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test_checker.py

import ast

from pyflakes import checker
from pyflakes.test.harness import TestCase

class TypeableVisitorTests(TestCase):
    """
    Tests of L{_TypeableVisitor}
    """

@staticmethod
    def _run_visitor(s):
        """
        Run L{_TypeableVisitor} on the parsed source and return the visitor.
        """
        tree = ast.parse(s)
        visitor = checker._TypeableVisitor()
        visitor.visit(tree)
        return visitor

def test_node_types(self):
        """
        Test that the typeable node types are collected
        """
        visitor = self._run_visitor(
            """\
x = 1  # assignment
for x in range(1): pass  # for loop
def f(): pass  # function definition
with a as b: pass  # with statement
"""
        )
        self.assertEqual(visitor.typeable_lines, [1, 2, 3, 4])
        self.assertIsInstance(visitor.typeable_nodes[1], ast.Assign)
        self.assertIsInstance(visitor.typeable_nodes[2], ast.For)
        self.assertIsInstance(visitor.typeable_nodes[3], ast.FunctionDef)
        self.assertIsInstance(visitor.typeable_nodes[4], ast.With)

def test_visitor_recurses(self):
        """
        Test the common pitfall of missing `generic_visit` in visitors by
        ensuring that nested nodes are reported
        """
        visitor = self._run_visitor(
            """\
def f():
    x = 1
"""
        )
        self.assertEqual(visitor.typeable_lines, [1, 2])
        self.assertIsInstance(visitor.typeable_nodes[1], ast.FunctionDef)
        self.assertIsInstance(visitor.typeable_nodes[2], ast.Assign)

def test_py35_node_types(self):
        """
        Test that the PEP 492 node types are collected
        """
        visitor = self._run_visitor(
            """\
async def f():  # async def
    async for x in y:  pass  # async for
    async with a as b: pass  # async with
"""
        )
        self.assertEqual(visitor.typeable_lines, [1, 2, 3])
        self.assertIsInstance(visitor.typeable_nodes[1], ast.AsyncFunctionDef)
        self.assertIsInstance(visitor.typeable_nodes[2], ast.AsyncFor)
        self.assertIsInstance(visitor.typeable_nodes[3], ast.AsyncWith)

def test_last_node_wins(self):
        """
        Test that when two typeable nodes are present on a line, the last
        typeable one wins.
        """
        visitor = self._run_visitor('x = 1; y = 1')
        # detected both assignable nodes
        self.assertEqual(visitor.typeable_lines, [1, 1])
        # but the assignment to `y` wins
        self.assertEqual(visitor.typeable_nodes[1].targets[0].id, 'y')

class CollectTypeCommentsTests(TestCase):
    """
    Tests of L{_collect_type_comments}
    """

@staticmethod
    def _collect(s):
        """
        Run L{_collect_type_comments} on the parsed source and return the
        mapping from nodes to comments.  The return value is converted to
        a set: {(node_type, tuple of comments), ...}
        """
        tree = ast.parse(s)
        tokens = checker.make_tokens(s)
        ret = checker._collect_type_comments(tree, tokens)
        return {(type(k), tuple(s for _, s in v)) for k, v in ret.items()}

def test_bytes(self):
        """
        Test that the function works for binary source
        """
        ret = self._collect(b'x = 1  # type: int')
        self.assertSetEqual(ret, {(ast.Assign, ('# type: int',))})

def test_text(self):
        """
        Test that the function works for text source
        """
        ret = self._collect('x = 1  # type: int')
        self.assertEqual(ret, {(ast.Assign, ('# type: int',))})

def test_non_type_comment_ignored(self):
        """
        Test that a non-type comment is ignored
        """
        ret = self._collect('x = 1  # noqa')
        self.assertSetEqual(ret, set())

def test_type_comment_before_typeable(self):
        """
        Test that a type comment before something typeable is ignored.
        """
        ret = self._collect('# type: int\nx = 1')
        self.assertSetEqual(ret, set())

def test_type_ignore_comment_ignored(self):
        """
        Test that `# type: ignore` comments are not collected.
        """
        ret = self._collect('x = 1  # type: ignore')
        self.assertSetEqual(ret, set())

def test_type_ignore_with_other_things_ignored(self):
        """
        Test that `# type: ignore` comments with more content are also not
        collected.
        """
        ret = self._collect('x = 1  # type: ignore # noqa')
        self.assertSetEqual(ret, set())
        ret = self._collect('x = 1  #type:ignore#noqa')
        self.assertSetEqual(ret, set())

def test_type_comment_with_extra_still_collected(self):
        ret = self._collect('x = 1  # type: int  # noqa')
        self.assertSetEqual(ret, {(ast.Assign, ('# type: int  # noqa',))})

def test_type_comment_without_whitespace(self):
        ret = self._collect('x = 1 #type:int')
        self.assertSetEqual(ret, {(ast.Assign, ('#type:int',))})

def test_type_comment_starts_with_word_ignore(self):
        ret = self._collect('x = 1 # type: ignore[T]')
        self.assertSetEqual(ret, set())

def test_last_node_wins(self):
        """
        Test that when two typeable nodes are present on a line, the last
        typeable one wins.
        """
        ret = self._collect('def f(): x = 1  # type: int')
        self.assertSetEqual(ret, {(ast.Assign, ('# type: int',))})

def test_function_def_assigned_comments(self):
        """
        Test that type comments for function arguments are all attributed to
        the function definition.
        """
        ret = self._collect(
            """\
def f(
        a,  # type: int
        b,  # type: str
):
    # type: (...) -> None
    pass
"""
        )
        expected = {(
            ast.FunctionDef,
            ('# type: int', '# type: str', '# type: (...) -> None'),
        )}
        self.assertSetEqual(ret, expected)

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	0/0	0755	2026-02-11 05:02:23
..	dir	-	0/0	0755	2026-02-11 05:02:23
__pycache__	dir	-	0/0	0755	2026-02-11 05:02:23
__init__.py	application/x-empty	0 B	0/0	0644	2026-01-20 01:01:47
harness.py	text/x-script.python	1004 B	0/0	0644	2026-01-20 01:01:47
test_api.py	text/plain	26.27 KB	0/0	0644	2026-01-20 01:01:47
test_builtin.py	text/plain	582 B	0/0	0644	2026-01-20 01:01:47
test_checker.py	text/x-script.python	5.78 KB	0/0	0644	2026-01-20 01:01:47
test_code_segment.py	text/x-script.python	4.39 KB	0/0	0644	2026-01-20 01:01:47
test_dict.py	text/plain	5.15 KB	0/0	0644	2026-01-20 01:01:47
test_doctests.py	text/x-script.python	12.55 KB	0/0	0644	2026-01-20 01:01:47
test_imports.py	text/x-script.python	32.91 KB	0/0	0644	2026-01-20 01:01:47
test_is_literal.py	text/x-script.python	4.47 KB	0/0	0644	2026-01-20 01:01:47
test_match.py	text/x-script.python	2.05 KB	0/0	0644	2026-01-20 01:01:47
test_other.py	text/plain	50.48 KB	0/0	0644	2026-01-20 01:01:47
test_type_annotations.py	text/plain	19.83 KB	0/0	0644	2026-01-20 01:01:47
test_undefined_names.py	text/x-script.python	23.01 KB	0/0	0644	2026-01-20 01:01:47

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