Add simple test for correct upvalue handling.

src/test/java/lua/LuaJTest.java

@@ -43,6 +43,10 @@ public class LuaJTest extends TestCase {
 		runTest( "test7" );
 	}
 	
+	public void testUpvalues() throws IOException, InterruptedException {
+		runTest( "upvalues" );
+	}
+	
 	private void runTest( String testName ) throws IOException, InterruptedException {
 		// add LuaJava bindings
 		LuaJava.install();

src/test/res/upvalues.lua

@@ -0,0 +1,25 @@
+function test()
+	local x = 5
+	function f()
+		x = x + 1
+		return x
+	end
+	function g()
+		x = x - 1
+		return x
+	end
+	print(f())
+	print(g())
+	return f, g
+end
+
+f1, g1 = test()
+print("f1()=", f1())
+print("g1()=", g1())
+
+f2, g2 = test()
+print("f2()=", f2())
+print("g2()=", g2())
+
+print("g1()=", g1())
+print("f1()=", f1())