"""Test availability of required packages."""

import unittest

import os

from pathlib import Path

import pkg_resources

parent_path = Path(__file__).parent.parent

requirements_path_os = os.path.join(parent_path,"requirements.txt")

print("Parent       Path = {}".format(parent_path))

print("Requirements Path = {}".format(requirements_path_os))

_REQUIREMENTS_PATH = Path(requirements_path_os)

class TestRequirements(unittest.TestCase):

    """Test availability of required packages."""

    def test_requirements(self):

        """Test that each required package is available."""

        # Ref: https://stackoverflow.com/a/45474387/

        requirements = pkg_resources.parse_requirements(_REQUIREMENTS_PATH.open())

        for requirement in requirements:

            requirement = str(requirement)

            print("Check Requirement ==> {}".format(requirement))

            with self.subTest(requirement=requirement):

                pkg_resources.require(requirement)