--- a/python/mozbuild/mozbuild/test/configure/common.py
+++ b/python/mozbuild/mozbuild/test/configure/common.py
@@ -214,16 +214,25 @@ class ConfigureTestSandbox(ConfigureSand
         script = mozpath.abspath(args[0])
         if script in self._subprocess_paths:
             return self._subprocess_paths[script](stdin, args[1:])
         return 127, '', 'File not found'
 
     def vswhere(self, stdin, args):
         return 0, '[]', ''
 
+    def get_config(self, name):
+        # Like the loop in ConfigureSandbox.run, but only execute the code
+        # associated with the given config item.
+        for func, args in self._execution_queue:
+            if (func == self._resolve_and_set and args[0] is self._config
+                    and args[1] == name):
+                func(*args)
+                return self._config.get(name)
+
 
 class BaseConfigureTest(unittest.TestCase):
     HOST = 'x86_64-pc-linux-gnu'
 
     def setUp(self):
         self._cwd = os.getcwd()
         os.chdir(topobjdir)
 

--- a/python/mozbuild/mozbuild/test/configure/test_toolkit_moz_configure.py
+++ b/python/mozbuild/mozbuild/test/configure/test_toolkit_moz_configure.py
@@ -4,16 +4,17 @@
 
 from __future__ import absolute_import, print_function, unicode_literals
 
 import os
 
 from buildconfig import topsrcdir
 from common import BaseConfigureTest
 from mozunit import main
+from mozbuild.configure.options import InvalidOptionError
 
 
 class TestToolkitMozConfigure(BaseConfigureTest):
     def test_necko_protocols(self):
         def get_value(arg):
             sandbox = self.get_sandbox({}, {}, [arg])
             return sandbox._value_for(sandbox['necko_protocols'])
 
@@ -57,11 +58,28 @@ class TestToolkitMozConfigure(BaseConfig
         self.assertEqual(
             get_value('--enable-necko-protocols=all,-http,-about'),
             tuple(p for p in default_protocols if p not in ('http', 'about')))
 
         self.assertEqual(
             get_value('--enable-necko-protocols=default,-http,-about'),
             tuple(p for p in default_protocols if p not in ('http', 'about')))
 
+    def test_developer_options(self):
+        def get_value(args=[], environ={}):
+            sandbox = self.get_sandbox({}, {}, args, environ)
+            return sandbox.get_config('DEVELOPER_OPTIONS')
+
+        self.assertEqual(get_value(), True)
+
+        self.assertEqual(get_value(['--enable-release']), None)
+
+        self.assertEqual(get_value(environ={'MOZILLA_OFFICIAL': 1}), None)
+
+        self.assertEqual(get_value(['--enable-release'],
+                         environ={'MOZILLA_OFFICIAL': 1}), None)
+
+        with self.assertRaises(InvalidOptionError):
+            get_value(['--disable-release'], environ={'MOZILLA_OFFICIAL': 1})
+
 
 if __name__ == '__main__':
     main()