From 3ab70690d1c9f5647fa08d2322b5165bb3112f3e Mon Sep 17 00:00:00 2001
From: Bruno Oliveira <nicoddemus@gmail.com>
Date: Sat, 4 Aug 2018 15:37:46 -0300
Subject: [PATCH] Add failing example for issue #3778

---
 src/_pytest/pytester.py                               |  4 +++-
 .../fixtures/fill_fixtures/class_variable_auto_use.py | 11 +++++++++++
 testing/python/fixture.py                             |  5 +++++
 3 files changed, 19 insertions(+), 1 deletion(-)
 create mode 100644 testing/example_scripts/fixtures/fill_fixtures/class_variable_auto_use.py

diff --git a/src/_pytest/pytester.py b/src/_pytest/pytester.py
index 5b42b81eedf..5647df41592 100644
--- a/src/_pytest/pytester.py
+++ b/src/_pytest/pytester.py
@@ -667,7 +667,9 @@ def copy_example(self, name=None):
             example_path.copy(result)
             return result
         else:
-            raise LookupError("example is not found as a file or directory")
+            raise LookupError(
+                "example {} is not found as a file or directory".format(example_path)
+            )
 
     Session = Session
 
diff --git a/testing/example_scripts/fixtures/fill_fixtures/class_variable_auto_use.py b/testing/example_scripts/fixtures/fill_fixtures/class_variable_auto_use.py
new file mode 100644
index 00000000000..58d56d782b1
--- /dev/null
+++ b/testing/example_scripts/fixtures/fill_fixtures/class_variable_auto_use.py
@@ -0,0 +1,11 @@
+import pytest
+
+
+class Test(object):
+    @classmethod
+    @pytest.fixture(scope="class", autouse=True)
+    def setup(cls):
+        cls.url = "localhost:5000"
+
+    def test_url(self):
+        assert self.url == "localhost:5000"
diff --git a/testing/python/fixture.py b/testing/python/fixture.py
index bbfcf775be4..1d43b3a2740 100644
--- a/testing/python/fixture.py
+++ b/testing/python/fixture.py
@@ -371,6 +371,11 @@ def test_foo(request):
         result = testdir.runpytest()
         assert result.ret == 0
 
+    def test_class_variable_auto_use(self, testdir):
+        p = testdir.copy_example("class_variable_auto_use.py")
+        result = testdir.runpytest(p)
+        result.stdout.fnmatch_lines("* 1 passed *")
+
     def test_funcarg_lookup_error(self, testdir):
         testdir.makeconftest(
             """