AssignmentBoxingTests.cs

public class AssignmentBoxingTests : DiagnosticVerifier
{
    protected override DiagnosticAnalyzer GetCSharpDiagnosticAnalyzer() =>
        new AssignmentBoxingAnalyzer();

    [Theory]
    [InlineData("TestData/HLQ001/NoDiagnostic/FieldDeclaration.cs")]
    [InlineData("TestData/HLQ001/NoDiagnostic/FieldDeclaration.Async.cs")]
    [InlineData("TestData/HLQ001/NoDiagnostic/PropertyDeclaration.cs")]
    [InlineData("TestData/HLQ001/NoDiagnostic/PropertyDeclaration.Async.cs")]
    [InlineData("TestData/HLQ001/NoDiagnostic/VariableDeclaration.cs")]
    [InlineData("TestData/HLQ001/NoDiagnostic/VariableDeclaration.Async.cs")]
    public void Verify_NoDiagnostics(string path)
    {
        VerifyCSharpDiagnostic(File.ReadAllText(path));
    }

    [Theory]
    [InlineData("TestData/HLQ001/Diagnostic/EqualsValueClause/FieldDeclaration.cs", "OptimizedEnumerable`1", "IEnumerable`1", 8, 9)]
    [InlineData("TestData/HLQ001/Diagnostic/EqualsValueClause/FieldDeclaration.Async.cs", "OptimizedAsyncEnumerable`1", "IAsyncEnumerable`1", 8, 9)]
    [InlineData("TestData/HLQ001/Diagnostic/EqualsValueClause/PropertyDeclaration.cs", "OptimizedEnumerable`1", "IEnumerable`1", 8, 9)]
    [InlineData("TestData/HLQ001/Diagnostic/EqualsValueClause/PropertyDeclaration.Async.cs", "OptimizedAsyncEnumerable`1", "IAsyncEnumerable`1", 8, 9)]
    [InlineData("TestData/HLQ001/Diagnostic/EqualsValueClause/VariableDeclaration.cs", "OptimizedEnumerable`1", "IEnumerable`1", 10, 13)]
    [InlineData("TestData/HLQ001/Diagnostic/EqualsValueClause/VariableDeclaration.Async.cs", "OptimizedAsyncEnumerable`1", "IAsyncEnumerable`1", 11, 13)]
    [InlineData("TestData/HLQ001/Diagnostic/SimpleAssignment/FieldDeclaration.cs", "OptimizedEnumerable`1", "IEnumerable`1", 12, 13)]
    [InlineData("TestData/HLQ001/Diagnostic/SimpleAssignment/FieldDeclaration.Async.cs", "OptimizedAsyncEnumerable`1", "IAsyncEnumerable`1", 12, 13)]
    [InlineData("TestData/HLQ001/Diagnostic/SimpleAssignment/PropertyDeclaration.cs", "OptimizedEnumerable`1", "IEnumerable`1", 12, 13)]
    [InlineData("TestData/HLQ001/Diagnostic/SimpleAssignment/PropertyDeclaration.Async.cs", "OptimizedAsyncEnumerable`1", "IAsyncEnumerable`1", 12, 13)]
    [InlineData("TestData/HLQ001/Diagnostic/SimpleAssignment/VariableDeclaration.cs", "OptimizedEnumerable`1", "IEnumerable`1", 12, 13)]
    [InlineData("TestData/HLQ001/Diagnostic/SimpleAssignment/VariableDeclaration.Async.cs", "OptimizedAsyncEnumerable`1", "IAsyncEnumerable`1", 13, 13)]
    public void Verify_Diagnostics(string path, string type, string @interface, int line, int column)
    {
        var expected = new DiagnosticResult
        {
            Id = "HLQ001",
            Message = $"'{type}' has a value type enumerator. Assigning it to '{@interface}' causes boxing of the enumerator.",
            Severity = DiagnosticSeverity.Warning,
            Locations = new[] {
                new DiagnosticResultLocation("Test0.cs", line, column)
            },
        };

        VerifyCSharpDiagnostic(File.ReadAllText(path), expected);
    }
}