Values

Describes the possible expectations for single values, from bool and numbers to strings, streams and any object.

Page	Expectations
Boolean	IsTrue, IsFalse, Implies
Number	IsEqualTo, IsGreaterThan, IsBetween, IsPositive, IsNaN, Within
String	IsEqualTo with wildcards or regex, StartsWith, Contains, HasLength
Char	IsEqualTo, categories like IsALetter or IsWhiteSpace
Enum	IsEqualTo, HasValue, IsDefined, HasFlag
Guid	IsEqualTo, IsEmpty, IsNullOrEmpty
Version	IsEqualTo, IsGreaterThan, IsBetween, HasMajor
Stream	IsReadable, IsSeekable, HasLength, HasPosition
TimeSpan	IsEqualTo, IsGreaterThan, IsBetween, IsPositive, Within
DateTime / DateTimeOffset	IsEqualTo, IsAfter, IsBefore, IsBetween, HasYear, Within
DateOnly / TimeOnly	IsEqualTo, IsAfter, IsBefore, IsBetween, HasYear
Object	IsEqualTo, IsSameAs, Is<T>, IsNull, Satisfies, CompliesWith
Equivalency	IsEquivalentTo and its options

A few rules apply to all of these pages:

• A null subject fails every expectation that inspects it, and its negation as well, as the rule for null subjects describes.
• The Has… expectations, such as HasLength() or HasYear(), continue with a comparison like GreaterThan or Between, as shown for the length of a string.
• The options page lists the options that several expectations share, e.g. a tolerance with Within or the string options.