fix tests

Author: rbri

build.gradle

@@ -11,7 +11,7 @@ apply plugin: 'signing'
 
 group = "net.sourceforge.htmlunit"
 archivesBaseName = "htmlunit-core-js"
-version = "2.36.0"
+version = "2.37.0-SNAPSHOT"
 
 
 jar {

src/test/java/net/sourceforge/htmlunit/ExceptionPropertiesTest.java

@@ -61,16 +61,17 @@ public void lineNumber() {
 
     @Test
     public void stack() {
-        testIt("try { null.method() } catch (e) { e.stack }", "@myScript.js:1" + LS);
-        final String expectedStack = "f()@myScript.js:2" + LS
-            + "@myScript.js:4" + LS;
+        testIt("try { null.method() } catch (e) { e.stack }", "\tat myScript.js:1" + LS);
+        final String expectedStack = "\tat myScript.js:2 (f)" + LS + "\tat myScript.js:4" + LS;
         testIt("function f() {\n null.method(); \n}\n try { f() } catch (e) { e.stack }", expectedStack);
     }
 
     private static void testIt(final String script, final Object expected) {
         final ContextAction action = new ContextAction() {
             @Override
             public Object run(final Context cx) {
+                cx.setLanguageVersion(Context.VERSION_ES6);
+
                 try {
                     final ScriptableObject scope = cx.initStandardObjects();
                     final Object o = cx.evaluateString(scope, script,

src/test/java/net/sourceforge/htmlunit/NativeErrorTest.java

@@ -26,7 +26,7 @@ public void stack() throws Exception {
                 + "    null.method();\n"
                 + "  } catch (e) {\n"
                 + "    if (e.stack)\n"
-                + "      output += e.stack.indexOf('test()@') != -1;\n"
+                + "      output += e.stack.indexOf('\tat test.js:3 (test)') != -1;\n"
                 + "    else\n"
                 + "      output += 'undefined';\n"
                 + "  }\n"

src/test/java/net/sourceforge/htmlunit/NativeGlobalTest.java

@@ -33,6 +33,7 @@ private static void doTest(final double expected, final String src) throws Excep
         final ContextAction action = new ContextAction() {
             @Override
             public Object run(final Context cx) {
+                cx.setLanguageVersion(Context.VERSION_ES6);
                 final Scriptable scope = cx.initStandardObjects();
                 Object result = cx.evaluateString(scope, src, "test.js", 0, null);
                 assertEquals(expected, result);

src/test/java/net/sourceforge/htmlunit/NativeObjectTest.java

@@ -6,7 +6,6 @@
 
 import net.sourceforge.htmlunit.corejs.javascript.Context;
 import net.sourceforge.htmlunit.corejs.javascript.ContextAction;
-import net.sourceforge.htmlunit.corejs.javascript.EcmaError;
 import net.sourceforge.htmlunit.corejs.javascript.Scriptable;
 
 /**