package/python-pathspec: enable target variant

Also a runtime testcase is added.

Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>
[yann.morin.1998@free.fr:
  - fix check-package
  - small codign style in test sample
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

support/testing/tests/package/sample_python_pathspec.py

@@ -0,0 +1,36 @@
+# example from https://pypi.org/project/pathspec/
+
+import pathspec
+
+# The gitignore-style patterns for files to select, but we're including
+# instead of ignoring.
+spec_text = """
+
+# This is a comment because the line begins with a hash: "#"
+
+# Include several project directories (and all descendants) relative to
+# the current directory. To reference a directory you must end with a
+# slash: "/"
+/project-a/
+/project-b/
+/project-c/
+
+# Patterns can be negated by prefixing with exclamation mark: "!"
+
+# Ignore temporary files beginning or ending with "~" and ending with
+# ".swp".
+!~*
+!*~
+!*.swp
+
+# These are python projects so ignore compiled python files from
+# testing.
+!*.pyc
+
+# Ignore the build directories but only directly under the project
+# directories.
+!/*/build/
+
+"""
+
+spec = pathspec.PathSpec.from_lines('gitwildmatch', spec_text.splitlines())