Test Abstractions

Basic test-class implementations and abstractions that simplify the most common test cases for xUnit testing.

Current Status

• Features
• Installation
• Usage
  • TestBase Class
  • Test Loggers
  • Property Comparison
  • Auto Properties
  • File Cleanup
  • STA Test Support
• Requirements
• License
• Contributing

Features

This library provides a collection of utilities and abstractions to simplify unit testing with xUnit:

• TestBase Class: Base class with common test utilities and helper methods
• Test Loggers: Implementation of ILogger and ILogger<T> for testing logging scenarios
• Property Comparison: Deep property comparison utilities using reflection
• Auto Properties: Automatic property generation with random values for testing
• File Cleanup: Automatic test file cleanup on test completion
• String Extensions: Test-specific string manipulation utilities
• STA Test Support: Support for Single-Threaded Apartment mode tests (Windows only)
• Fail Test Helpers: Convenient methods to fail tests with custom messages

Installation

NuGet Package

For standard testing:

dotnet add package ErikForwerk.TestAbstractions

For Windows STA (Single-Threaded Apartment) testing:

dotnet add package ErikForwerk.TestAbstractions.STA

Or via NuGet Package Manager:

Install-Package ErikForwerk.TestAbstractions
Install-Package ErikForwerk.TestAbstractions.STA

Usage

TestBase Class

Inherit from TestBase to access common test utilities:

using ErikForwerk.TestAbstractions.Models;
using Xunit;
using Xunit.Abstractions;

public class MyTests : TestBase
{
    public MyTests(ITestOutputHelper output) : base(output)
    {
    }

    [Fact]
    public void TestExample()
    {
        // Use TestConsole for output
        TestConsole.WriteLine("Test output");
        
        // Use B() method for bracketed string representation
        var result = B("value"); // Returns "[value]"
        var nullValue = B(null); // Returns "<null>"
    }
}

Test Loggers

Use TestLogger to capture and verify log messages:

using ErikForwerk.TestAbstractions.Models;
using Microsoft.Extensions.Logging;

public class MyServiceTests : TestBase
{
    public MyServiceTests(ITestOutputHelper output) : base(output)
    {
    }

    [Fact]
    public void TestLogging()
    {
        var logger = GetTestLogger();
        var service = new MyService(logger);
        
        service.DoSomething();
        
        // Verify logged messages
        Assert.Contains("Expected message", logger.LogMessages);
    }
}

Property Comparison

Use CompareHelper to deeply compare object properties:

using ErikForwerk.TestAbstractions.Tools;

[Fact]
public void TestObjectComparison()
{
    var expected = new MyClass { Property1 = "value1", Property2 = 42 };
    var actual = new MyClass { Property1 = "value1", Property2 = 42 };
    
    // Assert all properties are equal
    CompareHelper.AssertEqual(expected, actual, TestConsole);
    
    // Or assert all properties are different
    var different = new MyClass { Property1 = "other", Property2 = 99 };
    CompareHelper.AssertCompletelyUnequal(expected, different, TestConsole);
}

Auto Properties

Generate random property values for testing:

using ErikForwerk.TestAbstractions.Tools;

[Fact]
public void TestWithRandomData()
{
    var autoProps = new AutoProperties();
    
    // Generate random GUID
    var guid = autoProps.GenerateGuid();
    
    // Generate random string
    var randomString = autoProps.GenerateString();
    
    // Get random enum value
    var randomStatus = autoProps.GetRandomEnum<MyStatus>();
}

File Cleanup

Automatically clean up test files after test execution:

[Fact]
public void TestWithFileCleanup()
{
    var testFile = Path.GetTempFileName();
    
    using (CreateTestFileCleanUp(testFile))
    {
        // Work with the file
        File.WriteAllText(testFile, "test data");
        
        // File will be automatically deleted when disposed
    }
}

STA Test Support

For Windows applications requiring Single-Threaded Apartment mode:

using ErikForwerk.TestAbstractions.STA.Models;

public class MyStaTests : StaTestBase
{
    public MyStaTests(ITestOutputHelper output) : base(output)
    {
    }

    [Fact]
    public void TestInStaMode()
    {
        // Test code that requires STA thread
    }
}

Requirements

• .NET 9.0 or higher
• xUnit 2.9.3 or higher
• Microsoft.Extensions.Logging.Abstractions 9.0.10 or higher

For STA package:

• Windows operating system
• .NET 9.0-windows or higher

License

This project is licensed under the MIT License - see the LICENSE file for details.

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.