Don't report REFL026 when interface types is given

Author: iqv-csis

ReflectionAnalyzers.Tests/REFL026MissingDefaultConstructorTests/Valid.cs

@@ -149,5 +149,32 @@ public class C
 
             RoslynAssert.Valid(Analyzer, Descriptor, code);
         }
+
+        [Test]
+        public static void WhenOnInterfaceTypes()
+        {
+            var code = @"
+namespace N
+{
+    using System;
+
+    public interface A { }
+
+    public class B : A
+    {
+        public B() { }
+    }
+
+    public class C
+    {
+        public C(A a)
+        {
+            var foo = (A?)Activator.CreateInstance(a.GetType());
+        }
+    }
+}";
+
+            RoslynAssert.Valid(Analyzer, Descriptor, code);
+        }
     }
 }

ReflectionAnalyzers/NodeAnalzers/ActivatorAnalyzer.cs

@@ -104,6 +104,9 @@ private static bool TryGetCreatedType(IMethodSymbol createInstance, InvocationEx
 
         private static bool IsMissingDefaultConstructor(IMethodSymbol createInstance, InvocationExpressionSyntax invocation, INamedTypeSymbol createdType)
         {
+            if (createdType.TypeKind == TypeKind.Interface)
+                return false;
+
             if (createInstance.IsGenericMethod &&
                 !HasDefaultConstructor())
             {