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import os
import sys
import unittest

sys.path.insert(0, os.getcwd())


class TestLoader(unittest.TestLoader):

    def prepare_test_decimal(self, module):
        # Taken from test_main() in test_decimal.py
        module.init(module.C)
        module.init(module.P)
        module.TEST_ALL = True
        module.DEBUG = None
        for filename in os.listdir(module.directory):
            if '.decTest' not in filename or filename.startswith("."):
                continue
            head, tail = filename.split('.')
            tester = lambda self, f=filename: self.eval_file(module.directory + f)
            setattr(module.CIBMTestCases, 'test_' + head, tester)
            setattr(module.PyIBMTestCases, 'test_' + head, tester)
            del filename, head, tail, tester
        return self.suiteClass(self.loadTestsFromTestCase(cls) for cls in module.all_tests)

    def loadTestsFromModule(self, module, pattern=None):
        if module.__name__.endswith('test_decimal'):
            return self.prepare_test_decimal(module)
        if module.__name__.endswith('test_multiprocessing_spawn'):
            sys.path.insert(1, os.path.dirname(module.__name__.replace(".", "/")))
            import _test_multiprocessing
            sys.modules['__main__'] = _test_multiprocessing
        suite = super().loadTestsFromModule(module, pattern=pattern)
        test_main = getattr(module, 'test_main', None)
        if callable(test_main):
            class TestMain(unittest.TestCase):
                pass

            TestMain.__module__ = test_main.__module__
            TestMain.__qualname__ = TestMain.__name__
            TestMain.test_main = staticmethod(test_main)
            suite.addTests(self.loadTestsFromTestCase(TestMain))
        return suite


# We would normmally just pass the loader to the main, but there are tests for the framework itself (test_unittest)
# that interact weirdly with non-default loaders
unittest.defaultTestLoader = TestLoader()
unittest.main(module=None, testLoader=unittest.defaultTestLoader)
