AutoFixture

AutoFixture is a library used for automatic generation of test data in unit tests. It helps reduce the manual effort required to create dummy objects or input data for tests by automatically creating meaningful and valid data.

using AutoFixture;
using Xunit;

public class MyTests
{
    [Fact]
    public void Test_With_AutoFixture()
    {
        // Arrange
        var fixture = new Fixture();
        var user = fixture.Create<User>();

        // Act
        bool isValid = user.IsValid();

        // Assert
        Assert.True(isValid);
    }
}

AutoData

[AutoData] is an attribute provided by AutoFixture that integrates with xUnit to automatically inject generated test data into test methods.

using AutoFixture.Xunit2;
using Xunit;

public class MyTests
{
    [Theory]
    [AutoData]
    public void Test_With_AutoData(User user)
    {
        // Act
        bool isValid = user.IsValid();

        // Assert
        Assert.True(isValid);
    }
}

Using both AutoFixture and AutoData in one xUnit Test

using AutoFixture;
using AutoFixture.Xunit2;
using Xunit;

public class UserTests
{
    [Theory]
    [AutoData]
    public void Test_With_AutoData_And_Manual_Fixture(User autoUser)
    {
        // Create additional data manually using AutoFixture
        var fixture = new Fixture();
        var manualUser = fixture.Create<User>();

        // Act
        bool isAutoUserValid = autoUser.IsValid();
        bool isManualUserValid = manualUser.IsValid();

        // Assert
        Assert.True(isAutoUserValid);
        Assert.True(isManualUserValid);
    }
}