remove dependence and implmented import_string

tests/test_config.py

@@ -35,6 +35,11 @@ def test_load_from_object_string(app):
     assert 'not_for_config' not in app.config
 
 
+def test_load_from_object_string_exception(app):
+    with pytest.raises(ImportError):
+        app.config.from_object('test_config.Config.test')
+
+
 def test_auto_load_env():
     environ["SANIC_TEST_ANSWER"] = "42"
     app = Sanic()

tests/test_helpers.py

@@ -1,4 +1,5 @@
 from sanic import helpers
+import pytest
 
 
 def test_has_message_body():
@@ -72,3 +73,14 @@ def test_remove_entity_headers():
 
     for header, expected in tests:
         assert helpers.remove_entity_headers(header) == expected
+
+
+def test_import_string():
+    from sanic.config import Config
+    obj = helpers.import_string('sanic.config.Config')
+    assert isinstance(obj, Config)
+
+
+def test_import_string_exception():
+    with pytest.raises(ImportError):
+        helpers.import_string('test.test.test')