Fix MSTEST0057 false positive on static constructors (#6937)

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: Youssef1313 <[email protected]>
Co-authored-by: Youssef Victor <[email protected]>

Author: Copilot

src/Analyzers/MSTest.Analyzers/TestMethodAttributeShouldPropagateSourceInformationAnalyzer.cs

@@ -66,7 +66,7 @@ private static void AnalyzeSymbol(SymbolAnalysisContext context, INamedTypeSymbo
             return;
         }
 
-        foreach (IMethodSymbol constructor in namedTypeSymbol.Constructors)
+        foreach (IMethodSymbol constructor in namedTypeSymbol.InstanceConstructors)
         {
             // Check if constructor has CallerFilePath and CallerLineNumber parameters
             bool hasCallerFilePath = false;

test/UnitTests/MSTest.Analyzers.UnitTests/TestMethodAttributeShouldPropagateSourceInformationAnalyzerTests.cs

@@ -481,4 +481,88 @@ public DerivedTestMethodAttribute([CallerFilePath] string callerFilePath = "", [
 
         await VerifyCS.VerifyCodeFixAsync(code, code);
     }
+
+    [TestMethod]
+    public async Task WhenDerivedTestMethodAttributeWithStaticConstructor_NoDiagnostic()
+    {
+        string code = """
+            using Microsoft.VisualStudio.TestTools.UnitTesting;
+            using System.Runtime.CompilerServices;
+
+            public class MyTestMethodAttribute : TestMethodAttribute
+            {
+                static MyTestMethodAttribute()
+                {
+                }
+
+                public MyTestMethodAttribute([CallerFilePath] string callerFilePath = "", [CallerLineNumber] int callerLineNumber = -1)
+                    : base(callerFilePath, callerLineNumber)
+                {
+                }
+            }
+            """;
+
+        await VerifyCS.VerifyCodeFixAsync(code, code);
+    }
+
+    [TestMethod]
+    public async Task WhenDerivedTestMethodAttributeWithStaticField_NoDiagnostic()
+    {
+        string code = """
+            using Microsoft.VisualStudio.TestTools.UnitTesting;
+            using System;
+            using System.Runtime.CompilerServices;
+
+            public class MyTestMethodAttribute : TestMethodAttribute
+            {
+                static DateTimeOffset s_field = new();
+
+                public MyTestMethodAttribute([CallerFilePath] string callerFilePath = "", [CallerLineNumber] int callerLineNumber = -1)
+                    : base(callerFilePath, callerLineNumber)
+                {
+                }
+            }
+            """;
+
+        await VerifyCS.VerifyCodeFixAsync(code, code);
+    }
+
+    [TestMethod]
+    public async Task WhenDerivedTestMethodAttributeWithStaticConstructorAndMissingCallerInfo_Diagnostic()
+    {
+        string code = """
+            using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+            public class SomeTestMethodAttribute : TestMethodAttribute
+            {
+                static SomeTestMethodAttribute()
+                {
+                }
+
+                public [|SomeTestMethodAttribute|]()
+                    : base()
+                {
+                }
+            }
+            """;
+
+        string fixedCode = """
+            using System.Runtime.CompilerServices;
+            using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+            public class SomeTestMethodAttribute : TestMethodAttribute
+            {
+                static SomeTestMethodAttribute()
+                {
+                }
+
+                public SomeTestMethodAttribute([CallerFilePath] string callerFilePath = "", [CallerLineNumber] int callerLineNumber = -1)
+                    : base(callerFilePath, callerLineNumber)
+                {
+                }
+            }
+            """;
+
+        await VerifyCS.VerifyCodeFixAsync(code, fixedCode);
+    }
 }