Adding a few known assembly types to the ignore list in the TypeFinder.

Changing Migration test to use the Type and Attribute resolver.

src/Umbraco.Core/TypeFinder.cs

@@ -240,7 +240,13 @@ namespace Umbraco.Core
 					"umbraco.webservices",
                     "Lucene.",
                     "Examine,",
-                    "Examine."
+                    "Examine.",
+                    "ServiceStack.",
+                    "MySql.",
+                    "HtmlAgilityPack.",
+                    "TidyNet.",
+                    "ICSharpCode.",
+                    "CookComputing."
                 };
 
 		public static IEnumerable<Type> FindClassesOfTypeWithAttribute<T, TAttribute>()

src/Umbraco.Tests/Migrations/PluginManagerExtensions.cs

@@ -12,12 +12,13 @@ namespace Umbraco.Tests.Migrations
     {
         public static IEnumerable<Type> ResolveMigrationTypes(this PluginManager resolver)
         {
-            return resolver.ResolveTypes<IMigration>();
+            return resolver.ResolveTypesWithAttribute<IMigration, MigrationAttribute>();
         }
 
         public static IEnumerable<IMigration> FindMigrations(this PluginManager resolver)
         {
-            return resolver.FindAndCreateInstances<IMigration>();
+            var types = resolver.ResolveTypesWithAttribute<IMigration, MigrationAttribute>();
+            return resolver.CreateInstances<IMigration>(types);
         }
     }
 }

src/Umbraco.Tests/Migrations/Stubs/Dummy.cs

@@ -0,0 +1,21 @@
+using Umbraco.Core.Persistence.Migrations;
+
+namespace Umbraco.Tests.Migrations.Stubs
+{
+    /// <summary>
+    /// This is just a dummy class that is used to ensure that implementations
+    /// of IMigration is not found if it doesn't have the MigrationAttribute (like this class).
+    /// </summary>
+    public class Dummy : IMigration
+    {
+        public void Up()
+        {
+            throw new System.NotImplementedException();
+        }
+
+        public void Down()
+        {
+            throw new System.NotImplementedException();
+        }
+    }
+}

src/Umbraco.Tests/Umbraco.Tests.csproj

@@ -137,6 +137,7 @@
     <Compile Include="Migrations\FindingMigrationsTest.cs" />
     <Compile Include="Migrations\Stubs\AlterUserTableMigrationStub.cs" />
     <Compile Include="Migrations\PluginManagerExtensions.cs" />
+    <Compile Include="Migrations\Stubs\Dummy.cs" />
     <Compile Include="Migrations\Stubs\FourNineMigration.cs" />
     <Compile Include="Persistence\Querying\ContentRepositorySqlClausesTest.cs" />
     <Compile Include="Persistence\Querying\ContentTypeRepositorySqlClausesTest.cs" />