Asserting on the Number of Items in a Collection with NUnit Asserts
var names = new [ ] { " Sarah" , " Amrit" , " Amanda" , " Sarah" } ;
Assert. That ( names, Has. Exactly ( 4 ) . Items) ; // pass
Assert. That ( names, Is. Empty) ; // fail
Assert. That ( names, Is. Not. Empty) ; // pass
Asserting That All Items in a Collection are Unique with NUnit Asserts
Assert. That ( names, Is. Unique) ; // fail - 2 Sarah items exist
Asserting That An Item Does or Does Not Exist in a Collection with NUnit Asserts
Assert. That ( names, Contains. Item ( " Sarah" ) ) ; // pass
// Alternative syntax
Assert. That ( names, Does. Contain ( " Sarah" ) ) ; // pass
Assert. That ( names, Does. Not. Contain ( " Arnold" ) ) ; // pass
Asserting That An Item Appears a Specified Number Of Times in a Collection with NUnit Asserts
Assert. That ( names, Has. Exactly ( 1 ) . EqualTo ( " Sarah" ) ) ; // fail
Assert. That ( names, Has. Exactly ( 2 ) . EqualTo ( " Sarah" ) ) ; // pass
Assert. That ( names, Has. Exactly ( 2 ) . EqualTo ( " Sarah" )
. And. Exactly ( 1 ) . EqualTo ( " Amrit" ) ) ; // pass
Asserting That All Items In a Collections Satisfy a Predicate/Condition with NUnit Asserts
Assert. That ( names, Is. All. Not. Null) ; // pass
Assert. That ( names, Is. All. Contains ( " a" ) ) ; // fail lowercase a
Assert. That ( names, Is. All. Contains ( " a" ) . IgnoreCase) ; // pass
Assert. That ( names, Is. All. Matches < string > ( name => name. ToUpperInvariant ( ) . Contains ( " A" ) ) ) ; // pass
Assert. That ( names, Is. All. Matches < string > ( name => name. Length > 4 ) ) ; // pass
Asserting That Only One Item In a Collection Satisfies a Predicate with NUnit Asserts
Assert. That ( names, Has. Exactly ( 1 ) . Matches < string > ( name => name. Contains ( " mri" ) ) ) ; // pass
Assert. That ( names, Has. Exactly ( 1 ) . Matches < string > ( name => name. Contains ( " ara" ) ) ) ; // fail (2 Sarah items exist)