HLQ004_RefEnumerationVariableAnalyzerTests.cs

public class RefEnumerationVariableAnalyzerTests : CodeFixVerifier
{
    protected override DiagnosticAnalyzer GetCSharpDiagnosticAnalyzer() 
        => new RefEnumerationVariableAnalyzer();

    protected override CodeFixProvider GetCSharpCodeFixProvider()
        => new RefEnumerationVariableCodeFixProvider();

    [Theory]
    [InlineData("TestData/HLQ004/NoDiagnostic/NoRef.cs")]
    [InlineData("TestData/HLQ004/NoDiagnostic/Ref.cs")]
    [InlineData("TestData/HLQ004/NoDiagnostic/RefReadOnly.cs")]
    public void Verify_NoDiagnostics(string path)
    {
        var paths = new[]
        {
            path,
            "TestData/TestType.cs",
            "TestData/Enumerable.cs",
            "TestData/HLQ004/RefEnumerables.cs",
        };
        var sources = paths.Select(path => File.ReadAllText(path)).ToArray();

        VerifyCSharpDiagnostic(sources);
    }

    [Theory]
    [InlineData("TestData/HLQ004/Diagnostic/Ref.cs", "ref", "TestData/HLQ004/Diagnostic/Ref.Fix.cs", 7, 22)]
    [InlineData("TestData/HLQ004/Diagnostic/RefReadOnly.cs", "ref readonly", "TestData/HLQ004/Diagnostic/RefReadOnly.Fix.cs", 9, 22)]
    public void Verify_Diagnostics(string path, string message, string fix, int line, int column)
    {
        var paths = new[]
        {
            path,
            "TestData/TestType.cs",
            "TestData/Enumerable.cs",
            "TestData/HLQ004/RefEnumerables.cs",
        };
        var sources = paths.Select(path => File.ReadAllText(path)).ToArray();
        var expected = new DiagnosticResult
        {
            Id = "HLQ004",
            Message = $"The enumerator returns a reference to the item. Add '{message}' to the item type.",
            Severity = DiagnosticSeverity.Warning,
            Locations = new[] {
                new DiagnosticResultLocation("Test0.cs", line, column)
            },
        };

        VerifyCSharpDiagnostic(sources, expected);

        VerifyCSharpFix(sources, File.ReadAllText(fix));
    }
}