--- a/tests/test.py	Fri Mar 30 08:48:25 2018 +0200
+++ b/tests/test.py	Wed Apr 04 09:45:29 2018 +0200
@@ -14,6 +14,7 @@
 import configmix
 import configmix.ini
 import configmix.yaml
+import configmix.json
 import configmix.py
 from configmix.compat import u
 
@@ -67,29 +68,33 @@
             cfg = configmix.yaml.safe_load(f)
             self.__check_types(cfg)
 
-    def test04_py_export_all(self):
+    def test04_json_types(self):
+        cfg = configmix.json.load(os.path.join(TESTDATADIR, "conf1.json"))
+        self.__check_types(cfg)
+
+    def test05_py_export_all(self):
         # When __all__ is given only it's keys are exported
         cfg = configmix.py.load(os.path.join(TESTDATADIR, "conf2.py"))
         self.assertEqual(u("the next value"), cfg.get("key1"))
         self.assertTrue(isinstance(cfg.get("key1"), type(u(''))))
         self.assertTrue(cfg.get("key2") is None)
 
-    def test05_py_hide_private(self):
+    def test06_py_hide_private(self):
         # When no __all__ is given all symbols with leading "_" are hidden
         cfg = configmix.py.load(os.path.join(TESTDATADIR, "conf3.py"))
         self.assertEqual(u("the next value "), cfg.get("key1"))
         self.assertTrue(isinstance(cfg.get("key1"), type(u(''))))
         self.assertTrue(cfg.get("_key2") is None)
 
-    def test06_ini_tree(self):
+    def test07_ini_tree(self):
         cfg = configmix.ini.load(os.path.join(TESTDATADIR, "conf10.ini"))
         self.__check_tree(cfg)
 
-    def test07_py_tree(self):
+    def test08_py_tree(self):
         cfg = configmix.py.load(os.path.join(TESTDATADIR, "conf10.py"))
         self.__check_tree(cfg)
 
-    def test08_yaml_tree(self):
+    def test09_yaml_tree(self):
         with io.open(os.path.join(TESTDATADIR, "conf10.yml"), "rt",
                      encoding="utf-8") as f:
             cfg = configmix.yaml.safe_load(f)