fix test

Author: rbri

src/test/java/org/htmlunit/corejs/NativeErrorTest.java

@@ -22,7 +22,7 @@ public void stack() throws Exception {
                 + "    null.method();\n"
                 + "  } catch (e) {\n"
                 + "    if (e.stack)\n"
-                + "      output += e.stack.indexOf('\tat test.js:3 (test)') != -1;\n"
+                + "      output += e.stack.indexOf('\tat test.js:2 (test)') != -1;\n"
                 + "    else\n"
                 + "      output += 'undefined';\n"
                 + "  }\n"
@@ -31,7 +31,7 @@ public void stack() throws Exception {
                 + "test();\n"
                 + "output";
 
-        Utils.assertWithAllModes_ES6(Boolean.TRUE, script);
+        Utils.assertWithAllModes_ES6("true", script);
     }
 
     /**