"""Run the unit tests."""
import unittest
import sys


def iterate_test_cases(test_suite_or_case):
    """Iterate through all of the test cases in 'test_suite_or_case'."""
    try:
        suite = iter(test_suite_or_case)
    except TypeError:
        yield test_suite_or_case
    else:
        for t in suite:
            for subtest in iterate_test_cases(t):
                yield subtest


test_cases = unittest.TestLoader().discover('tests', pattern='test_*.py')

not_skipped_cases = []
only_cases = []
for ts in iterate_test_cases(test_cases):
    case_name = ts.id()
    case_class_name = ts.__class__.__name__
    if not (case_class_name.endswith('__skip') or case_name.endswith('__skip')):
        if case_class_name.endswith('__only') or case_name.endswith('__only'):
            only_cases.append(ts)
        else:
            not_skipped_cases.append(ts)

final_test_cases = []
if len(only_cases) > 0:
    final_test_cases = only_cases
else:
    final_test_cases = not_skipped_cases

test_suite = unittest.TestSuite()
test_suite.addTests(final_test_cases)

result = unittest.TextTestRunner(verbosity=2).run(test_suite)

if not result.wasSuccessful():
    sys.exit(1)