Fix bug with DSLMixin

capybara/dsl.py

@@ -37,11 +37,15 @@ def _define_package_method(name):
 
 def _define_session_method(name):
     @wraps(getattr(Session, name))
-    def func(*args, **kwargs):
+    def class_func(self, *args, **kwargs):
         return getattr(page, name)(*args, **kwargs)
 
-    setattr(DSLMixin, name, func)
-    setattr(_module, name, func)
+    @wraps(getattr(Session, name))
+    def module_func(*args, **kwargs):
+        return getattr(page, name)(*args, **kwargs)
+
+    setattr(DSLMixin, name, class_func)
+    setattr(_module, name, module_func)
 
 
 for _method in PACKAGE_METHODS:

tests/test_dsl.py

@@ -139,3 +139,15 @@ def test_is_nestable(self):
 class TestSessionName(DSLTestCase):
     def test_defaults_to_default(self):
         assert capybara.session_name == "default"
+
+
+class TestUsingDSLMixin(DSLTestCase):
+    @pytest.fixture
+    def myclass(self):
+        from capybara.dsl import DSLMixin
+        class MyClass(DSLMixin):
+            pass
+        return MyClass()
+
+    def test_uses_current_session(self, myclass):
+        assert myclass.has_no_current_path("/")