TestCaseSource now ignore all classes derived from TestCaseParameters

Author: manfred-brands

src/nunit.analyzers.tests/Constants/NUnitFrameworkConstantsTests.cs

@@ -6,6 +6,7 @@
 using NUnit.Framework;
 using NUnit.Framework.Constraints;
 using NUnit.Framework.Interfaces;
+using NUnit.Framework.Internal;
 
 namespace NUnit.Analyzers.Tests.Constants
 {
@@ -140,6 +141,7 @@ public sealed class NUnitFrameworkConstantsTests
             (nameof(NUnitFrameworkConstants.FullNameOfTypeISimpleTestBuilder), typeof(ISimpleTestBuilder)),
             (nameof(NUnitFrameworkConstants.FullNameOfTypeIParameterDataSource), typeof(IParameterDataSource)),
             (nameof(NUnitFrameworkConstants.FullNameOfTypeTestCaseData), typeof(TestCaseData)),
+            (nameof(NUnitFrameworkConstants.FullNameOfTypeTestCaseParameters), typeof(TestCaseParameters)),
 
             (nameof(NUnitFrameworkConstants.FullNameOfTypeOneTimeSetUpAttribute), typeof(OneTimeSetUpAttribute)),
             (nameof(NUnitFrameworkConstants.FullNameOfTypeOneTimeTearDownAttribute), typeof(OneTimeTearDownAttribute)),

src/nunit.analyzers.tests/TestCaseSourceUsage/TestCaseSourceUsesStringAnalyzerTests.cs

@@ -658,6 +658,7 @@ static IEnumerable<object> TestData()
         [TestCase("IEnumerable", "object", "System.Collections")]
         [TestCase("IEnumerable<object>", "object", "System.Collections.Generic")]
         [TestCase("IEnumerable<TestCaseData>", "TestCaseData", "System.Collections.Generic")]
+        [TestCase("IEnumerable<TestCaseParameters>", "TestCaseParameters", "System.Collections.Generic; using NUnit.Framework.Internal")]
         [TestCase("IEnumerable<int>", "int", "System.Collections.Generic")]
         public void NoIssueIsRaisedWhenOneParameterIsExpectedAndTypeCannotBeDetermined(string enumerableType, string testCaseType, string collections)
         {
@@ -681,6 +682,7 @@ public void ShortName(int n)
         [TestCase("IEnumerable", "object", "System.Collections")]
         [TestCase("IEnumerable<object>", "object", "System.Collections.Generic")]
         [TestCase("IEnumerable<TestCaseData>", "TestCaseData", "System.Collections.Generic")]
+        [TestCase("IEnumerable<TestCaseParameters>", "TestCaseParameters", "System.Collections.Generic; using NUnit.Framework.Internal")]
         public void NoIssueIsRaisedWhenMultipleParameterAreExpectedAndTypeCannotBeDetermined(string enumerableType, string testCaseType, string collections)
         {
             var testCode = TestUtility.WrapClassInNamespaceAndAddUsing($@"

src/nunit.analyzers/Constants/NUnitFrameworkConstants.cs

@@ -108,6 +108,7 @@ public static class NUnitFrameworkConstants
         public const string FullNameOfTypeValueSourceAttribute = "NUnit.Framework.ValueSourceAttribute";
         public const string FullNameOfTypeIParameterDataSource = "NUnit.Framework.Interfaces.IParameterDataSource";
         public const string FullNameOfTypeTestCaseData = "NUnit.Framework.TestCaseData";
+        public const string FullNameOfTypeTestCaseParameters = "NUnit.Framework.Internal.TestCaseParameters";
 
         public const string FullNameOfTypeOneTimeSetUpAttribute = "NUnit.Framework.OneTimeSetUpAttribute";
         public const string FullNameOfTypeOneTimeTearDownAttribute = "NUnit.Framework.OneTimeTearDownAttribute";

src/nunit.analyzers/TestCaseSourceUsage/TestCaseSourceUsesStringAnalyzer.cs

@@ -226,7 +226,7 @@ private static void AnalyzeAttribute(SyntaxNodeAnalysisContext context)
                             var (methodRequiredParameters, methodOptionalParameters, methodParamsParameters) = testMethod.GetParameterCounts();
 
                             if (elementType.SpecialType != SpecialType.System_String && (elementType.SpecialType == SpecialType.System_Object || elementType.IsIEnumerable(out _) ||
-                                SymbolEqualityComparer.Default.Equals(elementType, context.SemanticModel.Compilation.GetTypeByMetadataName(NUnitFrameworkConstants.FullNameOfTypeTestCaseData))))
+                                IsOrDerivesFrom(elementType, context.SemanticModel.Compilation.GetTypeByMetadataName(NUnitFrameworkConstants.FullNameOfTypeTestCaseParameters))))
                             {
                                 // We only know that there is 1 or (likely) more parameters.
                                 // The object could hide an array, possibly with a variable number of elements: TestCaseData.Argument.
@@ -306,5 +306,27 @@ private static void ReportIfParametersSupplied(
                     kind));
             }
         }
+
+        private static bool IsOrDerivesFrom(ITypeSymbol type, ITypeSymbol? baseType)
+        {
+            if (baseType is null)
+            {
+                return false;
+            }
+
+            ITypeSymbol? typeAtHand = type;
+            do
+            {
+                if (SymbolEqualityComparer.Default.Equals(typeAtHand, baseType))
+                {
+                    return true;
+                }
+
+                typeAtHand = typeAtHand.BaseType;
+            }
+            while (typeAtHand is not null);
+
+            return false;
+        }
     }
 }