pytest 是一个成熟的全功能的 Python 测试工具。
runs on Posix/Windows, Python 2.5-3.3, PyPy and Jython-2.5.1
zero-reported-bugs policy with >1000 tests against itself
strict backward compatibility policy for safe pytest upgrades
comprehensive online and PDF documentation
many third party plugins and builtin helpers,
used in many small and large projects and organisations
comes with many tested examples
