Unit Testing with xUnit

xUnit is one of the most widely used C# testing frameworks — a test method is any method annotated [Fact]:

public class CalculatorTests {
    [Fact]
    public void AddsTwoNumbers() {
        var calc = new Calculator();
        Assert.Equal(5, calc.Add(2, 3));
    }

    [Fact]
    public void DivisionByZeroThrows() {
        var calc = new Calculator();
        Assert.Throws<DivideByZeroException>(() => calc.Divide(1, 0));
    }
}

dotnet test

Directly parallel to Java's JUnit @Test — dotnet test (like mvn test) discovers and runs every [Fact]-annotated method automatically.