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Name	Size	Permission	Date
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Rename

"""Tests for the unparse.py script in the Tools/parser directory."""

import unittest
import test.support
import pathlib
import random
import tokenize
import ast

def read_pyfile(filename):
    """Read and return the contents of a Python source file (as a
    string), taking into account the file encoding."""
    with tokenize.open(filename) as stream:
        return stream.read()

for_else = """\
def f():
    for x in range(10):
        break
    else:
        y = 2
    z = 3
"""

while_else = """\
def g():
    while True:
        break
    else:
        y = 2
    z = 3
"""

relative_import = """\
from . import fred
from .. import barney
from .australia import shrimp as prawns
"""

nonlocal_ex = """\
def f():
    x = 1
    def g():
        nonlocal x
        x = 2
        y = 7
        def h():
            nonlocal x, y
"""

# also acts as test for 'except ... as ...'
raise_from = """\
try:
    1 / 0
except ZeroDivisionError as e:
    raise ArithmeticError from e
"""

class_decorator = """\
@f1(arg)
@f2
class Foo: pass
"""

elif1 = """\
if cond1:
    suite1
elif cond2:
    suite2
else:
    suite3
"""

elif2 = """\
if cond1:
    suite1
elif cond2:
    suite2
"""

try_except_finally = """\
try:
    suite1
except ex1:
    suite2
except ex2:
    suite3
else:
    suite4
finally:
    suite5
"""

try_except_star_finally = """\
try:
    suite1
except* ex1:
    suite2
except* ex2:
    suite3
else:
    suite4
finally:
    suite5
"""

with_simple = """\
with f():
    suite1
"""

with_as = """\
with f() as x:
    suite1
"""

with_two_items = """\
with f() as x, g() as y:
    suite1
"""

docstring_prefixes = (
    "",
    "class foo:\n    ",
    "def foo():\n    ",
    "async def foo():\n    ",
)

class ASTTestCase(unittest.TestCase):
    def assertASTEqual(self, ast1, ast2):
        # Ensure the comparisons start at an AST node
        self.assertIsInstance(ast1, ast.AST)
        self.assertIsInstance(ast2, ast.AST)

# An AST comparison routine modeled after ast.dump(), but
        # instead of string building, it traverses the two trees
        # in lock-step.
        def traverse_compare(a, b, missing=object()):
            if type(a) is not type(b):
                self.fail(f"{type(a)!r} is not {type(b)!r}")
            if isinstance(a, ast.AST):
                for field in a._fields:
                    value1 = getattr(a, field, missing)
                    value2 = getattr(b, field, missing)
                    # Singletons are equal by definition, so further
                    # testing can be skipped.
                    if value1 is not value2:
                        traverse_compare(value1, value2)
            elif isinstance(a, list):
                try:
                    for node1, node2 in zip(a, b, strict=True):
                        traverse_compare(node1, node2)
                except ValueError:
                    # Attempt a "pretty" error ala assertSequenceEqual()
                    len1 = len(a)
                    len2 = len(b)
                    if len1 > len2:
                        what = "First"
                        diff = len1 - len2
                    else:
                        what = "Second"
                        diff = len2 - len1
                    msg = f"{what} list contains {diff} additional elements."
                    raise self.failureException(msg) from None
            elif a != b:
                self.fail(f"{a!r} != {b!r}")
        traverse_compare(ast1, ast2)

def check_ast_roundtrip(self, code1, **kwargs):
        with self.subTest(code1=code1, ast_parse_kwargs=kwargs):
            ast1 = ast.parse(code1, **kwargs)
            code2 = ast.unparse(ast1)
            ast2 = ast.parse(code2, **kwargs)
            self.assertASTEqual(ast1, ast2)

def check_invalid(self, node, raises=ValueError):
        with self.subTest(node=node):
            self.assertRaises(raises, ast.unparse, node)

def get_source(self, code1, code2=None):
        code2 = code2 or code1
        code1 = ast.unparse(ast.parse(code1))
        return code1, code2

def check_src_roundtrip(self, code1, code2=None):
        code1, code2 = self.get_source(code1, code2)
        with self.subTest(code1=code1, code2=code2):
            self.assertEqual(code2, code1)

def check_src_dont_roundtrip(self, code1, code2=None):
        code1, code2 = self.get_source(code1, code2)
        with self.subTest(code1=code1, code2=code2):
            self.assertNotEqual(code2, code1)

class UnparseTestCase(ASTTestCase):
    # Tests for specific bugs found in earlier versions of unparse

def test_fstrings(self):
        self.check_ast_roundtrip("f'a'")
        self.check_ast_roundtrip("f'{{}}'")
        self.check_ast_roundtrip("f'{{5}}'")
        self.check_ast_roundtrip("f'{{5}}5'")
        self.check_ast_roundtrip("f'X{{}}X'")
        self.check_ast_roundtrip("f'{a}'")
        self.check_ast_roundtrip("f'{ {1:2}}'")
        self.check_ast_roundtrip("f'a{a}a'")
        self.check_ast_roundtrip("f'a{a}{a}a'")
        self.check_ast_roundtrip("f'a{a}a{a}a'")
        self.check_ast_roundtrip("f'{a!r}x{a!s}12{{}}{a!a}'")
        self.check_ast_roundtrip("f'{a:10}'")
        self.check_ast_roundtrip("f'{a:100_000{10}}'")
        self.check_ast_roundtrip("f'{a!r:10}'")
        self.check_ast_roundtrip("f'{a:a{b}10}'")
        self.check_ast_roundtrip(
                "f'a{b}{c!s}{d!r}{e!a}{f:a}{g:a{b}}{h!s:a}"
                "{j!s:{a}b}{k!s:a{b}c}{l!a:{b}c{d}}{x+y=}'"
        )

def test_fstrings_special_chars(self):
        # See issue 25180
        self.check_ast_roundtrip(r"""f'{f"{0}"*3}'""")
        self.check_ast_roundtrip(r"""f'{f"{y}"*3}'""")
        self.check_ast_roundtrip("""f''""")
        self.check_ast_roundtrip('''f"""'end' "quote\\""""''')

def test_fstrings_complicated(self):
        # See issue 28002
        self.check_ast_roundtrip("""f'''{"'"}'''""")
        self.check_ast_roundtrip('''f\'\'\'-{f"""*{f"+{f'.{x}.'}+"}*"""}-\'\'\'''')
        self.check_ast_roundtrip('''f\'\'\'-{f"""*{f"+{f'.{x}.'}+"}*"""}-'single quote\\'\'\'\'''')
        self.check_ast_roundtrip('f"""{\'\'\'\n\'\'\'}"""')
        self.check_ast_roundtrip('f"""{g(\'\'\'\n\'\'\')}"""')
        self.check_ast_roundtrip('''f"a\\r\\nb"''')
        self.check_ast_roundtrip('''f"\\u2028{'x'}"''')

def test_strings(self):
        self.check_ast_roundtrip("u'foo'")
        self.check_ast_roundtrip("r'foo'")
        self.check_ast_roundtrip("b'foo'")

def test_del_statement(self):
        self.check_ast_roundtrip("del x, y, z")

def test_shifts(self):
        self.check_ast_roundtrip("45 << 2")
        self.check_ast_roundtrip("13 >> 7")

def test_for_else(self):
        self.check_ast_roundtrip(for_else)

def test_while_else(self):
        self.check_ast_roundtrip(while_else)

def test_unary_parens(self):
        self.check_ast_roundtrip("(-1)**7")
        self.check_ast_roundtrip("(-1.)**8")
        self.check_ast_roundtrip("(-1j)**6")
        self.check_ast_roundtrip("not True or False")
        self.check_ast_roundtrip("True or not False")

def test_integer_parens(self):
        self.check_ast_roundtrip("3 .__abs__()")

def test_huge_float(self):
        self.check_ast_roundtrip("1e1000")
        self.check_ast_roundtrip("-1e1000")
        self.check_ast_roundtrip("1e1000j")
        self.check_ast_roundtrip("-1e1000j")

def test_nan(self):
        self.assertASTEqual(
            ast.parse(ast.unparse(ast.Constant(value=float('nan')))),
            ast.parse('1e1000 - 1e1000')
        )

def test_min_int(self):
        self.check_ast_roundtrip(str(-(2 ** 31)))
        self.check_ast_roundtrip(str(-(2 ** 63)))

def test_imaginary_literals(self):
        self.check_ast_roundtrip("7j")
        self.check_ast_roundtrip("-7j")
        self.check_ast_roundtrip("0j")
        self.check_ast_roundtrip("-0j")

def test_lambda_parentheses(self):
        self.check_ast_roundtrip("(lambda: int)()")

def test_chained_comparisons(self):
        self.check_ast_roundtrip("1 < 4 <= 5")
        self.check_ast_roundtrip("a is b is c is not d")

def test_function_arguments(self):
        self.check_ast_roundtrip("def f(): pass")
        self.check_ast_roundtrip("def f(a): pass")
        self.check_ast_roundtrip("def f(b = 2): pass")
        self.check_ast_roundtrip("def f(a, b): pass")
        self.check_ast_roundtrip("def f(a, b = 2): pass")
        self.check_ast_roundtrip("def f(a = 5, b = 2): pass")
        self.check_ast_roundtrip("def f(*, a = 1, b = 2): pass")
        self.check_ast_roundtrip("def f(*, a = 1, b): pass")
        self.check_ast_roundtrip("def f(*, a, b = 2): pass")
        self.check_ast_roundtrip("def f(a, b = None, *, c, **kwds): pass")
        self.check_ast_roundtrip("def f(a=2, *args, c=5, d, **kwds): pass")
        self.check_ast_roundtrip("def f(*args, **kwargs): pass")

def test_relative_import(self):
        self.check_ast_roundtrip(relative_import)

def test_nonlocal(self):
        self.check_ast_roundtrip(nonlocal_ex)

def test_raise_from(self):
        self.check_ast_roundtrip(raise_from)

def test_bytes(self):
        self.check_ast_roundtrip("b'123'")

def test_annotations(self):
        self.check_ast_roundtrip("def f(a : int): pass")
        self.check_ast_roundtrip("def f(a: int = 5): pass")
        self.check_ast_roundtrip("def f(*args: [int]): pass")
        self.check_ast_roundtrip("def f(**kwargs: dict): pass")
        self.check_ast_roundtrip("def f() -> None: pass")

def test_set_literal(self):
        self.check_ast_roundtrip("{'a', 'b', 'c'}")

def test_empty_set(self):
        self.assertASTEqual(
            ast.parse(ast.unparse(ast.Set(elts=[]))),
            ast.parse('{*()}')
        )

def test_set_comprehension(self):
        self.check_ast_roundtrip("{x for x in range(5)}")

def test_dict_comprehension(self):
        self.check_ast_roundtrip("{x: x*x for x in range(10)}")

def test_class_decorators(self):
        self.check_ast_roundtrip(class_decorator)

def test_class_definition(self):
        self.check_ast_roundtrip("class A(metaclass=type, *[], **{}): pass")

def test_elifs(self):
        self.check_ast_roundtrip(elif1)
        self.check_ast_roundtrip(elif2)

def test_try_except_finally(self):
        self.check_ast_roundtrip(try_except_finally)

def test_try_except_star_finally(self):
        self.check_ast_roundtrip(try_except_star_finally)

def test_starred_assignment(self):
        self.check_ast_roundtrip("a, *b, c = seq")
        self.check_ast_roundtrip("a, (*b, c) = seq")
        self.check_ast_roundtrip("a, *b[0], c = seq")
        self.check_ast_roundtrip("a, *(b, c) = seq")

def test_with_simple(self):
        self.check_ast_roundtrip(with_simple)

def test_with_as(self):
        self.check_ast_roundtrip(with_as)

def test_with_two_items(self):
        self.check_ast_roundtrip(with_two_items)

def test_dict_unpacking_in_dict(self):
        # See issue 26489
        self.check_ast_roundtrip(r"""{**{'y': 2}, 'x': 1}""")
        self.check_ast_roundtrip(r"""{**{'y': 2}, **{'x': 1}}""")

def test_slices(self):
        self.check_ast_roundtrip("a[i]")
        self.check_ast_roundtrip("a[i,]")
        self.check_ast_roundtrip("a[i, j]")
        # The AST for these next two both look like `a[(*a,)]`
        self.check_ast_roundtrip("a[(*a,)]")
        self.check_ast_roundtrip("a[*a]")
        self.check_ast_roundtrip("a[b, *a]")
        self.check_ast_roundtrip("a[*a, c]")
        self.check_ast_roundtrip("a[b, *a, c]")
        self.check_ast_roundtrip("a[*a, *a]")
        self.check_ast_roundtrip("a[b, *a, *a]")
        self.check_ast_roundtrip("a[*a, b, *a]")
        self.check_ast_roundtrip("a[*a, *a, b]")
        self.check_ast_roundtrip("a[b, *a, *a, c]")
        self.check_ast_roundtrip("a[(a:=b)]")
        self.check_ast_roundtrip("a[(a:=b,c)]")
        self.check_ast_roundtrip("a[()]")
        self.check_ast_roundtrip("a[i:j]")
        self.check_ast_roundtrip("a[:j]")
        self.check_ast_roundtrip("a[i:]")
        self.check_ast_roundtrip("a[i:j:k]")
        self.check_ast_roundtrip("a[:j:k]")
        self.check_ast_roundtrip("a[i::k]")
        self.check_ast_roundtrip("a[i:j,]")
        self.check_ast_roundtrip("a[i:j, k]")

def test_invalid_raise(self):
        self.check_invalid(ast.Raise(exc=None, cause=ast.Name(id="X")))

def test_invalid_fstring_value(self):
        self.check_invalid(
            ast.JoinedStr(
                values=[
                    ast.Name(id="test"),
                    ast.Constant(value="test")
                ]
            )
        )

def test_invalid_fstring_backslash(self):
        self.check_invalid(ast.FormattedValue(value=ast.Constant(value="\\\\")))

def test_invalid_yield_from(self):
        self.check_invalid(ast.YieldFrom(value=None))

def test_import_from_level_none(self):
        tree = ast.ImportFrom(module='mod', names=[ast.alias(name='x')])
        self.assertEqual(ast.unparse(tree), "from mod import x")
        tree = ast.ImportFrom(module='mod', names=[ast.alias(name='x')], level=None)
        self.assertEqual(ast.unparse(tree), "from mod import x")

def test_docstrings(self):
        docstrings = (
            'this ends with double quote"',
            'this includes a """triple quote"""',
            '\r',
            '\\r',
            '\t',
            '\\t',
            '\n',
            '\\n',
            '\r\\r\t\\t\n\\n',
            '""">>> content = \"\"\"blabla\"\"\" <<<"""',
            r'foo\n\x00',
            "' \\'\\'\\'\"\"\" \"\"\\'\\' \\'",
            '🐍⛎𩸽üéş^\\\\X\\\\BB\N{LONG RIGHTWARDS SQUIGGLE ARROW}'
        )
        for docstring in docstrings:
            # check as Module docstrings for easy testing
            self.check_ast_roundtrip(f"'''{docstring}'''")

def test_constant_tuples(self):
        self.check_src_roundtrip(ast.Constant(value=(1,), kind=None), "(1,)")
        self.check_src_roundtrip(
            ast.Constant(value=(1, 2, 3), kind=None), "(1, 2, 3)"
        )

def test_function_type(self):
        for function_type in (
            "() -> int",
            "(int, int) -> int",
            "(Callable[complex], More[Complex(call.to_typevar())]) -> None"
        ):
            self.check_ast_roundtrip(function_type, mode="func_type")

def test_type_comments(self):
        for statement in (
            "a = 5 # type:",
            "a = 5 # type: int",
            "a = 5 # type: int and more",
            "def x(): # type: () -> None\n\tpass",
            "def x(y): # type: (int) -> None and more\n\tpass",
            "async def x(): # type: () -> None\n\tpass",
            "async def x(y): # type: (int) -> None and more\n\tpass",
            "for x in y: # type: int\n\tpass",
            "async for x in y: # type: int\n\tpass",
            "with x(): # type: int\n\tpass",
            "async with x(): # type: int\n\tpass"
        ):
            self.check_ast_roundtrip(statement, type_comments=True)

def test_type_ignore(self):
        for statement in (
            "a = 5 # type: ignore",
            "a = 5 # type: ignore and more",
            "def x(): # type: ignore\n\tpass",
            "def x(y): # type: ignore and more\n\tpass",
            "async def x(): # type: ignore\n\tpass",
            "async def x(y): # type: ignore and more\n\tpass",
            "for x in y: # type: ignore\n\tpass",
            "async for x in y: # type: ignore\n\tpass",
            "with x(): # type: ignore\n\tpass",
            "async with x(): # type: ignore\n\tpass"
        ):
            self.check_ast_roundtrip(statement, type_comments=True)

class CosmeticTestCase(ASTTestCase):
    """Test if there are cosmetic issues caused by unnecessary additions"""

def test_simple_expressions_parens(self):
        self.check_src_roundtrip("(a := b)")
        self.check_src_roundtrip("await x")
        self.check_src_roundtrip("x if x else y")
        self.check_src_roundtrip("lambda x: x")
        self.check_src_roundtrip("1 + 1")
        self.check_src_roundtrip("1 + 2 / 3")
        self.check_src_roundtrip("(1 + 2) / 3")
        self.check_src_roundtrip("(1 + 2) * 3 + 4 * (5 + 2)")
        self.check_src_roundtrip("(1 + 2) * 3 + 4 * (5 + 2) ** 2")
        self.check_src_roundtrip("~x")
        self.check_src_roundtrip("x and y")
        self.check_src_roundtrip("x and y and z")
        self.check_src_roundtrip("x and (y and x)")
        self.check_src_roundtrip("(x and y) and z")
        self.check_src_roundtrip("(x ** y) ** z ** q")
        self.check_src_roundtrip("x >> y")
        self.check_src_roundtrip("x << y")
        self.check_src_roundtrip("x >> y and x >> z")
        self.check_src_roundtrip("x + y - z * q ^ t ** k")
        self.check_src_roundtrip("P * V if P and V else n * R * T")
        self.check_src_roundtrip("lambda P, V, n: P * V == n * R * T")
        self.check_src_roundtrip("flag & (other | foo)")
        self.check_src_roundtrip("not x == y")
        self.check_src_roundtrip("x == (not y)")
        self.check_src_roundtrip("yield x")
        self.check_src_roundtrip("yield from x")
        self.check_src_roundtrip("call((yield x))")
        self.check_src_roundtrip("return x + (yield x)")

def test_class_bases_and_keywords(self):
        self.check_src_roundtrip("class X:\n    pass")
        self.check_src_roundtrip("class X(A):\n    pass")
        self.check_src_roundtrip("class X(A, B, C, D):\n    pass")
        self.check_src_roundtrip("class X(x=y):\n    pass")
        self.check_src_roundtrip("class X(metaclass=z):\n    pass")
        self.check_src_roundtrip("class X(x=y, z=d):\n    pass")
        self.check_src_roundtrip("class X(A, x=y):\n    pass")
        self.check_src_roundtrip("class X(A, **kw):\n    pass")
        self.check_src_roundtrip("class X(*args):\n    pass")
        self.check_src_roundtrip("class X(*args, **kwargs):\n    pass")

def test_fstrings(self):
        self.check_src_roundtrip('''f\'\'\'-{f"""*{f"+{f'.{x}.'}+"}*"""}-\'\'\'''')
        self.check_src_roundtrip('''f"\\u2028{'x'}"''')
        self.check_src_roundtrip(r"f'{x}\n'")
        self.check_src_roundtrip('''f''\'{"""\n"""}\\n''\'''')
        self.check_src_roundtrip('''f''\'{f"""{x}\n"""}\\n''\'''')

def test_docstrings(self):
        docstrings = (
            '"""simple doc string"""',
            '''"""A more complex one
            with some newlines"""''',
            '''"""Foo bar baz

empty newline"""''',
            '"""With some \t"""',
            '"""Foo "bar" baz """',
            '"""\\r"""',
            '""""""',
            '"""\'\'\'"""',
            '"""\'\'\'\'\'\'"""',
            '"""🐍⛎𩸽üéş^\\\\X\\\\BB⟿"""',
            '"""end in single \'quote\'"""',
            "'''end in double \"quote\"'''",
            '"""almost end in double "quote"."""',
        )

for prefix in docstring_prefixes:
            for docstring in docstrings:
                self.check_src_roundtrip(f"{prefix}{docstring}")

def test_docstrings_negative_cases(self):
        # Test some cases that involve strings in the children of the
        # first node but aren't docstrings to make sure we don't have
        # False positives.
        docstrings_negative = (
            'a = """false"""',
            '"""false""" + """unless its optimized"""',
            '1 + 1\n"""false"""',
            'f"""no, top level but f-fstring"""'
        )
        for prefix in docstring_prefixes:
            for negative in docstrings_negative:
                # this cases should be result with single quote
                # rather then triple quoted docstring
                src = f"{prefix}{negative}"
                self.check_ast_roundtrip(src)
                self.check_src_dont_roundtrip(src)

def test_unary_op_factor(self):
        for prefix in ("+", "-", "~"):
            self.check_src_roundtrip(f"{prefix}1")
        for prefix in ("not",):
            self.check_src_roundtrip(f"{prefix} 1")

def test_slices(self):
        self.check_src_roundtrip("a[()]")
        self.check_src_roundtrip("a[1]")
        self.check_src_roundtrip("a[1, 2]")
        # Note that `a[*a]`, `a[*a,]`, and `a[(*a,)]` all evaluate to the same
        # thing at runtime and have the same AST, but only `a[*a,]` passes
        # this test, because that's what `ast.unparse` produces.
        self.check_src_roundtrip("a[*a,]")
        self.check_src_roundtrip("a[1, *a]")
        self.check_src_roundtrip("a[*a, 2]")
        self.check_src_roundtrip("a[1, *a, 2]")
        self.check_src_roundtrip("a[*a, *a]")
        self.check_src_roundtrip("a[1, *a, *a]")
        self.check_src_roundtrip("a[*a, 1, *a]")
        self.check_src_roundtrip("a[*a, *a, 1]")
        self.check_src_roundtrip("a[1, *a, *a, 2]")
        self.check_src_roundtrip("a[1:2, *a]")
        self.check_src_roundtrip("a[*a, 1:2]")

def test_lambda_parameters(self):
        self.check_src_roundtrip("lambda: something")
        self.check_src_roundtrip("four = lambda: 2 + 2")
        self.check_src_roundtrip("lambda x: x * 2")
        self.check_src_roundtrip("square = lambda n: n ** 2")
        self.check_src_roundtrip("lambda x, y: x + y")
        self.check_src_roundtrip("add = lambda x, y: x + y")
        self.check_src_roundtrip("lambda x, y, /, z, q, *, u: None")
        self.check_src_roundtrip("lambda x, *y, **z: None")

def test_star_expr_assign_target(self):
        for source_type, source in [
            ("single assignment", "{target} = foo"),
            ("multiple assignment", "{target} = {target} = bar"),
            ("for loop", "for {target} in foo:\n    pass"),
            ("async for loop", "async for {target} in foo:\n    pass")
        ]:
            for target in [
                "a",
                "a,",
                "a, b",
                "a, *b, c",
                "a, (b, c), d",
                "a, (b, c, d), *e",
                "a, (b, *c, d), e",
                "a, (b, *c, (d, e), f), g",
                "[a]",
                "[a, b]",
                "[a, *b, c]",
                "[a, [b, c], d]",
                "[a, [b, c, d], *e]",
                "[a, [b, *c, d], e]",
                "[a, [b, *c, [d, e], f], g]",
                "a, [b, c], d",
                "[a, b, (c, d), (e, f)]",
                "a, b, [*c], d, e"
            ]:
                with self.subTest(source_type=source_type, target=target):
                    self.check_src_roundtrip(source.format(target=target))

def test_star_expr_assign_target_multiple(self):
        self.check_src_roundtrip("() = []")
        self.check_src_roundtrip("[] = ()")
        self.check_src_roundtrip("() = [a] = c, = [d] = e, f = () = g = h")
        self.check_src_roundtrip("a = b = c = d")
        self.check_src_roundtrip("a, b = c, d = e, f = g")
        self.check_src_roundtrip("[a, b] = [c, d] = [e, f] = g")
        self.check_src_roundtrip("a, b = [c, d] = e, f = g")

def test_multiquote_joined_string(self):
        self.check_ast_roundtrip("f\"'''{1}\\\"\\\"\\\"\" ")
        self.check_ast_roundtrip("""f"'''{1}""\\"" """)
        self.check_ast_roundtrip("""f'""\"{1}''' """)
        self.check_ast_roundtrip("""f'""\"{1}""\\"' """)

class DirectoryTestCase(ASTTestCase):
    """Test roundtrip behaviour on all files in Lib and Lib/test."""

lib_dir = pathlib.Path(__file__).parent / ".."
    test_directories = (lib_dir, lib_dir / "test")
    run_always_files = {"test_grammar.py", "test_syntax.py", "test_compile.py",
                        "test_ast.py", "test_asdl_parser.py", "test_fstring.py",
                        "test_patma.py"}

_files_to_test = None

@classmethod
    def files_to_test(cls):

if cls._files_to_test is not None:
            return cls._files_to_test

items = [
            item.resolve()
            for directory in cls.test_directories
            for item in directory.glob("*.py")
            if not item.name.startswith("bad")
        ]

# Test limited subset of files unless the 'cpu' resource is specified.
        if not test.support.is_resource_enabled("cpu"):

tests_to_run_always = {item for item in items if
                                   item.name in cls.run_always_files}

items = set(random.sample(items, 10))

# Make sure that at least tests that heavily use grammar features are
            # always considered in order to reduce the chance of missing something.
            items = list(items | tests_to_run_always)

# bpo-31174: Store the names sample to always test the same files.
        # It prevents false alarms when hunting reference leaks.
        cls._files_to_test = items

return items

def test_files(self):
        for item in self.files_to_test():
            if test.support.verbose:
                print(f"Testing {item.absolute()}")

with self.subTest(filename=item):
                source = read_pyfile(item)
                self.check_ast_roundtrip(source)

if __name__ == "__main__":
    unittest.main()