CollectionContains Constraint

CollectionContainsConstraint tests that an IEnumerable contains an object. If the actual value passed does not implement IEnumerable, an exception is thrown.

Constructor

CollectionContainsConstraint(object)

Syntax

Has.Member(object)
Contains.Item(object)
Does.Contain(object)

Modifiers

...Using(IComparer comparer)
...Using<T>(IComparer<T> comparer)
...Using<T>(Comparison<T> comparer)

Examples of Use

[Test]
public void CollectionContains_Examples()
{
    int[] intArray = [1, 2, 3];
    string[] stringArray = ["a", "b", "c"];
    
    Assert.That(intArray, Has.Member(3));
    Assert.That(stringArray, Has.Member("b"));
    Assert.That(stringArray, Contains.Item("c"));
    Assert.That(stringArray, Has.No.Member("x"));
    Assert.That(intArray, Does.Contain(3));
}

Note

Has.Member(), Contains.Item() and Does.Contain() work the same as Has.Some.EqualTo(). The last statement generates a SomeItemsConstraint based on an EqualConstraint and offers additional options such as ignoring case or specifying a tolerance. The syntax on this page may be viewed as a shortcut for specifying simpler cases.