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fix: addition of the keywords async and await for generated asynchronous functions #455

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fix: addition of the keywords async and await for generated asynchronous functions #455

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7bbd9ba
fix: addition of the keywords async and await for generated asynchron…
Julien-Delavisse Dec 2, 2025
1e92cf8
Merge branch 'boxed:main' into fix/454-async-functions-generated-tram…
Julien-Delavisse Dec 3, 2025
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2 changes: 1 addition & 1 deletion src/mutmut/file_mutation.py
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Original file line number Diff line number Diff line change
Expand Up @@ -248,7 +248,7 @@ def function_trampoline_arrangement(function: cst.FunctionDef, mutants: Iterable
nodes.append(mutated_method) # type: ignore

# trampoline that forwards the calls
trampoline = list(cst.parse_module(build_trampoline(orig_name=name, mutants=mutant_names, class_name=class_name)).body)
trampoline = list(cst.parse_module(build_trampoline(orig_name=name, mutants=mutant_names, class_name=class_name, asynchronous=function.asynchronous)).body)
trampoline[0] = trampoline[0].with_changes(leading_lines=[cst.EmptyLine()])
nodes.extend(trampoline)

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6 changes: 3 additions & 3 deletions src/mutmut/trampoline_templates.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
CLASS_NAME_SEPARATOR = 'ǁ'

def build_trampoline(*, orig_name, mutants, class_name):
def build_trampoline(*, orig_name, mutants, class_name, asynchronous):
mangled_name = mangle_function_name(name=orig_name, class_name=class_name)

mutants_dict = f'{mangled_name}__mutmut_mutants : ClassVar[MutantDict] = {{\n' + ', \n '.join(f'{repr(m)}: {m}' for m in mutants) + '\n}'
Expand All @@ -17,8 +17,8 @@ def build_trampoline(*, orig_name, mutants, class_name):
return f"""
{mutants_dict}

def {orig_name}({'self, ' if class_name is not None else ''}*args, **kwargs):
result = {trampoline_name}({access_prefix}{mangled_name}__mutmut_orig{access_suffix}, {access_prefix}{mangled_name}__mutmut_mutants{access_suffix}, args, kwargs{self_arg})
{'async ' if asynchronous is not None else ''}def {orig_name}({'self, ' if class_name is not None else ''}*args, **kwargs):
result = {'await ' if asynchronous is not None else ''} {trampoline_name}({access_prefix}{mangled_name}__mutmut_orig{access_suffix}, {access_prefix}{mangled_name}__mutmut_mutants{access_suffix}, args, kwargs{self_arg})
return result

{orig_name}.__signature__ = _mutmut_signature({mangled_name}__mutmut_orig)
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