A cheat sheet of Asserts for xUnit.net in C#

XUnitAsserts.cs

/*
    STRINGS
*/
Assert.Equal(expectedString, actualString);
Assert.StartsWith(expectedString, stringToCheck);
Assert.EndsWith(expectedString, stringToCheck);

// Some can also take optional params
Assert.Equal(expectedString, actualString, ignoreCase: true);
Assert.StartsWith(expectedString, stringToCheck, StringComparison.OrdinalIgnoreCase);

/*
    COLLECTIONS
*/
Assert.Contains(expectedThing, collection);
// Overload method for contains
Assert.Contains(collection, item => item.Contains(thingToCheck));
Assert.DoesNotContain(expectedThing, collection);
Assert.Empty(collection);
Assert.All(collection, item => Assert.False(string.IsNullOrWhiteSpace(item)));

/*
    NUMBERS
*/
Assert.InRange(thingToCheck, lowRange, highRange);

/*
    EXCEPTIONS
*/
Assert.Throws<T>(() => sut.Method());

/*
    TYPES
*/
Assert.IsType<T>(thing);
Assert.IsAssignableFrom<T>(thing);
Assert.Same(obj1, obj2);
Assert.NotSame(obj1, obj2);

/*
    COOL XUNIT STUFF
*/

// Inherit from the DataAttribute from xunit.sdk
public class CustomData : DataAttribute
{
		// Needs a method that returns an IEnumerable<object[]>
		public override IEnumerable<object[]> GetData(MethodInfo testMethod)
		{
				yield return new object[] { data1, data2, data3 };
				yield return new object[] { data4, data5, data6 };
		}
}

public class TestClass
{
		[Theory]
		[CustomData]
		public void TestMethod(param1, param2, param3)
		{
			// Test using the 3 params
		}
}

// Create the fixture to share
public class TestSetup : IDisposable
{
		// Some stuff here
}

public class TestClass : IClassFixture<TestSetup>
{
		public TestClass(TestSetup setup)
		{
			// Initialise setup to share across test methods
		}
}

// Create collection to share across test classes
[CollectionDefinition("Name of Collection")]
public class TestCollection : ICollectionFixture<TestSetup>
{
}

[Collection("Name of Collection")]
public class TestClass2
{
		public TestClass2(TestSetup setup)
		{
			// Initialise setup
		}
}