diff --git a/test/sanity/nwjc/index.html b/test/sanity/nwjc/index.html
index 481dfc95b1..0ebb41b301 100644
--- a/test/sanity/nwjc/index.html
+++ b/test/sanity/nwjc/index.html
@@ -8,5 +8,7 @@
   <script>
     mytest(2);
     document.write('<p id="result2">' + mytest.toString() + '</p>');
+    testinner(2);
+    document.write('<p id="result4">' + testinner.toString() + '</p>');
   </script>
 </body></html>
diff --git a/test/sanity/nwjc/mytest.js b/test/sanity/nwjc/mytest.js
index 7990ecd1ec..27b1447126 100644
--- a/test/sanity/nwjc/mytest.js
+++ b/test/sanity/nwjc/mytest.js
@@ -1,3 +1,10 @@
 function mytest(a) {
   document.write("<p id='result'>" + (a + 42) + "</p>");
 }
+
+function testinner(a) {
+  function foo(a) {
+    document.write("<p id='result3'>" + (a + 42) + "</p>");
+  }
+  foo(a);
+}
diff --git a/test/sanity/nwjc/test.py b/test/sanity/nwjc/test.py
index 8ffa9841eb..6b3313e94c 100644
--- a/test/sanity/nwjc/test.py
+++ b/test/sanity/nwjc/test.py
@@ -26,6 +26,7 @@
     out, err = proc.communicate()
     print out
     assert("42" not in out)
+    assert("foo" not in out)
 
 driver = webdriver.Chrome(executable_path=os.environ['CHROMEDRIVER'], chrome_options=chrome_options)
 try:
@@ -36,6 +37,10 @@
     assert("44" == result.get_attribute('innerHTML'))
     result2 = driver.find_element_by_id('result2').get_attribute('innerHTML')
     print result2
-    assert("native code" in result2)
+    assert("function mytest() { [native code] }" == result2)
+    result3 = driver.find_element_by_id('result3').get_attribute('innerHTML')
+    result4 = driver.find_element_by_id('result4').get_attribute('innerHTML')
+    assert("44" == result3)
+    assert("function testinner() { [native code] }" == result4)
 finally:
     driver.quit()