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import subprocess
import sys
import unittest
from typing import Dict, List, Tuple
class TomliInstallTestCase(unittest.TestCase):
def test_correct_tomli_version_installed(self):
python_major, python_minor = self.__get_current_python_version()
packages = self.__get_installed_pip_packages()
tomli_version = packages.get('tomli')
v1_regex = r'1.[0-9]+.[0-9]+'
v2_regex = r'2.[0-9]+.[0-9]+'
if python_major == 3 and python_minor == 6:
self.assertRegex(tomli_version, v1_regex)
elif python_major == 3 and python_minor >= 7:
self.assertRegex(tomli_version, v2_regex)
else:
self.fail("Executed with invalid Python version")
def __get_current_python_version(self) -> Tuple[int, int]:
python_version = sys.version_info
return python_version.major, python_version.minor
def __get_installed_pip_packages(self) -> Dict[str, str]:
cmd = "pip list"
process = subprocess.Popen(
cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE
)
stdout, _ = process.communicate()
exit_code = process.returncode
if exit_code != 0:
raise RuntimeError(
'listing pip packages got a non-zero exit code'
)
result = {}
packages = self.__remove_pip_list_table_header(stdout.splitlines())
for package in packages:
decoded_package = package.decode('utf-8')
name, version, *_ = decoded_package.split()
result[name] = version
return result
def __remove_pip_list_table_header(self, lines: List[bytes]) -> List[bytes]:
return lines[2:]
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