diff --git a/moulinette/core.py b/moulinette/core.py
index 6fe434b9..d2312afd 100644
--- a/moulinette/core.py
+++ b/moulinette/core.py
@@ -180,7 +180,6 @@ class Moulinette18n(object):
 
         moulinette_env = init_moulinette_env()
         self.locales_dir = moulinette_env['LOCALES_DIR']
-        self.lib_dir = moulinette_env['LIB_DIR']
 
         # Init global translator
         self._global = Translator(self.locales_dir, default_locale)
@@ -201,7 +200,8 @@ class Moulinette18n(object):
         """
         if namespace not in self._namespaces:
             # Create new Translator object
-            translator = Translator('%s/%s/locales' % (self.lib_dir, namespace),
+            lib_dir = init_moulinette_env()["LIB_DIR"]
+            translator = Translator('%s/%s/locales' % (lib_dir, namespace),
                                     self.default_locale)
             translator.set_locale(self.locale)
             self._namespaces[namespace] = translator
@@ -371,8 +371,8 @@ def init_interface(name, kwargs={}, actionsmap={}):
 
     try:
         mod = import_module('moulinette.interfaces.%s' % name)
-    except ImportError:
-        logger.exception("unable to load interface '%s'", name)
+    except ImportError as e:
+        logger.exception("unable to load interface '%s' : %s", name, e)
         raise MoulinetteError('error_see_log')
     else:
         try:
diff --git a/test/conftest.py b/test/conftest.py
index b5669aac..d7f7700c 100644
--- a/test/conftest.py
+++ b/test/conftest.py
@@ -1,8 +1,10 @@
 """Pytest fixtures for testing."""
 
+from multiprocessing import Process
+import time
 import json
 import os
-
+import shutil
 import pytest
 
 
@@ -42,7 +44,7 @@ def patch_logging(moulinette):
     root_handlers = set(handlers)
 
     level = 'INFO'
-    tty_level = 'SUCCESS'
+    tty_level = 'INFO'
 
     logging = {
         'version': 1,
@@ -61,6 +63,10 @@ def patch_logging(moulinette):
             },
         },
         'handlers': {
+            'api': {
+                'level': level,
+                'class': 'moulinette.interfaces.api.APIQueueHandler',
+            },
             'tty': {
                 'level': tty_level,
                 'class': 'moulinette.interfaces.cli.TTYHandler',
@@ -102,6 +108,26 @@ def moulinette():
     return moulinette
 
 
+@pytest.fixture(scope='session')
+def moulinette_webapi(moulinette, tmp_path_factory):
+    namespace = "test"
+    tmp_data = str(tmp_path_factory.mktemp("data"))
+    tmp_locales = str(tmp_path_factory.mktemp("data"))
+    os.environ['MOULINETTE_DATA_DIR'] = tmp_data
+    os.environ['MOULINETTE_LIB_DIR'] = tmp_locales
+    shutil.copytree("./data/actionsmap", "%s/actionsmap" % tmp_data)
+    shutil.copytree("./locales", "%s/%s/locales" % (tmp_locales, namespace))
+
+    api_thread = Process(target=moulinette.api,
+                         args=([namespace],),
+                         kwargs={"host": "localhost", "port": 12342, "use_websocket": False})
+    api_thread.start()
+    time.sleep(0.5)
+    assert api_thread.is_alive()
+    yield "http://localhost:12342"
+    api_thread.terminate()
+
+
 @pytest.fixture
 def test_file(tmp_path):
     test_text = 'foo\nbar\n'
diff --git a/tox.ini b/tox.ini
index 895a8f06..6b645c2b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -15,6 +15,9 @@ deps =
   pytest-env >= 0.6.2, < 1.0
   requests >= 2.22.0, < 3.0
   requests-mock >= 1.6.0, < 2.0
+  toml >= 0.10
+  gevent-websocket
+  bottle >= 0.12
 commands =
     pytest {posargs}