Add failing test for unexpected behaviour from issue #4558

Author: MDoerner

RubberduckTests/Inspections/IllegalAnnotationsInspectionTests.cs

@@ -2,6 +2,7 @@
 using System.Threading;
 using NUnit.Framework;
 using Rubberduck.Inspections.Concrete;
+using Rubberduck.VBEditor.SafeComWrappers;
 using RubberduckTests.Mocks;
 
 namespace RubberduckTests.Inspections
@@ -695,6 +696,32 @@ End Sub
             }
         }
 
+        //Issue #4558.
+        [Test]
+        [Category("Inspections")]
+        public void FolderBelowOptionExplicitAndAboveImplements_NoResult()
+        {
+            const string inputCode = @"Option Explicit
+'@Folder(""Excel.Abstract"")
+Implements IWorkbookData
+
+";
+            const string interfaceCode = @"Option Explicit
+'@Folder(""Excel.Abstract"")
+Implements IWorkbookData
+
+";
+            var vbe = MockVbeBuilder.BuildFromModules(new[]{("testClass", inputCode, ComponentType.ClassModule), ("IWorkbookData", interfaceCode, ComponentType.ClassModule) });
+            using (var state = MockParser.CreateAndParse(vbe.Object))
+            {
+                var inspection = new IllegalAnnotationInspection(state);
+                var inspector = InspectionsHelper.GetInspector(inspection);
+                var inspectionResults = inspector.FindIssuesAsync(state, CancellationToken.None).Result;
+
+                Assert.IsFalse(inspectionResults.Any());
+            }
+        }
+
         [Test]
         [Category("Inspections")]
         public void InspectionName()

RubberduckTests/Mocks/MockVbeBuilder.cs

@@ -171,13 +171,21 @@ public static Mock<IVBE> BuildFromSingleModule(string content, string name, Comp
         /// Builds a mock VBE containing multiple standard modules.
         /// </summary>
         public static Mock<IVBE> BuildFromStdModules(params (string name, string content)[] modules)
+        {
+            return BuildFromModules(modules.Select(tpl => (tpl.name, tpl.content, ComponentType.StandardModule)).ToArray());
+        }
+
+        /// <summary>
+        /// Builds a mock VBE containing one project with multiple modules.
+        /// </summary>
+        public static Mock<IVBE> BuildFromModules(params (string name, string content, ComponentType componentType)[] modules)
         {
             var vbeBuilder = new MockVbeBuilder();
 
             var builder = vbeBuilder.ProjectBuilder(TestProjectName, ProjectProtection.Unprotected);
             foreach (var module in modules)
             {
-                builder.AddComponent(module.name, ComponentType.StandardModule, module.content);
+                builder.AddComponent(module.name, module.componentType, module.content);
             }
 
             var project = builder.Build();