90 lines
3.0 KiB
Python
90 lines
3.0 KiB
Python
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# coding=utf-8
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"""Useful stuff for tests."""
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# Copyright 2017 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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import ast
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import sys
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import unittest
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from six.moves import zip
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class TestCase(unittest.TestCase):
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def checkAstsEqual(self, a, b):
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"""Compares two ASTs and fails if there are differences.
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Ignores `ctx` fields and formatting info.
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"""
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if a is None and b is None:
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return
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try:
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self.assertIsNotNone(a)
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self.assertIsNotNone(b)
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for node_a, node_b in zip(ast.walk(a), ast.walk(b)):
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self.assertEqual(type(node_a), type(node_b))
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for field in type(node_a)()._fields:
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a_val = getattr(node_a, field, None)
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b_val = getattr(node_b, field, None)
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if isinstance(a_val, list):
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for item_a, item_b in zip(a_val, b_val):
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self.checkAstsEqual(item_a, item_b)
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elif isinstance(a_val, ast.AST) or isinstance(b_val, ast.AST):
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if (not isinstance(a_val, (ast.Load, ast.Store, ast.Param)) and
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not isinstance(b_val, (ast.Load, ast.Store, ast.Param))):
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self.assertIsNotNone(a_val)
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self.assertIsNotNone(b_val)
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self.checkAstsEqual(a_val, b_val)
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else:
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self.assertEqual(a_val, b_val)
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except AssertionError as ae:
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self.fail('ASTs differ:\n%s\n !=\n%s\n\n%s' % (
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ast.dump(a), ast.dump(b), ae))
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if not hasattr(TestCase, 'assertItemsEqual'):
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setattr(TestCase, 'assertItemsEqual', TestCase.assertCountEqual)
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def requires_features(*features):
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return unittest.skipIf(
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any(not supports_feature(feature) for feature in features),
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'Tests features which are not supported by this version of python. '
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'Missing: %r' % [f for f in features if not supports_feature(f)])
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def supports_feature(feature):
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if feature == 'bytes_node':
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return hasattr(ast, 'Bytes') and issubclass(ast.Bytes, ast.AST)
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if feature == 'exec_node':
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return hasattr(ast, 'Exec') and issubclass(ast.Exec, ast.AST)
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if feature == 'type_annotations':
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try:
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ast.parse('def foo(bar: str=123) -> None: pass')
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except SyntaxError:
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return False
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return True
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if feature == 'fstring':
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return hasattr(ast, 'JoinedStr') and issubclass(ast.JoinedStr, ast.AST)
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# Python 2 counts tabs as 8 spaces for indentation
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if feature == 'mixed_tabs_spaces':
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return sys.version_info[0] < 3
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return False
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