New test.

svn path=/trunk/mcs/; revision=85666

mcs/tests/gtest-linq-09.cs

@@ -0,0 +1,80 @@
+// Compiler options: -langversion:linq
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+class Data
+{
+	public int Key;
+	public string Value;
+}
+
+class Join
+{
+	public static int Main ()
+	{
+		Data[] d1 = new Data[] { new Data () { Key = 1, Value = "First" } };
+		Data[] d2 = new Data[] { 
+			new Data () { Key = 1, Value = "Second" },
+			new Data () { Key = 1, Value = "Third" }
+		};
+
+		
+		var e = from a in d1
+			join b in d2 on a.Key equals b.Key
+			select new { Result = a.Value + b.Value };
+
+		var res = e.ToList ();
+		if (res.Count != 2)
+			return 1;
+		
+		if (res [0].Result != "FirstSecond")
+			return 2;
+			
+		if (res [1].Result != "FirstThird")
+			return 3;
+			
+		e = from Data a in d1
+			join b in d2 on a.Key equals b.Key
+			where b.Value == "Second"
+			select new { Result = a.Value + b.Value };
+			
+		res = e.ToList ();
+		if (res.Count != 1)
+			return 4;
+		
+		if (res [0].Result != "FirstSecond")
+			return 5;		
+			
+		// Explicitly typed
+		e = from Data a in d1
+            join Data b in d2 on a.Key equals b.Key
+            select new { Result = a.Value + b.Value };
+		
+		res = e.ToList ();
+		if (res.Count != 2)
+			return 10;
+		
+		if (res [0].Result != "FirstSecond")
+			return 11;
+			
+		if (res [1].Result != "FirstThird")
+			return 12;
+		
+		var e2 = from Data a in d1
+			join b in d2 on a.Key equals b.Key
+			group b by a.Key;
+
+		var res2 = e2.ToList ();
+		if (res2.Count != 1)
+			return 20;
+		
+		if (res2 [0].Key != 1)
+			return 21;
+			
+		Console.WriteLine ("OK");
+		return 0;
+	}
+}
+