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    NUnit2014

    Use SomeItemsConstraint for better assertion messages in case of failure

    Topic Value
    Id NUnit2014
    Severity Info
    Enabled True
    Category Assertion
    Code SomeItemsConstraintUsageAnalyzer

    Description

    Using SomeItemsConstraint will lead to better assertion messages in case of failure.

    Motivation

    Using Does.Contain (or Does.Not.Contain) constraint will lead to better assertion messages in case of failure, so this analyzer marks all usages of string Contains method where it is possible to replace with Does.Contain constraint.

    [Test]
    public void Test()
    {
        var actual = new List<int> {1,2,3};
        int expected = 1;
        ClassicAssert.True(actual.Contains(expected));
    }
    

    How to fix violations

    The analyzer comes with a code fix that will replace ClassicAssert.True(actual.Contains(expected)) with Assert.That(actual, Does.Contain(expected)). So the code block above will be changed into

    [Test]
    public void Test()
    {
        var actual = new List<int> {1,2,3};
        int expected = 1;
        Assert.That(actual, Does.Contain(expected));
    }
    

    Configure severity

    Via ruleset file

    Configure the severity per project, for more info see MSDN.

    Via .editorconfig file

    # NUnit2014: Use SomeItemsConstraint for better assertion messages in case of failure
    dotnet_diagnostic.NUnit2014.severity = chosenSeverity
    

    where chosenSeverity can be one of none, silent, suggestion, warning, or error.

    Via #pragma directive

    #pragma warning disable NUnit2014 // Use SomeItemsConstraint for better assertion messages in case of failure
    Code violating the rule here
    #pragma warning restore NUnit2014 // Use SomeItemsConstraint for better assertion messages in case of failure
    

    Or put this at the top of the file to disable all instances.

    #pragma warning disable NUnit2014 // Use SomeItemsConstraint for better assertion messages in case of failure
    

    Via attribute [SuppressMessage]

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Assertion",
        "NUnit2014:Use SomeItemsConstraint for better assertion messages in case of failure",
        Justification = "Reason...")]
    
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