github/csharp-nunit
plugins/testing-automation/skills/csharp-nunit/SKILL.md
Get best practices for NUnit unit testing, including data-driven tests
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SKILL.md
- name:
- csharp-nunit
- description:
- Get best practices for NUnit unit testing, including data-driven tests
NUnit Best Practices
Your goal is to help me write effective unit tests with NUnit, covering both standard and data-driven testing approaches.
Project Setup
- Use a separate test project with naming convention
[ProjectName].Tests - Reference Microsoft.NET.Test.Sdk, NUnit, and NUnit3TestAdapter packages
- Create test classes that match the classes being tested (e.g.,
CalculatorTestsforCalculator) - Use .NET SDK test commands:
dotnet testfor running tests
Test Structure
- Apply
[TestFixture]attribute to test classes - Use
[Test]attribute for test methods - Follow the Arrange-Act-Assert (AAA) pattern
- Name tests using the pattern
MethodName_Scenario_ExpectedBehavior - Use
[SetUp]and[TearDown]for per-test setup and teardown - Use
[OneTimeSetUp]and[OneTimeTearDown]for per-class setup and teardown - Use
[SetUpFixture]for assembly-level setup and teardown
Standard Tests
- Keep tests focused on a single behavior
- Avoid testing multiple behaviors in one test method
- Use clear assertions that express intent
- Include only the assertions needed to verify the test case
- Make tests independent and idempotent (can run in any order)
- Avoid test interdependencies
Data-Driven Tests
- Use
[TestCase]for inline test data - Use
[TestCaseSource]for programmatically generated test data - Use
[Values]for simple parameter combinations - Use
[ValueSource]for property or method-based data sources - Use
[Random]for random numeric test values - Use
[Range]for sequential numeric test values - Use
[Combinatorial]or[Pairwise]for combining multiple parameters
Assertions
- Use
Assert.Thatwith constraint model (preferred NUnit style) - Use constraints like
Is.EqualTo,Is.SameAs,Contains.Item - Use
Assert.AreEqualfor simple value equality (classic style) - Use
CollectionAssertfor collection comparisons - Use
StringAssertfor string-specific assertions - Use
Assert.Throws<T>orAssert.ThrowsAsync<T>to test exceptions - Use descriptive messages in assertions for clarity on failure
Mocking and Isolation
- Consider using Moq or NSubstitute alongside NUnit
- Mock dependencies to isolate units under test
- Use interfaces to facilitate mocking
- Consider using a DI container for complex test setups
Test Organization
- Group tests by feature or component
- Use categories with
[Category("CategoryName")] - Use
[Order]to control test execution order when necessary - Use
[Author("DeveloperName")]to indicate ownership - Use
[Description]to provide additional test information - Consider
[Explicit]for tests that shouldn't run automatically - Use
[Ignore("Reason")]to temporarily skip tests
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