diff --git a/tests/test_app.py b/tests/test_app.py
index 9636b75..6ab109a 100644
--- a/tests/test_app.py
+++ b/tests/test_app.py
@@ -698,3 +698,9 @@ def test_xhr_param_change_headers(self):
             resp.charset = 'ascii'
             self.assertIn('HTTP_X_REQUESTED_WITH: XMLHttpRequest',
                           resp.text)
+
+
+class TestRequest(unittest.TestCase):
+
+    def test_pytest_collection_disabled(self):
+        self.assertFalse(webtest.TestRequest.__test__)
diff --git a/tests/test_response.py b/tests/test_response.py
index aa1cb1d..5504173 100644
--- a/tests/test_response.py
+++ b/tests/test_response.py
@@ -492,3 +492,6 @@ def test_maybe_follow_twice(self):
     def test_maybe_follow_infinite(self):
         app = self.get_redirects_app(100000)
         self.assertRaises(AssertionError, app.get('/').maybe_follow)
+
+    def test_pytest_collection_disabled(self):
+        self.assertFalse(webtest.TestResponse.__test__)
diff --git a/webtest/app.py b/webtest/app.py
index 9e3155e..9304288 100644
--- a/webtest/app.py
+++ b/webtest/app.py
@@ -76,6 +76,10 @@ def set_ok_domain(self, cookie, request):
 
 class TestRequest(webob.BaseRequest):
     """A subclass of webob.Request"""
+
+    # Tell pytest not to collect this class as tests
+    __test__ = False
+
     ResponseClass = TestResponse
 
 
diff --git a/webtest/response.py b/webtest/response.py
index fea35aa..c69cad7 100644
--- a/webtest/response.py
+++ b/webtest/response.py
@@ -22,6 +22,9 @@ class TestResponse(webob.Response):
     _forms_indexed = None
     parser_features = 'html.parser'
 
+    # Tell pytest not to collect this class as tests
+    __test__ = False
+
     @property
     def forms(self):
         """