Fixed issue 49

1 files changed, 43 insertions, 0 deletions

diff --git a/selftest.py b/selftest.py
new file mode 100755
index 0000000..f09e0c9
--- /dev/null
+++ b/selftest.py
@@ -0,0 +1,43 @@
+#!/usr/bin/env python
+
+"""Test the copy of nose in this directory, by running that nose against itself.
+
+You can test nose using nose in other ways, but if you don't use this script,
+you might have one installation of nose testing another installation, which is
+not supported.
+"""
+
+# More detail:
+
+# In the absence of some sort of deep renaming magic, nose can't reasonably
+# test a different installation of itself, given the existence of the global
+# module registry sys.modules .
+
+# If installed system-wide with setuptools, setuptools (via the site-packages
+# easy-install.pth) takes you at your word and ensures that the installed nose
+# comes first on sys.path .  So the only way to test a copy of nose other than
+# the installed one is to install that version (e.g. by running python setup.py
+# develop).
+
+# This script provides a way of running nose on nose's own tests without
+# installing the version to be tested, nor uninstalling the currently-installed
+# version.
+
+import os
+import sys
+
+
+if __name__ == "__main__":
+    this_dir = os.path.normpath(os.path.abspath(os.path.dirname(__file__)))
+    try:
+        import pkg_resources
+    except ImportError:
+        sys.path.insert(0, this_dir)
+    else:
+        env = pkg_resources.Environment(search_path=[this_dir])
+        distributions = env["nose"]
+        assert len(distributions) == 1
+        dist = distributions[0]
+        dist.activate()
+    import nose
+    nose.run_exit()