Fix pytest with mixed up filename casing.

src/_pytest/config/__init__.py

@@ -36,6 +36,10 @@ hookimpl = HookimplMarker("pytest")
 hookspec = HookspecMarker("pytest")
 
 
+def _uniquepath(path):
+    return type(path)(os.path.normcase(str(path.realpath())))
+
+
 class ConftestImportFailure(Exception):
     def __init__(self, path, excinfo):
         Exception.__init__(self, path, excinfo)
@@ -366,7 +370,7 @@ class PytestPluginManager(PluginManager):
         """
         current = py.path.local()
         self._confcutdir = (
-            current.join(namespace.confcutdir, abs=True)
+            _uniquepath(current.join(namespace.confcutdir, abs=True))
             if namespace.confcutdir
             else None
         )
@@ -405,19 +409,18 @@ class PytestPluginManager(PluginManager):
         else:
             directory = path
 
+        directory = _uniquepath(directory)
+
         # XXX these days we may rather want to use config.rootdir
         # and allow users to opt into looking into the rootdir parent
         # directories instead of requiring to specify confcutdir
         clist = []
-        for parent in directory.realpath().parts():
+        for parent in directory.parts():
             if self._confcutdir and self._confcutdir.relto(parent):
                 continue
             conftestpath = parent.join("conftest.py")
             if conftestpath.isfile():
-                # Use realpath to avoid loading the same conftest twice
+                mod = self._importconftest(conftestpath)
-                # with build systems that create build directories containing
-                # symlinks to actual files.
-                mod = self._importconftest(conftestpath.realpath())
                 clist.append(mod)
         self._dirpath2confmods[directory] = clist
         return clist
@@ -432,6 +435,10 @@ class PytestPluginManager(PluginManager):
         raise KeyError(name)
 
     def _importconftest(self, conftestpath):
+        # Use realpath to avoid loading the same conftest twice
+        # with build systems that create build directories containing
+        # symlinks to actual files.
+        conftestpath = _uniquepath(conftestpath)
         try:
             return self._conftestpath2mod[conftestpath]
         except KeyError:

testing/test_conftest.py

@@ -3,8 +3,9 @@ import textwrap
 import py
 
 import pytest
-from _pytest.config import PytestPluginManager
+from _pytest.config import PytestPluginManager, _uniquepath
 from _pytest.main import ExitCode
+import os.path
 
 
 def ConftestWithSetinitial(path):
@@ -141,11 +142,11 @@ def test_conftestcutdir(testdir):
     # but we can still import a conftest directly
     conftest._importconftest(conf)
     values = conftest._getconftestmodules(conf.dirpath())
-    assert values[0].__file__.startswith(str(conf))
+    assert values[0].__file__.startswith(str(_uniquepath(conf)))
     # and all sub paths get updated properly
     values = conftest._getconftestmodules(p)
     assert len(values) == 1
-    assert values[0].__file__.startswith(str(conf))
+    assert values[0].__file__.startswith(str(_uniquepath(conf)))
 
 
 def test_conftestcutdir_inplace_considered(testdir):
@@ -154,7 +155,7 @@ def test_conftestcutdir_inplace_considered(testdir):
     conftest_setinitial(conftest, [conf.dirpath()], confcutdir=conf.dirpath())
     values = conftest._getconftestmodules(conf.dirpath())
     assert len(values) == 1
-    assert values[0].__file__.startswith(str(conf))
+    assert values[0].__file__.startswith(str(_uniquepath(conf)))
 
 
 @pytest.mark.parametrize("name", "test tests whatever .dotdir".split())
@@ -164,7 +165,7 @@ def test_setinitial_conftest_subdirs(testdir, name):
     conftest = PytestPluginManager()
     conftest_setinitial(conftest, [sub.dirpath()], confcutdir=testdir.tmpdir)
     if name not in ("whatever", ".dotdir"):
-        assert subconftest in conftest._conftestpath2mod
+        assert _uniquepath(subconftest) in conftest._conftestpath2mod
         assert len(conftest._conftestpath2mod) == 1
     else:
         assert subconftest not in conftest._conftestpath2mod
@@ -274,6 +275,24 @@ def test_conftest_symlink_files(testdir):
     result.stdout.fnmatch_lines(["*conftest_loaded*", "PASSED"])
     assert result.ret == ExitCode.OK
 
+@pytest.mark.skipif(
+    os.path.normcase('x') != os.path.normcase('X'),
+    reason="only relevant for case insensitive file systems",
+)
+def test_conftest_badcase(testdir):
+    """Check conftest.py loading when directory casing is wrong."""
+    testdir.tmpdir.mkdir("JenkinsRoot").mkdir("test")
+    source = {
+        "setup.py": "",
+        "test/__init__.py": "",
+        "test/conftest.py": ""
+    }
+    testdir.makepyfile(**{"JenkinsRoot/%s" % k: v for k, v in source.items()})
+
+    testdir.tmpdir.join("jenkinsroot/test").chdir()
+    result = testdir.runpytest()
+    assert result.ret == ExitCode.NO_TESTS_COLLECTED
+
 
 def test_no_conftest(testdir):
     testdir.makeconftest("assert 0")