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    DictionaryContainsKey Constraint

    DictionaryContainsKeyConstraint is used to test whether a dictionary contains an expected object as a key.

    Constructor

    DictionaryContainsKeyConstraint(object)
    

    Syntax

    Contains.Key(object)
    Does.ContainKey(object)
    Does.Not.ContainKey(object)
    

    Modifiers

    ...WithValue(object expectedValue)
    

    As of version 4.4.0 of NUnit the other modifiers were removed as they were non-functional. NUnit's ContainKey works the same as the ContainsKey method on Dictionary It uses the comparer specified when the dictionary was created.

    Examples of Use

    var caseSensitiveDictionary = new Dictionary<string, string>(StringComparer.Ordinal)
    {
        ["Hello"] = "World",
    };
    
    Assert.That(caseSensitiveDictionary, Does.ContainKey("Hello"));
    Assert.That(caseSensitiveDictionary, Does.Not.ContainKey("hello"));
    
    var caseInsensitiveDictionary = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
    {
        ["Hello"] = "World",
    };
    
    Assert.That(caseInsensitiveDictionary, Does.ContainKey("Hello"));
    Assert.That(caseInsensitiveDictionary, Does.ContainKey("hello"));
    Assert.That(caseInsensitiveDictionary, Does.Not.ContainKey("hallo"));
    
    // Note that the 'IgnoreCase' here is on the Value part, not the Key.
    Assert.That(caseInsensitiveDictionary, Does.ContainKey("hello").WithValue("world").IgnoreCase);
    

    See also

    • DictionaryContainsValueConstraint
    • DictionaryContainsKeyValuePairConstraint
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