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test_remove_explicit_return_none.py
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import ast
import sys
import pytest
from python_minifier import unparse
from python_minifier.ast_compare import compare_ast
from python_minifier.transforms.remove_explicit_return_none import RemoveExplicitReturnNone
def remove_return_none(source):
module = ast.parse(source, 'remove_return_none')
return RemoveExplicitReturnNone()(module)
def test_trailing_remove_return_none():
source = 'def a():a=4;return None'
expected = 'def a():a=4'
expected_ast = ast.parse(expected)
actual_ast = remove_return_none(source)
compare_ast(expected_ast, actual_ast)
assert unparse(actual_ast) == expected
def test_trailing_implicit_return_none():
source = 'def a():a=4;return'
expected = 'def a():a=4'
expected_ast = ast.parse(expected)
actual_ast = remove_return_none(source)
compare_ast(expected_ast, actual_ast)
assert unparse(actual_ast) == expected
def test_trailing_remove_return_none_empty_suite():
source = 'def a():return None'
expected = 'def a():0'
expected_ast = ast.parse(expected)
actual_ast = remove_return_none(source)
compare_ast(expected_ast, actual_ast)
assert unparse(actual_ast) == expected
def test_trailing_implicit_return_none_empty_suite():
source = 'def a():return'
expected = 'def a():0'
expected_ast = ast.parse(expected)
actual_ast = remove_return_none(source)
compare_ast(expected_ast, actual_ast)
assert unparse(actual_ast) == expected
def test_trailing_return_value_unchanged():
source = 'def a():return 0'
expected = source
expected_ast = ast.parse(expected)
actual_ast = remove_return_none(source)
compare_ast(expected_ast, actual_ast)
assert unparse(actual_ast) == expected
def test_remove_return_none():
source = '''
def a():
if a: return None
return None
'''
expected = 'def a():\n\tif a:return'
expected_ast = ast.parse(expected)
actual_ast = remove_return_none(source)
compare_ast(expected_ast, actual_ast)
assert unparse(actual_ast) == expected
def test_implicit_return_none():
source = '''
def a():
if a: return
return
'''
expected = 'def a():\n\tif a:return'
expected_ast = ast.parse(expected)
actual_ast = remove_return_none(source)
compare_ast(expected_ast, actual_ast)
assert unparse(actual_ast) == expected
def test_return_value_unchanged():
source = '''
def a():
if a: return 1
return 3
'''
expected = 'def a():\n\tif a:return 1\n\treturn 3'
expected_ast = ast.parse(expected)
actual_ast = remove_return_none(source)
compare_ast(expected_ast, actual_ast)
assert unparse(actual_ast) == expected
def test_async_trailing_remove_return_none():
if sys.version_info < (3, 5):
pytest.skip('Async not allowed in python < 3.5')
source = 'async def a():a=4;return None'
expected = 'async def a():a=4'
expected_ast = ast.parse(expected)
actual_ast = remove_return_none(source)
compare_ast(expected_ast, actual_ast)
assert unparse(actual_ast) == expected
def test_async_trailing_implicit_return_none():
if sys.version_info < (3, 5):
pytest.skip('Async not allowed in python < 3.5')
source = 'async def a():a=4;return'
expected = 'async def a():a=4'
expected_ast = ast.parse(expected)
actual_ast = remove_return_none(source)
compare_ast(expected_ast, actual_ast)
assert unparse(actual_ast) == expected
def test_async_trailing_remove_return_none_empty_suite():
if sys.version_info < (3, 5):
pytest.skip('Async not allowed in python < 3.5')
source = 'async def a():return None'
expected = 'async def a():0'
expected_ast = ast.parse(expected)
actual_ast = remove_return_none(source)
compare_ast(expected_ast, actual_ast)
assert unparse(actual_ast) == expected
def test_async_trailing_implicit_return_none_empty_suite():
if sys.version_info < (3, 5):
pytest.skip('Async not allowed in python < 3.5')
source = 'async def a():return'
expected = 'async def a():0'
expected_ast = ast.parse(expected)
actual_ast = remove_return_none(source)
compare_ast(expected_ast, actual_ast)
assert unparse(actual_ast) == expected
def test_async_trailing_return_value_unchanged():
if sys.version_info < (3, 5):
pytest.skip('Async not allowed in python < 3.5')
source = 'async def a():return 0'
expected = source
expected_ast = ast.parse(expected)
actual_ast = remove_return_none(source)
compare_ast(expected_ast, actual_ast)
assert unparse(actual_ast) == expected
def test_async_remove_return_none():
if sys.version_info < (3, 5):
pytest.skip('Async not allowed in python < 3.5')
source = '''
async def a():
if a: return None
return None
'''
expected = 'async def a():\n\tif a:return'
expected_ast = ast.parse(expected)
actual_ast = remove_return_none(source)
compare_ast(expected_ast, actual_ast)
assert unparse(actual_ast) == expected
def test_async_implicit_return_none():
if sys.version_info < (3, 5):
pytest.skip('Async not allowed in python < 3.5')
source = '''
async def a():
if a: return
return
'''
expected = 'async def a():\n\tif a:return'
expected_ast = ast.parse(expected)
actual_ast = remove_return_none(source)
compare_ast(expected_ast, actual_ast)
assert unparse(actual_ast) == expected
def test_async_return_value_unchanged():
if sys.version_info < (3, 5):
pytest.skip('Async not allowed in python < 3.5')
source = '''
async def a():
if a: return 1
return 3
'''
expected = 'async def a():\n\tif a:return 1\n\treturn 3'
expected_ast = ast.parse(expected)
actual_ast = remove_return_none(source)
compare_ast(expected_ast, actual_ast)
assert unparse(actual_ast) == expected