fix conftest detection if commandline arguments contain "::" syntax

--HG--
branch : fix_initial_parsing

CHANGELOG

@@ -9,6 +9,9 @@ NEXT
 - fix integration of pytest with unittest.mock.patch decorator when
   it uses the "new" argument.  Thanks Nicolas Delaby for test and PR.
 
+- fix issue with detecting conftest files if the arguments contain
+  "::" node id specifications (copy pasted from "-v" output)
+
 
 2.6
 -----------------------------------

_pytest/config.py

@@ -485,6 +485,11 @@ class Conftest(object):
         testpaths = namespace.file_or_dir
         foundanchor = False
         for path in testpaths:
+            path = str(path)
+            # remove node-id syntax
+            i = path.find("::")
+            if i != -1:
+                path = path[:i]
             anchor = current.join(path, abs=1)
             if exists(anchor): # we found some file object
                 self._try_load_conftest(anchor)

testing/test_conftest.py

@@ -237,3 +237,21 @@ def test_fixture_dependency(testdir, monkeypatch):
     """))
     result = testdir.runpytest("sub")
     result.stdout.fnmatch_lines(["*1 passed*"])
+
+
+def test_conftest_found_with_double_dash(testdir):
+    sub = testdir.mkdir("sub")
+    sub.join("conftest.py").write(py.std.textwrap.dedent("""
+        def pytest_addoption(parser):
+            parser.addoption("--hello-world", action="store_true")
+    """))
+    p = sub.join("test_hello.py")
+    p.write(py.std.textwrap.dedent("""
+        import pytest
+        def test_hello(found):
+            assert found == 1
+    """))
+    result = testdir.runpytest(str(p) + "@2::test_hello", "-h")
+    result.stdout.fnmatch_lines("""
+        *--hello-world*
+    """)