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# This file is part of Hypothesis, which may be found at
# https://github.com/HypothesisWorks/hypothesis/
#
# Copyright the Hypothesis Authors.
# Individual contributors are listed in AUTHORS.rst and the git log.
#
# This Source Code Form is subject to the terms of the Mozilla Public License,
# v. 2.0. If a copy of the MPL was not distributed with this file, You can
# obtain one at https://mozilla.org/MPL/2.0/.
from hypothesis.internal.conjecture.utils import identity
from hypothesis.internal.reflection import get_pretty_function_description
def test_bracket_whitespace_is_striped():
assert get_pretty_function_description(lambda x: (x + 1)) == "lambda x: (x + 1)"
def test_no_whitespace_before_colon_with_no_args():
assert get_pretty_function_description(eval("lambda: None")) == "lambda: <unknown>"
def test_can_have_unicode_in_lambda_sources():
t = lambda x: "é" not in x
assert get_pretty_function_description(t) == 'lambda x: "é" not in x'
# fmt: off
ordered_pair = (
lambda right: [].map(
lambda length: ()))
# fmt: on
def test_can_get_descriptions_of_nested_lambdas_with_different_names():
assert (
get_pretty_function_description(ordered_pair)
== "lambda right: [].map(lambda length: ())"
)
def test_does_not_error_on_unparsable_source():
# fmt: off
t = [
lambda x: \
# This will break ast.parse, but the brackets are needed for the real
# parser to accept this lambda
x][0]
# fmt: on
assert get_pretty_function_description(t) == "lambda x: <unknown>"
def test_source_of_lambda_is_pretty():
assert get_pretty_function_description(lambda x: True) == "lambda x: True"
def test_variable_names_are_not_pretty():
t = lambda x: True
assert get_pretty_function_description(t) == "lambda x: True"
def test_does_not_error_on_dynamically_defined_functions():
x = eval("lambda t: 1")
get_pretty_function_description(x)
def test_collapses_whitespace_nicely():
# fmt: off
t = (
lambda x, y: 1
)
# fmt: on
assert get_pretty_function_description(t) == "lambda x, y: 1"
def test_is_not_confused_by_tuples():
p = (lambda x: x > 1, 2)[0]
assert get_pretty_function_description(p) == "lambda x: x > 1"
def test_strips_comments_from_the_end():
t = lambda x: 1 # A lambda comment
assert get_pretty_function_description(t) == "lambda x: 1"
def test_does_not_strip_hashes_within_a_string():
t = lambda x: "#"
assert get_pretty_function_description(t) == 'lambda x: "#"'
def test_can_distinguish_between_two_lambdas_with_different_args():
a, b = (lambda x: 1, lambda y: 2)
assert get_pretty_function_description(a) == "lambda x: 1"
assert get_pretty_function_description(b) == "lambda y: 2"
def test_does_not_error_if_it_cannot_distinguish_between_two_lambdas():
a, b = (lambda x: 1, lambda x: 2)
assert "lambda x:" in get_pretty_function_description(a)
assert "lambda x:" in get_pretty_function_description(b)
def test_lambda_source_break_after_def_with_brackets():
# fmt: off
f = (lambda n:
'aaa')
# fmt: on
source = get_pretty_function_description(f)
assert source == "lambda n: 'aaa'"
def test_lambda_source_break_after_def_with_line_continuation():
# fmt: off
f = lambda n:\
'aaa'
# fmt: on
source = get_pretty_function_description(f)
assert source == "lambda n: 'aaa'"
def arg_decorator(*s):
def accept(f):
return s
return accept
@arg_decorator(lambda x: x + 1)
def plus_one():
pass
@arg_decorator(lambda x: x + 1, lambda y: y * 2)
def two_decorators():
pass
def test_can_extract_lambda_repr_in_a_decorator():
assert get_pretty_function_description(plus_one[0]) == "lambda x: x + 1"
def test_can_extract_two_lambdas_from_a_decorator_if_args_differ():
a, b = two_decorators
assert get_pretty_function_description(a) == "lambda x: x + 1"
assert get_pretty_function_description(b) == "lambda y: y * 2"
@arg_decorator(lambda x: x + 1)
def decorator_with_space():
pass
def test_can_extract_lambda_repr_in_a_decorator_with_spaces():
assert get_pretty_function_description(decorator_with_space[0]) == "lambda x: x + 1"
@arg_decorator(lambda: ())
def to_brackets():
pass
def test_can_handle_brackets_in_decorator_argument():
assert get_pretty_function_description(to_brackets[0]) == "lambda: ()"
@arg_decorator(identity(lambda x: x + 1))
def decorator_with_wrapper():
pass
def test_can_handle_nested_lambda_in_decorator_argument():
assert (
get_pretty_function_description(decorator_with_wrapper[0]) == "lambda x: x + 1"
)
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