Test drive your windows phone application

Dror HelperSenior consultant@dhelper | http://blog.drorhelper.com | drorh@oz-code.com

Test drive your windows phone application

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• Developing software (professionally) since 2002

• TDD/Unit testing evangelist

• Not a windows phone 8 expert

• Blogger: http://blog.drorhelper.com

About.ME

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Unit testing mobile applications is:

Impossible

or Too damn hard

orNot cost effective

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The truth is that unit testing mobile applications is easy and fully supported* by your IDE

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Test individual unit of work

For developers by developers

A unit test is…

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1. Tests specific functionality

2. Clear pass/fail criteria

3. Good unit test runs in isolation

Pillars of good unit test

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[Test]public void CheckPassword_ValidUser_ReturnTrue()

{bool result = CheckPassword(“Skroob”,

“12345”);

Assert.That(result, Is.True);}

This is a unit test

• Unit tests should be:– Small– Atomic– Test a single functional unit– Isolated!

• Integration tests - test several units together• Functional/System tests

Test classification

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Saves time & moneyDon’t need to run full flow to test codeReduce manual testing effort

Catch regression issuesDocumentation

And especially

Why write unit tests

In the distant past (2008)

The ultimate tool was created

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Before that - a History lesson

Notifier

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The new Notifier

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The flow to implement

WP8 App UserRepository HttpClient StackExchange

GetUserHttpGetAsync

HTTP GET

JSON (Compressed)JSON

User

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Writing the “client”

WP8 App UserRepository HttpClient StackExchange

GetUserHttpGetAsync

HTTP GET

JSON (Compressed)JSON

User

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Get (user) data from StackOveflow

StackExchange API: Http-Get JSON

Our client

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Write and build managed assemblies targeted to one or more .NET framework platform

Portable library

PCL

.NET Framework

Silverlight

Windows PhoneWinRT

Xbox 360

Xamarin

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Test as plain old .NET code

unit testing framework of choice

The new (and shiny) Test Explorer

Testing portable library

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The problem with external services

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a

[Test] public void AddTest() {

var cut = new Calculator(); var result = cut.Add(2, 3);

Assert.AreEqual(5, result); }

This is unit testnot a

real

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Testing in Isolation

WP8 App UserRepository HttpClient StackExchange

GetUserHttpGetAsync

HTTP GET

JSON (Compressed)JSON

User

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Testing in UserRepository in Isolation

Test Code UserRepository Fake HttpClient

GetUserHttpGetAsync

JSONUser

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• Create Fake objects

• Set behavior on fake objects

• Verify method was called

• And more...

What Mocking framework can do for you?

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Testing our application

WP8 App UserRepository HttpClient StackExchange

GetUserHttpGetAsync

HTTP GET

JSON (Compressed)JSON

User

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MVVM to the rescue

ViewModel ViewModelCommands

Binding

Easy to create Easy to test

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MSTest

Using Emulator

Async Test methods supported

Test logic (Model/ViewModels)

The “real” WP8 unit testing

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Async test won’t run return Task from test method

UnauthorizedAccessAxception use [UITestMethod]

Pitfalls and gotchas

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• Unit testing == good

• Unit testing portable code as simple as “regular” code

• Unit testing WP8 logic is easy(ish)

Summary

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Dror HelperC: 972.50.7668543e: drorh@oz-code.comB: blog.drorhelper.comw: www.ozcode.net