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import inspect
import sys
def make_decorator(test_case_generator):
# `test_case_generator` is a callable that receives the source test class
# (typically a subclass of unittest.TestCase) and returns an iterable of
# generated test cases.
# Each element of the iterable is a 3-element tuple:
# [0] Generated class name
# [1] Dict of members
# [2] Method generator
# The method generator is also a callable that receives an original test
# method and returns a new test method.
def f(cls):
# The input is a bare test case
module_name = cls.__module__
# Generate parameterized test cases out of the input test case.
module = sys.modules[module_name]
assert module.__name__ == module_name
for cls_name, members, method_generator in test_case_generator(cls):
_generate_case(
cls, module, cls_name, members, method_generator)
# Remove original base class
return None
return f
def _generate_case(base, module, cls_name, mb, method_generator):
members = mb.copy()
base_methods = inspect.getmembers(base, predicate=inspect.isfunction)
for name, value in base_methods:
if not name.startswith('test_'):
continue
value = method_generator(value)
# If the return value of method_generator is None, None is assigned
# as the value of the test method and it is ignored by pytest.
members[name] = value
cls = type(cls_name, (base,), members)
# Add new test class to module
cls.__module__ = module.__name__
setattr(module, cls_name, cls)
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