DictionaryContainsValue Constraint

DictionaryContainsValueConstraint tests whether a dictionary contains an expected value.

Usage

Contains.Value(object expectedValue)
Does.ContainValue(object expectedValue)
Does.Not.ContainValue(object expectedValue)

Modifiers

.IgnoreCase
.Using(IComparer comparer)
.Using(IEqualityComparer comparer)
.Using<T>(IComparer<T> comparer)
.Using<T>(IEqualityComparer<T> comparer)
.Using<T>(Comparison<T> comparer)
.Using<T>(Func<T, T, bool> comparer)
.UsingPropertiesComparer()     // NUnit 4.1+

Examples

[Test]
public void DictionaryContainsValueConstraint_Examples()
{
    var scores = new Dictionary<string, int>
    {
        ["Alice"] = 100,
        ["Bob"] = 85,
        ["Carol"] = 100
    };

    // Basic value checks
    Assert.That(scores, Contains.Value(100));
    Assert.That(scores, Does.ContainValue(85));
    Assert.That(scores, Does.Not.ContainValue(50));

    // String values with case-insensitive comparison
    var names = new Dictionary<int, string>
    {
        [1] = "Alice",
        [2] = "Bob"
    };
    Assert.That(names, Does.ContainValue("alice").IgnoreCase);
}

Notes

  1. Unlike key comparison, value comparison can use NUnit's comparison modifiers.
  2. The constraint checks if any value in the dictionary matches.

See Also