ASP.NET Core Unit Testing

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By Shahed Chowdhuri Sr. Technical Evangelist Automated Testing in ASP .NET Core* 1.0 Build Robust Web Apps in the Real World @shahedC WakeUpAndCode.com * aka ASP.NET 5 before RC1

Transcript of ASP.NET Core Unit Testing

Page 1: ASP.NET Core Unit Testing

By Shahed ChowdhuriSr. Technical Evangelist

Automated Testing in ASP .NET Core* 1.0Build Robust Web Apps in the Real World

@shahedC

WakeUpAndCode.com

* aka ASP.NET 5 before RC1

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Session Objectives And TakeawaysSession Objective(s): Explain why you would need automated testsPlan a more robust software architecture Implement automated testing for web apps

Automated tests provide the confidence needed to add new features to software while minimizing bugsNot having any automated tests will actually cost you more in the long run

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Agenda

Background> Getting Started > Writing and Running Tests> Dependency Injection & Mocking

What’s Next?

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Background

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Manual Testing

> Nothing new to learn

> Error-prone> Expensive> Slower

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Automated Testing

> Less human error> Faster!> Decreasing costs

> Learning curve

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Legacy New/Improved

Design Patterns

S.O.L.I.D.

TDD

Refactor

Restructure

• SRP• OCP• LSP• ISP• DIP

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Continuous Integration with Agile/Scrum

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Getting Started

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Unit Testing Frameworks

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Types of Automated Tests

Unit Tests

Integration Tests

UI Tests

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xUnit.net Test Extensions1. Click Tools Extensions and Updates

2. Search for xunit and install it

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Test Project In Solution Explorer:

1. Create “test” folder2. Right-click “test”3. Click Add4. Click New Project

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Add New Project

Select Class Libraryunder Visual C#

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xUnit.net Config (Test Project)

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xUnit.net Config (App Project)

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References in Test Project

xUnit.net references

Web App being tested

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Writing and Running

Tests

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Test Class Attributespublic test class [Fact] for public methods without parameters

[Theory] and [InlineData] for methods with parameters

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Test Explorer

Build Solution

Run Tests in Test Explorer

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Assert.Equal( ) for Returned Values

Verify actual result against expected result

Note “var” keyword

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Assert.Equal( ) for View Names

Verify that expected view equal to returned view

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Assert.Throws<Exception>()

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Theory/Fact(Skip=“Reason”)]

Temporarily ignore tests with an optional message.

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Testing Your Controllers

Correct Views?

Redirect to URL?

Correct Models

?

HTTP Code

?Mock

Depen-dencie

s!

Model Populate

d?

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DependencyInjection

& Mocking

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Decouple Your Dependencies

Dependency

Injection

Inversion of Control

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Set Up Dependency InjectionIn Startup: Add namespace and dependencies

In Application Code:• Constructor Injection• Setter Injection

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Moq in Test Project Config

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Moq Reference (Test Project)

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Mocking TermsMocks

Pre-programmed with expected results, doesn’t actually connect to DB, behavior verification.

FakesWorking examples, but not production-ready(e..g in-memory database)

Stubs

Provides canned answers

Reference: http://martinfowler.com/articles/mocksArentStubs.html

http://martinfowler.com/articles/mocksArentStubs.html
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Mocking Example

HINT: Use mock.Object to get mocked object.

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Demo

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What’s Next?

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What About Human Testers?

Smoke Tests

New Features

Edge Cases

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Cost of Unit Tests

Cost of Adding Unit

Tests

Cost of Not Having Unit

Tests

Bugs

Features

Expenses

less

no confidence, no time!

reduced piling up

more

more

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Improve Your Software ArchitectureViews & ViewModels

Controllers

Service Layer

Repository LayerEntity Framework

(ORM) SQL Server (database)

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Functional UI Testing

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Code Coverage and Continuous Integration

60 to 80% coverage ok?

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Integration Tests

• Databases

• File Systems

• Network Resources

• Web Requests & Responses

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In Review: Session Objectives And TakeawaysSession Objective(s): Explain why you would need automated testsPlan a more robust software architecture Implement automated testing for web apps

Automated tests provide the confidence needed to add new features to software while minimizing bugsNot having any automated tests will actually cost you more in the long run

Page 42: ASP.NET Core Unit Testing

Agenda

Background> Getting Started > Writing and Running Tests> Dependency Injection & Mocking

What’s Next?

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Contact

Email: [email protected] Twitter: @shahedC

mailto:[email protected]
http://twitter.com/shahedc

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