fixup! Add type validation.

CHANGELOG.rst

@@ -1,6 +1,9 @@
 3.0.5.dev0
 ==========
 
+* Add Argparse style type validation for ``--confcutdir`` and ``--junit-xml`` (`#2089`_).
+  Thanks to `@lwm`_ for the PR.
+
 * Add hint to error message hinting possible missing ``__init__.py`` (`#478`_). Thanks `@DuncanBetts`_.
 
 * Provide ``:ref:`` targets for ``recwarn.rst`` so we can use intersphinx referencing.
@@ -33,6 +36,7 @@
 .. _@nedbat: https://github.com/nedbat
 .. _@nmundar: https://github.com/nmundar
 
+.. _#2089: https://github.com/pytest-dev/pytest/issues/2089
 .. _#478: https://github.com/pytest-dev/pytest/issues/478
 .. _#2034: https://github.com/pytest-dev/pytest/issues/2034
 .. _#2038: https://github.com/pytest-dev/pytest/issues/2038

_pytest/config.py

@@ -70,16 +70,25 @@ class UsageError(Exception):
     """ error in pytest usage or invocation"""
 
 
-def filename(path):
-    """Argparse type validator for filename arguments"""
+def filename_arg(path, optname):
+    """ Argparse type validator for filename arguments.
+
+    :path: path of filename
+    :optname: name of the option
+    """
     if os.path.isdir(path):
-        raise UsageError("Must be a filename, given: {0}".format(path))
+        raise UsageError("{0} must be a filename, given: {1}".format(optname, path))
     return path
 
-def directory(path):
-    """Argparse type validator for directory arguments"""
+
+def directory_arg(path, optname):
+    """Argparse type validator for directory arguments.
+
+    :path: path of directory
+    :optname: name of the option
+    """
     if not os.path.isdir(path):
-        raise UsageError("Must be a directory, given: {0}".format(path))
+        raise UsageError("{0} must be a directory, given: {1}".format(optname, path))
     return path
 
 _preinit = []

_pytest/junitxml.py

@@ -8,13 +8,14 @@
 # Output conforms to https://github.com/jenkinsci/xunit-plugin/blob/master/
 # src/main/resources/org/jenkinsci/plugins/xunit/types/model/xsd/junit-10.xsd
 
+import functools
 import py
 import os
 import re
 import sys
 import time
 import pytest
-from _pytest.config import filename
+from _pytest.config import filename_arg
 
 # Python 2.X and 3.X compatibility
 if sys.version_info[0] < 3:
@@ -215,7 +216,7 @@ def pytest_addoption(parser):
         action="store",
         dest="xmlpath",
         metavar="path",
-        type=filename,
+        type=functools.partial(filename_arg, optname="--junitxml"),
         default=None,
         help="create junit-xml style report file at given path.")
     group.addoption(

_pytest/main.py

@@ -1,4 +1,5 @@
 """ core implementation of testing process: init, session, runtest loop. """
+import functools
 import os
 import sys
 
@@ -11,7 +12,7 @@
 except ImportError:
     from UserDict import DictMixin as MappingMixin
 
-from _pytest.config import directory
+from _pytest.config import directory_arg
 from _pytest.runner import collect_one_node
 
 tracebackcutdir = py.path.local(_pytest.__file__).dirpath()
@@ -59,7 +60,7 @@ def pytest_addoption(parser):
     # when changing this to --conf-cut-dir, config.py Conftest.setinitial
     # needs upgrading as well
     group.addoption('--confcutdir', dest="confcutdir", default=None,
-        metavar="dir", type=directory,
+        metavar="dir", type=functools.partial(directory_arg, optname="--confcutdir"),
         help="only load conftest.py's relative to specified dir.")
     group.addoption('--noconftest', action="store_true",
         dest="noconftest", default=False,

testing/test_junitxml.py

@@ -718,7 +718,7 @@ def test_pass():
 def test_logxml_check_isdir(testdir):
     """Give an error if --junit-xml is a directory (#2089)"""
     result = testdir.runpytest("--junit-xml=.")
-    result.stderr.fnmatch_lines(["*Must be a filename*"])
+    result.stderr.fnmatch_lines(["*--junitxml must be a filename*"])
 
 def test_escaped_parametrized_names_xml(testdir):
     testdir.makepyfile("""