Revert "enhance tests (mostly codegen)" temporarily

This reverts commit 95f9bcbacb.

compiler/tests/org/jetbrains/jet/codegen/NamespaceGenTest.java

@@ -19,7 +19,6 @@ package org.jetbrains.jet.codegen;
 import jet.IntRange;
 import jet.Tuple2;
 import jet.Tuple4;
-import org.jetbrains.jet.lang.resolve.java.CompilerSpecialMode;
 
 import java.awt.*;
 import java.lang.reflect.InvocationTargetException;
@@ -31,13 +30,6 @@ import java.util.Arrays;
  * @author yole
  */
 public class NamespaceGenTest extends CodegenTestCase {
-
-    @Override
-    protected void setUp() throws Exception {
-        super.setUp();
-        createEnvironmentWithMockJdk(CompilerSpecialMode.JDK_HEADERS);
-    }
-
     public void testPSVM() throws Exception {
         loadFile("PSVM.jet");
 //        System.out.println(generateToText());