Is there a fluent assertion API for MSTest?

Question

I've recently been exposed to the fluent interface in nUnit and I love it; however, I am using msTest.

Does anyone know if there is a fluent interface that is either testing framework agnostic or for msTest?

Answer 1

See Fluent Assertions. You can do stuff like

"ABCDEFGHI".Should().StartWith("AB").And.EndWith("HI").And.Contain("EF").And.HaveLength(9);

new[] { 1, 2, 3 }.Should().HaveCount(4, "because we thought we put three items in the 
collection"))

dtoCollection.Should().Contain(dto => dto.Id != null);

collection.Should().HaveCount(c => c >= 3);

dto.ShouldHave().AllPropertiesBut(d => d.Id).EqualTo(customer);

dt1.Should().BeWithin(TimeSpan.FromHours(50)).Before(dt2); 

Action action = () => recipe.AddIngredient("Milk", 100, Unit.Spoon);
action
   .ShouldThrow<RuleViolationException>()
   .WithMessage("Cannot change the unit of an existing ingredient")
   .And.Violations.Should().Contain(BusinessRule.CannotChangeIngredientQuanity

Answer 2

See http://sharptestex.codeplex.com/

NOTE: SharpTestsEx appears to no longer be actively developed, recommended alternative is http://www.fluentassertions.com/.

SharpTestsEx (Sharp Tests Extensions) is a set of extensible extensions. The main target is to write short assertions where the Visual Studio IDE intellisense is your guide. #TestsEx can be used with NUnit, MsTests, xUnit, MbUnit... even in Silverlight.

Syntax example for strongly typed assertions (taken from webpage):

true.Should().Be.True();
false.Should().Be.False();

const string something = "something";
something.Should().Contain("some");
something.Should().Not.Contain("also");
something.ToUpperInvariant().Should().Not.Contain("some");

something.Should()
    .StartWith("so")
    .And
    .EndWith("ing")
    .And
    .Contain("meth");

something.Should()
    .Not.StartWith("ing")
    .And
    .Not.EndWith("so")
    .And
    .Not.Contain("body");

var ints = new[] { 1, 2, 3 };
ints.Should().Have.SameSequenceAs(new[] { 1, 2, 3 });
ints.Should().Not.Have.SameSequenceAs(new[] { 3, 2, 1 });
ints.Should().Not.Be.Null();
ints.Should().Not.Be.Empty();

ints.Should()
    .Contain(2)
    .And
    .Not.Contain(4);

(new int[0]).Should().Be.Empty();

Answer 3

Based on my research there isn't one, but if your willing to sacrifice the better reportability as far as why an assert failed and willing to add a new dll you can reference nunit and use theirs....