Jasmine JavaScript Testing

This post enlighten by Jasmine JavaScript Testing

unit test

a piece of code tests a functionality of unit of application code.

Jasmine

Jasmine: behavior-driven development test framework

TDD vs. BDD

test-driven development turns into behavior-driven development by Dan North

BDD

• Given: this provides an initial context
• When: this defines the event occurs
• Then: this ensures an outcome

Jasmine BDD example

describe("Player", function() {
    describe("when song has been paused", function() {
       it("should indicate that the song is paused", function() {
        }); 
    });
});

spec

each unit test call spec, short for specification

write a Jasmine test

describe function is a global Jasmine function, used to define test contest, it creates a new test suite(a collection of test cases), acceptes two params:

• string: name of test suite
• function: a function that will contains all its specs

describe("Investment", function() { });

it, another golbal Jasmine function, accepts two params:

• string: title of the spec
• function: a function that will contains the spec code

describe("Investment", function() {
    it("should be of a stock", function() {
    });
});

expect, an assertion or expectation is a comparison between two values, result of comparison is true means success, along with a matcher that indicates what comparison must be made with the values.

describe("Investment", function() { 
    it("should be of a stock", function() { 
        expect(investment.stock).toBe(stock);
    });
});

Setup and teardown

• beforeEach: setup function, runs from outside before every spec(it)
• run spec(it)
• afterEach: teardown function, runs from outside after every spec(it)

Write unit test in *Spec.js

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Debug and write more unit test