More tests.

Add a generate event test for generating in normal files over auto
generated files.

src/EditorFeatures/Test2/Diagnostics/GenerateEvent/GenerateEventCrossLanguageTests.vb

@@ -115,5 +115,44 @@ public delegate void EvHandler(int x);
 
             Test(input, expected)
         End Sub
+
+        <WorkItem(144843, "Generate method stub generates into *.Designer.cs")>
+        <Fact, Trait(Traits.Feature, Traits.Features.CodeActionsGenerateEvent)>
+        Public Sub PreferNormalFileOverAutoGeneratedFile_Basic()
+            Dim input =
+        <Workspace>
+            <Project Language="Visual Basic" AssemblyName="VBAssembly1" CommonReferences="true">
+                <Document>
+Class c
+    WithEvents field as UserControl1
+    Sub Foo(x as Integer) Handles field.Ev$$
+    End Sub
+End Class
+                </Document>
+                <Document FilePath="UserControl1.Designer.vb">
+' This file is auto-generated
+Partial Class UserControl1
+    
+End Class
+                </Document>
+                <Document FilePath="UserControl1.vb">
+Partial Public Class UserControl1
+    
+End Class
+                </Document>
+            </Project>
+        </Workspace>
+
+            Dim expectedFileWithText =
+                 New Dictionary(Of String, String) From {
+                    {"UserControl1.vb",
+<Text>
+Partial Public Class UserControl1
+    Public Event Ev(x As Integer)
+End Class
+</Text>.Value.Trim()}}
+
+            Test(input, fileNameToExpected:=expectedFileWithText)
+        End Sub
     End Class
 End Namespace