TDD, unit testing and java script testing frameworks workshop

Boutique product development company
It is amazing what you can accomplish when you have a client-centric team to deliver outstanding products.

Boutique product development company
It is amazing what you can accomplish when you have a client-centric team to deliver outstanding products.
Unit Testing, Test Driven Development
and JavaScript Testing Frameworks
Sikandar Ahmed | Lead Software Engineer
Ahmad Awais | Software Engineer

Unit Testing increases the code quality
Unit Testing, TDD and
JavaScript Testing
Frameworks
Testing Types
Overview of Unit Testing
Best Practices
Some Difficult Scenarios
Levels of TDD
Test Driven Development
TDD and Agile
Extreme Programming
Comparison of available JS Testing frameworks
Introduction to Jasmine Framework
Examples
Jasmine Framework practical's
Karma Framework practical’s

WHY Unit Testing

Types of Tests

Overview
What is Unit Test
–Verifies an atomic piece of code
–Test on specific behavior
–Each test is autonomous

Why Unit Testing
Consider building a car
from start to finish,
each of the parts which
make the engine, the
chassis, the wheels,
must be individually
verified to be in working
order before they are to
be assembled into a
'car'.

Unit Tests are written by developers!
 Increase confidence in code
 Fearlessly change your code
 Discover usability issues early

Test is not a Unit if
Interact over parts of system.
Take too much time to execute (>0.01 Sec).
Require Manual Setup.

Unit Test Best Practices
1. Consistent
2. Atomic
3. Single Responsibility
4. Self Descriptive

Single Responsibility
1. One condition per test
2. One reason to change

Unit Test Best Practices

Difficult Scenarios

Continue..
– Mocks
– Stubs
– Fake

Levels of TDD
– Acceptance TDD(ATDD)
– Developer TDD

Test Driven Development
•Write Test
•Fail the test
•Write Minimum Code
•Pass the test
•Re factor Code
•Meet standards

Why Test Driven Development

TDD is not about Testing
TDD is about
–Design and Development
•By testing first you design your code

Unit Testing and TDD

Rules for Extreme Programming
1. User stories (planning)
2. Small releases
3. Metaphor (standardized naming schemes)
4. Collective ownership
5. Coding standard:
6. Simple design
7. Refactoring
8. TDD
9. Pair programming
10.Continuous integration
11.40-hour workweek
12.On-site customer

Comparison of JS Unit Testing Frameworks
Framework Suitable for
Direct access to
JavaScript DOM API
Remote
control
File
watching
File
preprocessing
Tests written
in
Karma
unit yes yes yes yes yes any
JSTestDriver
unit yes yes yes no no JS
Selenium
e2e no yes yes no no any
WebDriver
e2e no yes yes no no any
Jasmine
unit yes yes no no no JS

Jasmine Framework
• Jasmine is a behavior-driven development framework for testing your JavaScript
code. It does not depend on any other JavaScript frameworks. It does not require a
DOM.
Jasmine API includes features such as:
• A more natural BDD syntax for organizing the test logic than JUnit style assertion
test frameworks
• Asynchronous testing
• Mocks
• Easy to create custom matchers
• Ability to share or isolate behaviors between tests within a spec encapsulating parts
of your spec.
• Continuous integration support

Jasmine Framework: Syntax
Jasmine aims to be easy to read. A simple hello world test looks like this:
describe('Hello world', function() {
it('says hello', function() {
expect(helloWorld()).toEqual("Hello world!");
});
});

Jasmine Framework: Test Suite and Test Cases
describe('MyApp Test Suite:', function() { });
• The above “Describe” block defines the test suite in Jasmine, in test suite
single or multiple test cases can be written.
it('Should contain no JavaScript coding errors!', function() {
expect(errorCount).toBe(0); });
• This above “It” block is representing the test cases which can written in
Describe block. Expect showing the expected result for the particular test case.

Jasmine Framework: Spec and JS Code
A Jasmine test case is written as follows:
// your applications custom code
function addValues( a, b )
{ return a + b; };
// the Jasmine test code
describe("addValues(a, b) function", function() {
it("should equal 3", function(){
expect( addValues(1, 2) ).toBe( 3 ); });
it("should equal 3.75", function(){
expect( addValues(1.75, 2) ).toBe( 3.75 ); });
it("should NOT equal '3' as a String", function(){
expect( addValues(1, 2) ).not.toBe( "3" ); });
});

Jasmine Framework: Spec Runner (Running the Unit Tests)
Launching the SpecRunner.html file in your local browser runs the tests. Jasmine
provides a nice view of the test results.

Jasmine Framework: Pros and Cons
Pros:
• Should not be tied to any browser, framework, platform, or host language.
• Should have idiomatic and unsurprising syntax.
• Should work anywhere JavaScript can run, including browsers, servers, phones, etc.
• Shouldn't intrude in your application's territory (e.g. by cluttering the global
namespace).
• Should play well with IDEs (e.g. test code should pass static analysis).
• It should integrate easily with continuous build systems.
• It should be simple to get started with.
Cons:
Not Much examples available

Basic general test cases
Rainy Days
Sencha Project unit tests
Karma Practical App – ToDo App
Practical Example

Jasmine can Use with
• Ruby (with or without Rails)
• Spider Monkey
• Node.js
• JS Test Driver
• Java (with Maven)
• DOT NET
• PERL
• Scala

Testing in Angular JS

References
http://evanhahn.com/how-do-i-jasmine/
http://pivotal.github.io/jasmine/
http://stackoverflow.com/questions/300855/javascript-unit-test-tools-for-tdd
http://docs.angularjs.org/tutorial
http://edspencer.net/2013/07/28/jasmine-and-jenkins-continuous-integration/
http://stackoverflow.com/questions/3459287/whats-the-difference-between-a-mock-
stub

Q&A
Thanks for Attending

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