Unit testing

Unit Testing

Abhinav Gujjar

@abhinavgujjar

RULES!

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Agenda

What is Unit TestingWhy unit test ?Unit Testing Frameworks for .NetBest Practices for unit testingTest Driven Development (TDD)Unit testing in Agile

Urgh – Not my job

I’m a Developer. I don’t test.

I pay testers for testing

In The Real World

In The Real World

Different Types of Testing

Development Testing Deployment

Unit Testing Functional Testing

Integration Testing

Acceptance Testing

DEMO

Simple Interest Calculation

What?

You are already doing it… But not correctly

Prove the correctness of a small isolated piece of functionality in a larger system

Why?

Higher QualityBetter CodeDocumentation

How?

Unit Testing Frameworks.Net

nUnit xUnitmsTest

Demo

Creating unit tests

Anatomy

Unit Test Framework

Unit Tests

Arrange

Act

Assert

Red-Green Refactor Cycle

Red

GreenRefactor

One Assert per test

One logical assertion per testMay need more than one Assert statement

Qualities of a Unit Test

RepeatableIndependent

Exercise

Writing Tests

Testing the Sad Path

Assertions !

Simple Assertions Collection AssertsString Asserts

Test Setup and Tear Downs

AssemblyClassTest

Isolating Code

Isolation Techniques

DummiesStubsFake – Maintain StateSpy – Maintains state and is available for assertionMock – Complex behavior

Mocking Frameworks

MoqRhinoMocksnMock

Silverlight Unit Testing

Tests are run on the browserMoq available! Yay !But - Only if you use the MVVM pattern

View Model First Approach

Refactoring

When is done done ?Code may be correct

But is it healthy?

Readability

Maintainability

What about performance ?

Technical Debt

Code Smells

Duplicated Code

Long Method

Long Parameter List

Large Class

Comments !!

Switch statements

Dead Code

…

…

Testing Legacy Code

Why?When?How?

Happy Unit Testing!

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