Add tests for rez.utils.pip (76% covered with branches)

.coveragerc

@@ -0,0 +1,6 @@
+[run]
+branch = True
+omit =
+    src/rez/tests/*,
+    src/rez/completion/*,
+    src/rez/vendor/*

.gitignore

@@ -6,6 +6,8 @@
 src/rez.egg-info/
 build/
 dist/
+htmlcov/
+.coverage
 *~
 docs/_build
 .DS_Store

pytest.ini

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+[pytest]
+addopts = --cov=src/rez --cov-report=html --cov-config=.coveragerc

src/rez/tests/data/pip/installed_distributions/six-1.12.0.dist-info/INSTALLER

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+pip

src/rez/tests/data/pip/installed_distributions/six-1.12.0.dist-info/LICENSE

@@ -0,0 +1,18 @@
+Copyright (c) 2010-2018 Benjamin Peterson
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

src/rez/tests/data/pip/installed_distributions/six-1.12.0.dist-info/METADATA

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+Metadata-Version: 2.1
+Name: six
+Version: 1.12.0
+Summary: Python 2 and 3 compatibility utilities
+Home-page: https://github.com/benjaminp/six
+Author: Benjamin Peterson
+Author-email: benjamin@python.org
+License: MIT
+Platform: UNKNOWN
+Classifier: Development Status :: 5 - Production/Stable
+Classifier: Programming Language :: Python :: 2
+Classifier: Programming Language :: Python :: 3
+Classifier: Intended Audience :: Developers
+Classifier: License :: OSI Approved :: MIT License
+Classifier: Topic :: Software Development :: Libraries
+Classifier: Topic :: Utilities
+Requires-Python: >=2.6, !=3.0.*, !=3.1.*
+
+.. image:: https://img.shields.io/pypi/v/six.svg
+   :target: https://pypi.org/project/six/
+   :alt: six on PyPI
+
+.. image:: https://travis-ci.org/benjaminp/six.svg?branch=master
+   :target: https://travis-ci.org/benjaminp/six
+   :alt: six on TravisCI
+
+.. image:: https://readthedocs.org/projects/six/badge/?version=latest
+   :target: https://six.readthedocs.io/
+   :alt: six's documentation on Read the Docs
+
+.. image:: https://img.shields.io/badge/license-MIT-green.svg
+   :target: https://github.com/benjaminp/six/blob/master/LICENSE
+   :alt: MIT License badge
+
+Six is a Python 2 and 3 compatibility library.  It provides utility functions
+for smoothing over the differences between the Python versions with the goal of
+writing Python code that is compatible on both Python versions.  See the
+documentation for more information on what is provided.
+
+Six supports every Python version since 2.6.  It is contained in only one Python
+file, so it can be easily copied into your project. (The copyright and license
+notice must be retained.)
+
+Online documentation is at https://six.readthedocs.io/.
+
+Bugs can be reported to https://github.com/benjaminp/six.  The code can also
+be found there.
+
+For questions about six or porting in general, email the python-porting mailing
+list: https://mail.python.org/mailman/listinfo/python-porting
+
+

src/rez/tests/data/pip/installed_distributions/six-1.12.0.dist-info/RECORD

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+six-1.12.0.dist-info/INSTALLER,sha256=zuuue4knoyJ-UwPPXg8fezS7VCrXJQrAP7zeNuwvFQg,4
+six-1.12.0.dist-info/LICENSE,sha256=5zL1TaWPPpzwxI6LUSlIk2_Pc2G9WK-mOpo8OSv3lK0,1066
+six-1.12.0.dist-info/METADATA,sha256=CRdYkKPKCFJr7-qA8PDpBklGXfXJ3xu4mu5tkLBDL04,1940
+six-1.12.0.dist-info/RECORD,,
+six-1.12.0.dist-info/WHEEL,sha256=_wJFdOYk7i3xxT8ElOkUJvOdOvfNGbR9g-bf6UQT6sU,110
+six-1.12.0.dist-info/top_level.txt,sha256=_iVH_iYEtEXnD8nYGQYpYFUvkUW9sEO1GYbkeKSAais,4
+six.py,sha256=h9jch2pS86y4R36pKRS3LOYUCVFNIJMRwjZ4fJDtJ44,32452
+six.pyc,,

src/rez/tests/data/pip/installed_distributions/six-1.12.0.dist-info/WHEEL

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+Wheel-Version: 1.0
+Generator: bdist_wheel (0.32.3)
+Root-Is-Purelib: true
+Tag: py2-none-any
+Tag: py3-none-any
+

src/rez/tests/data/pip/installed_distributions/six-1.12.0.dist-info/top_level.txt

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+six