Boolean

Describes the possible expectations for bool and bool? values.

Expectation	Negated	Summary
IsEqualTo	IsNotEqualTo	equal to the expected value
IsTrue	IsNotTrue (only bool?)	true
IsFalse	IsNotFalse (only bool?)	false
IsNull	IsNotNull (only bool?)	null
Implies	DoesNotImply	false, or the other value is true

Equality

You can verify that the bool is equal to another one or not:

bool isPlayed = false;

await Expect.That(isPlayed).IsEqualTo(false);
await Expect.That(isPlayed).IsNotEqualTo(true);

True / False

You can verify that the bool is true or false:

await Expect.That(false).IsFalse();
await Expect.That(true).IsTrue();

Awaiting a bool without any expectation is a shorthand for IsTrue():

bool isInLibrary = true;

await Expect.That(isInLibrary);

The negations and the null checks are only available for a bool?:

bool? isPlayed = null;

await Expect.That(isPlayed).IsNotFalse()
  .Because("it could be true or null");
await Expect.That(isPlayed).IsNotTrue()
  .Because("it could be false or null");
await Expect.That(isPlayed).IsNull();

note

On a bool?, IsTrue() and IsFalse() compare the subject against true or false instead of inspecting it. Therefore null is treated as an ordinary value: IsNotTrue(), IsNotFalse() and DoesNotComplyWith(it => it.IsTrue()) succeed for a null subject.

Implication

You can verify that a implies b or not:

bool isPlayed = false;
bool isInLibrary = true;

await Expect.That(isPlayed).Implies(isInLibrary);
await Expect.That(isInLibrary).DoesNotImply(isPlayed);