Embed Size (px)
DESCRIPTION
Unit testing is a modern engineering practice that speed up development and give developers and testers a quick way to look for logic errors in the methods of apps they’ve written. There is no excuse not to write unit tests for windows phone – since both the architecture and tools makes it feasible and simple. In this talk I’ll show examples and strategies of unit testing windows phone applications and how you can take control of your code today!
Citation preview
Dror HelperSenior consultant@dhelper | http://blog.drorhelper.com | [email protected]
Test drive your windows phone application
2
• Developing software (professionally) since 2002
• TDD/Unit testing evangelist
• Not a windows phone 8 expert
• Blogger: http://blog.drorhelper.com
About.ME
3
Unit testing mobile applications is:
Impossible
or Too damn hard
orNot cost effective
4
The truth is that unit testing mobile applications is easy and fully supported* by your IDE
5
Test individual unit of work
For developers by developers
A unit test is…
6
1. Tests specific functionality
2. Clear pass/fail criteria
3. Good unit test runs in isolation
Pillars of good unit test
7
[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
9
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
10
Before that - a History lesson
Notifier
11
The new Notifier
12
The flow to implement
WP8 App UserRepository HttpClient StackExchange
GetUserHttpGetAsync
HTTP GET
JSON (Compressed)JSON
User
13
Writing the “client”
WP8 App UserRepository HttpClient StackExchange
GetUserHttpGetAsync
HTTP GET
JSON (Compressed)JSON
User
14
Get (user) data from StackOveflow
StackExchange API: Http-Get JSON
Our client
15
Write and build managed assemblies targeted to one or more .NET framework platform
Portable library
PCL
.NET Framework
Silverlight
Windows PhoneWinRT
Xbox 360
Xamarin
16
Test as plain old .NET code
unit testing framework of choice
The new (and shiny) Test Explorer
Testing portable library
17
The problem with external services
18
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
19
Testing in Isolation
WP8 App UserRepository HttpClient StackExchange
GetUserHttpGetAsync
HTTP GET
JSON (Compressed)JSON
User
20
Testing in UserRepository in Isolation
Test Code UserRepository Fake HttpClient
GetUserHttpGetAsync
JSONUser
21
• Create Fake objects
• Set behavior on fake objects
• Verify method was called
• And more...
What Mocking framework can do for you?
22
Testing our application
WP8 App UserRepository HttpClient StackExchange
GetUserHttpGetAsync
HTTP GET
JSON (Compressed)JSON
User
23
MVVM to the rescue
ViewModel ViewModelCommands
Binding
Easy to create Easy to test
24
MSTest
Using Emulator
Async Test methods supported
Test logic (Model/ViewModels)
The “real” WP8 unit testing
25
Async test won’t run return Task from test method
UnauthorizedAccessAxception use [UITestMethod]
Pitfalls and gotchas
26
• Unit testing == good
• Unit testing portable code as simple as “regular” code
• Unit testing WP8 logic is easy(ish)
Summary
