python-unittest2: Copy deleted package over from guix mainline

Certain packages in guix-bioinformatics have `python-unittest2` as a
dependency, but the package was deleted from guix mainline.

This commit copies the deleted package definition over to
guix-bioinformatics and includes the module where the package is used.

1 files changed, 46 insertions, 0 deletions

diff --git a/gn/packages/patches/python-unittest2-python3-compat.patch b/gn/packages/patches/python-unittest2-python3-compat.patch
new file mode 100644
index 0000000..68fbcca
--- /dev/null
+++ b/gn/packages/patches/python-unittest2-python3-compat.patch
@@ -0,0 +1,46 @@
+Skip tests that fail with newer versions of Python.
+
+Patch copied from Gentoo:
+
+https://gitweb.gentoo.org/repo/gentoo.git/tree/dev-python/unittest2/files/unittest2-1.1.0-python3.5-test.patch
+
+diff --git a/unittest2/test/test_loader.py b/unittest2/test/test_loader.py
+index 683f662..347eea5 100644
+--- a/unittest2/test/test_loader.py
++++ b/unittest2/test/test_loader.py
+@@ -509,6 +509,7 @@ class Test_TestLoader(unittest2.TestCase):
+     #
+     # What happens when an impossible name is given, relative to the provided
+     # `module`?
++    @unittest.skipIf(sys.version_info[:2] >= (3, 5), "python 3.5 has problems here")
+     def test_loadTestsFromName__relative_malformed_name(self):
+         loader = unittest.TestLoader()
+ 
+@@ -811,6 +812,7 @@ class Test_TestLoader(unittest2.TestCase):
+     # TestCase or TestSuite instance."
+     #
+     # What happens when presented with an impossible module name?
++    @unittest.skipIf(sys.version_info[:2] >= (3, 5), "python 3.5 has problems here")
+     def test_loadTestsFromNames__malformed_name(self):
+         loader = unittest2.TestLoader()
+ 
+@@ -918,6 +920,7 @@ class Test_TestLoader(unittest2.TestCase):
+     # "The method optionally resolves name relative to the given module"
+     #
+     # What happens when presented with an impossible attribute name?
++    @unittest.skipIf(sys.version_info[:2] >= (3, 5), "python 3.5 has problems here")
+     def test_loadTestsFromNames__relative_malformed_name(self):
+         loader = unittest.TestLoader()
+ 
+diff --git a/unittest2/compatibility.py b/unittest2/compatibility.py
+index 9e5f1a5..2d20c19 100644
+--- a/unittest2/compatibility.py
++++ b/unittest2/compatibility.py
+@@ -140,6 +140,6 @@ except ImportError:
+ ###  ChainMap (helper for configparser and string.Template)
+ ########################################################################
+ 
+-class ChainMap(collections.MutableMapping):
++class ChainMap(collections.abc.MutableMapping):
+     ''' A ChainMap groups multiple dicts (or other mappings) together
+     to create a single, updateable view.