Binary Studio Academy: .NET Code Testing

Oct 27, 2016Download as PPTX, PDF1 like267 views

This document discusses code testing and provides recommendations for effective testing practices. It covers what tests are, why they are important, what should be tested, naming conventions, popular testing frameworks, test characteristics, types of tests, testable code principles, mocking libraries, test-driven development, test coverage, continuous integration, and behavior-driven development. Recommendations include testing all code, common and edge cases, using the AAA pattern (Arrange-Act-Assert), writing small independent tests, and leveraging tools to automate testing.

.NET Code Testing
by Kirill M.
1
binary-studio.com

What is test?
Test – code that verifies your code.
Test – specification that tells what should be expected.
Expected
result
Coffee beans
Water
Coffee
Input
parameters
Your code,
some logic
X
Y
Z
2

Why to write tests?
• Easy project development and maintenance
• High code reliability
• Testing automation
• Safe code refactoring
• High quality code
3

What to test?
• Test your code
• Test everything that could possibly break
• Test common and edge cases
• Write test that covers the code with bug before fixing it
4

Recommended name conventions
A separate project for tests: [module].Tests.csproj
A class with tests for only one target class: public class [target_class]Tests
Test’s name shows what test verifies and what is expected:
public void [target_method]_When_..._Then_...()
public void [target_method]_Should_..._When_...()
Conditions
Expected result
AAA pattern: Arrange-Act-Assert
5

Popular unit-testing frameworks
NUnit
Microsoft Unit Testing Framework
xUnit
http://www.nunit.org/
https://msdn.microsoft.com/en-us/library/ms243147.aspx
http://xunit.github.io/
6

Test should be…
• easy to write
• simple to understand
• small
• easy to run and automate
• independent and all-sufficient
• ready to run in parallel… ideally
7

Test types
Unit-tests
Integration tests
UI tests
Acceptance tests
For development team
For customer
Developers
QA
Customer / QA
Code
Scripts / code
User stories
8

Testable code
9
• SOLID principle
• each unit does one concrete task
• loosely coupled units
• Small understandable units
• Dependency Injection (DI) pattern
• Only few dependencies
• Logic is separated from the data resources
• Interfaces

How to test?
Test
State Behavior
Stub Mock
10

Popular mocking libraries
Moq
http://www.moqthis.com/
NSubstitute
http://nsubstitute.github.io/
FakeItEasy
http://fakeiteasy.github.io/
Rhino Mocks
http://www.hibernatingrhinos.com/oss/rhino-mocks
11

Test Driven Development (TDD)
Run
tests
Add a
test
Write
code
Fix code
12

Test coverage
Shows what code is executed in tests.
Popular tools:
• JetBrains dotCover
• Built-in tool in Visual Studio Premium / Ultimate
• NCover
• OpenCover (free)
• NCrunch
13

Continuous Integration
CI servers automate tests execution and
notify developers about failures.
Demo on https://teamcity.jetbrains.com/?guest=1
14

Behavior Driven Development (BDD)
15
BDD
TDD Acceptance tests
In contrast to TDD, BDD provides a specification what should be tested.
Given-When-Then (GWT) pattern:
Given some context
When some action is carried out
Then a particular set of observable consequences should obtain
Popular tools:
• SpecFlow
• NSpec

Homework
16
Repository with lecture presentation and code examples:
https://github.com/BinaryStudioAcademy/NET_CodeTesting
Tasks: Homework.txt in the root of repository.
Read README.txt files in the projects for help.

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