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diff --git a/mcs/class/Microsoft.Build/Test/Microsoft.Build.Evaluation/ProjectCollectionTest.cs b/mcs/class/Microsoft.Build/Test/Microsoft.Build.Evaluation/ProjectCollectionTest.cs
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+++ b/mcs/class/Microsoft.Build/Test/Microsoft.Build.Evaluation/ProjectCollectionTest.cs
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+//
+// ProjectCollectionTest.cs
+//
+// Author:
+//   Atsushi Enomoto (atsushi@xamarin.com)
+//
+// Copyright (C) 2013 Xamarin Inc. (http://www.xamarin.com)
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+// 
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+using System;
+using System.IO;
+using System.Linq;
+using System.Xml;
+using Microsoft.Build.Construction;
+using Microsoft.Build.Evaluation;
+using NUnit.Framework;
+using Microsoft.Build.Execution;
+
+namespace MonoTests.Microsoft.Build.Evaluation
+{
+	[TestFixture]
+	public class ProjectCollectionTest
+	{
+		[Test]
+		public void GlobalProperties ()
+		{
+			var g = ProjectCollection.GlobalProjectCollection;
+			Assert.AreEqual (0, g.GlobalProperties.Count, "#1");
+			Assert.IsTrue (g.GlobalProperties.IsReadOnly, "#2");
+		}
+		
+		[Test]
+		public void DefaultToolsVersion ()
+		{
+			var pc = ProjectCollection.GlobalProjectCollection;
+			Assert.AreEqual (pc.Toolsets.First ().ToolsVersion, pc.DefaultToolsVersion, "#1");
+		}
+		
+		[Test]
+		public void Toolsets ()
+		{
+			var pc = ProjectCollection.GlobalProjectCollection;
+			Assert.IsNotNull (pc.Toolsets, "#1-1");
+			Assert.IsTrue (pc.Toolsets.Any (), "#1-2");
+			pc = new ProjectCollection ();
+			Assert.IsNotNull (pc.Toolsets, "#2-1");
+			Assert.IsTrue (pc.Toolsets.Any (), "#2-2");
+		}
+		
+		[Test]
+		public void BuildDoesNotIncreaseCollectionContent ()
+		{
+			string empty_project_xml = "<Project xmlns='http://schemas.microsoft.com/developer/msbuild/2003' />";
+			var xml = XmlReader.Create (new StringReader (empty_project_xml));
+			var root = ProjectRootElement.Create (xml);
+			var coll = new ProjectCollection ();
+			var inst = new ProjectInstance (root, null, null, coll);
+			root.FullPath = "ProjectCollectionTest.BuildDoesNotIncreaseCollectionContent.proj";
+			Assert.AreEqual (0, coll.Count, "#1");
+			inst.Build ();
+			Assert.AreEqual (0, coll.Count, "#2");
+		}
+		
+		[Test]
+		public void GetLoadedProjectsWithoutFullPath ()
+		{
+			string project_xml = @"<Project xmlns='http://schemas.microsoft.com/developer/msbuild/2003' />";
+			var xml = XmlReader.Create (new StringReader (project_xml));
+			var root = ProjectRootElement.Create (xml);
+			string path = Path.GetFullPath ("foo.xml");
+			var pc = new ProjectCollection ();
+			
+			pc.LoadProject (XmlReader.Create (new StringReader (project_xml), null, path));
+			Assert.AreEqual (0, pc.GetLoadedProjects (path).Count, "#1"); // huh?
+			Assert.AreEqual (0, pc.LoadedProjects.Count, "#1.1");
+			
+			new Project (root, null, null, pc);
+			Assert.AreEqual (0, pc.GetLoadedProjects (path).Count, "#2"); // huh?
+		}
+			
+		[Test]
+		public void GetLoadedProjectsSuccess ()
+		{
+			string project_xml = @"<Project xmlns='http://schemas.microsoft.com/developer/msbuild/2003' />";
+			var xml = XmlReader.Create (new StringReader (project_xml));
+			var root = ProjectRootElement.Create (xml);
+			string path = Path.GetFullPath ("foo.xml");
+			var pc = new ProjectCollection ();
+			
+			var proj = new Project (root, null, null, pc);
+			// this order also matters for test; It sets FullPath after Project.ctor(), and should still work.
+			root.FullPath = "foo.xml";
+			
+			Assert.AreEqual (1, pc.GetLoadedProjects (path).Count, "#1"); // wow ok...
+			Assert.AreEqual (proj, pc.GetLoadedProjects (path).First (), "#2");
+		}
+			
+		[Test]
+		public void GetLoadedProjectsSuccess2 ()
+		{
+			string project_xml = @"<Project xmlns='http://schemas.microsoft.com/developer/msbuild/2003' />";
+			string path = Path.GetFullPath ("GetLoadedProjectsSuccess2.xml");
+			var pc = new ProjectCollection ();
+			
+			using (var fs = File.CreateText (path))
+				fs.Write (project_xml);
+			try {
+				var proj = pc.LoadProject (path);
+				
+				Assert.AreEqual (1, pc.GetLoadedProjects (path).Count, "#1"); // ok... LoadProject (with filename) adds it to the collection.
+				Assert.AreEqual (proj, pc.GetLoadedProjects (path).First (), "#2");
+			} finally {
+				File.Delete (path);
+			}
+		}
+			
+		[Test]
+		public void GetLoadedProjectsForProjectInstance ()
+		{
+			string project_xml = @"<Project xmlns='http://schemas.microsoft.com/developer/msbuild/2003' />";
+			var xml = XmlReader.Create (new StringReader (project_xml));
+			var root = ProjectRootElement.Create (xml);
+			string path = Path.GetFullPath ("foo.xml");
+			var pc = new ProjectCollection ();
+			root.FullPath = "foo.xml";
+			
+			new ProjectInstance (root, null, null, pc);			
+			Assert.AreEqual (0, pc.GetLoadedProjects (path).Count, "#1"); // so, ProjectInstance does not actually load Project...
+		}
+	}
+}
+