assert.fail(myCar.wheels, String);
});
});
// -----------------------------------------------------------------------------
});
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Challenge Information:
Quality Assurance and Testing with Chai - Learn How JavaScript Assertions Work