diff -r bb7506513353 -r 3d1612be40bc rt/vm/src/test/java/org/apidesign/vm4brwsr/UnderTest.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rt/vm/src/test/java/org/apidesign/vm4brwsr/UnderTest.java	Thu Nov 07 09:41:45 2013 +0100
@@ -0,0 +1,88 @@
+/**
+ * Back 2 Browser Bytecode Translator
+ * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. Look for COPYING file in the top folder.
+ * If not, see http://opensource.org/licenses/GPL-2.0.
+ */
+package org.apidesign.vm4brwsr;
+
+import org.testng.annotations.AfterClass;
+import org.testng.annotations.BeforeClass;
+import org.testng.annotations.Test;
+
+/** Checks behavior of classes and methods with underscore.
+ *
+ * @author Jaroslav Tulach <jtulach@netbeans.org>
+ */
+public class UnderTest {
+    @Test public void one() throws Exception {
+        assertExec(
+            "Should be one", 
+            Under_Score.class, "one__I", 
+            Double.valueOf(1)
+        );
+    }
+
+    @Test public void onePlusOne() throws Exception {
+        assertExec(
+            "Should be two", 
+            Under_Score.class, "one_1plus_1one__I", 
+            Double.valueOf(2)
+        );
+    }
+
+    @Test public void two() throws Exception {
+        assertExec(
+            "Should be two", 
+            Under_Score.class, "two__I", 
+            Double.valueOf(2)
+        );
+    }
+
+    @Test public void staticField() throws Exception {
+        assertExec(
+            "Should be ten", 
+            Under_Score.class, "staticField__I", 
+            Double.valueOf(10)
+        );
+    }
+
+    @Test public void instance() throws Exception {
+        assertExec(
+            "Should be five", 
+            Under_Score.class, "instance__I", 
+            Double.valueOf(5)
+        );
+    }
+
+    
+    private static TestVM code;
+    
+    @BeforeClass 
+    public static void compileTheCode() throws Exception {
+        StringBuilder sb = new StringBuilder();
+        code = TestVM.compileClass(sb, "org/apidesign/vm4brwsr/Under_Score");
+    }
+    @AfterClass
+    public static void releaseTheCode() {
+        code = null;
+    }
+
+    private void assertExec(
+        String msg, Class<?> clazz, String method, 
+        Object ret, Object... args
+    ) throws Exception {
+        code.assertExec(msg, clazz, method, ret, args);
+    }
+}