djavu-asus/emacs/elpy/rpc-venv/lib/python3.11/site-packages/yapftests/main_test.py

   1 # -*- coding: utf-8 -*-
   2 # Copyright 2015 Google Inc. All Rights Reserved.
   3 #
   4 # Licensed under the Apache License, Version 2.0 (the "License");
   5 # you may not use this file except in compliance with the License.
   6 # You may obtain a copy of the License at
   7 #
   8 #     http://www.apache.org/licenses/LICENSE-2.0
   9 #
  10 # Unless required by applicable law or agreed to in writing, software
  11 # distributed under the License is distributed on an "AS IS" BASIS,
  12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 # See the License for the specific language governing permissions and
  14 # limitations under the License.
  15 """Tests for yapf.__init__.main."""
  16
  17 import sys
  18 import unittest
  19 from contextlib import contextmanager
  20 from io import StringIO
  21
  22 import yapf
  23
  24 from yapftests import yapf_test_helper
  25
  26
  27 class IO(object):
  28   """IO is a thin wrapper around StringIO.
  29
  30   This is strictly to wrap the Python 3 StringIO object so that it can supply a
  31   "buffer" attribute.
  32   """
  33
  34   class Buffer(object):
  35
  36     def __init__(self):
  37       self.string_io = StringIO()
  38
  39     def write(self, s):
  40       if isinstance(s, bytes):
  41         s = str(s, 'utf-8')
  42       self.string_io.write(s)
  43
  44     def getvalue(self):
  45       return self.string_io.getvalue()
  46
  47   def __init__(self):
  48     self.buffer = self.Buffer()
  49
  50   def write(self, s):
  51     self.buffer.write(s)
  52
  53   def getvalue(self):
  54     return self.buffer.getvalue()
  55
  56
  57 @contextmanager
  58 def captured_output():
  59   new_out, new_err = IO(), IO()
  60   old_out, old_err = sys.stdout, sys.stderr
  61   try:
  62     sys.stdout, sys.stderr = new_out, new_err
  63     yield sys.stdout, sys.stderr
  64   finally:
  65     sys.stdout, sys.stderr = old_out, old_err
  66
  67
  68 @contextmanager
  69 def patched_input(code):
  70   """Monkey patch code as though it were coming from stdin."""
  71
  72   def lines():
  73     for line in code.splitlines():
  74       yield line
  75     raise EOFError()
  76
  77   def patch_raw_input(lines=lines()):
  78     return next(lines)
  79
  80   try:
  81     orig_raw_import = yapf._raw_input
  82     yapf._raw_input = patch_raw_input
  83     yield
  84   finally:
  85     yapf._raw_input = orig_raw_import
  86
  87
  88 class RunMainTest(yapf_test_helper.YAPFTest):
  89
  90   def testShouldHandleYapfError(self):
  91     """run_main should handle YapfError and sys.exit(1)."""
  92     expected_message = 'yapf: input filenames did not match any python files\n'
  93     sys.argv = ['yapf', 'foo.c']
  94     with captured_output() as (out, err):
  95       with self.assertRaises(SystemExit):
  96         yapf.run_main()
  97       self.assertEqual(out.getvalue(), '')
  98       self.assertEqual(err.getvalue(), expected_message)
  99
 100
 101 class MainTest(yapf_test_helper.YAPFTest):
 102
 103   def testNoPythonFilesMatched(self):
 104     with self.assertRaisesRegex(yapf.errors.YapfError,
 105                                 'did not match any python files'):
 106       yapf.main(['yapf', 'foo.c'])
 107
 108   def testEchoInput(self):
 109     code = 'a = 1\nb = 2\n'
 110     with patched_input(code):
 111       with captured_output() as (out, _):
 112         ret = yapf.main([])
 113         self.assertEqual(ret, 0)
 114         self.assertEqual(out.getvalue(), code)
 115
 116   def testEchoInputWithStyle(self):
 117     code = 'def f(a = 1\n\n):\n    return 2*a\n'
 118     yapf_code = 'def f(a=1):\n  return 2 * a\n'
 119     with patched_input(code):
 120       with captured_output() as (out, _):
 121         ret = yapf.main(['-', '--style=yapf'])
 122         self.assertEqual(ret, 0)
 123         self.assertEqual(out.getvalue(), yapf_code)
 124
 125   def testEchoBadInput(self):
 126     bad_syntax = '  a = 1\n'
 127     with patched_input(bad_syntax):
 128       with captured_output() as (_, _):
 129         with self.assertRaisesRegex(yapf.errors.YapfError, 'unexpected indent'):
 130           yapf.main([])
 131
 132   def testHelp(self):
 133     with captured_output() as (out, _):
 134       ret = yapf.main(['-', '--style-help', '--style=pep8'])
 135       self.assertEqual(ret, 0)
 136       help_message = out.getvalue()
 137       self.assertIn('indent_width=4', help_message)
 138       self.assertIn('The number of spaces required before a trailing comment.',
 139                     help_message)