Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/future/tests/base.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
parents d30785e31577
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 from __future__ import print_function, absolute_import
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2 import os
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3 import tempfile
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4 import unittest
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5 import sys
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6 import re
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7 import warnings
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8 import io
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9 from textwrap import dedent
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10
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11 from future.utils import bind_method, PY26, PY3, PY2, PY27
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12 from future.moves.subprocess import check_output, STDOUT, CalledProcessError
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13
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14 if PY26:
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15 import unittest2 as unittest
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16
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17
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18 def reformat_code(code):
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19 """
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20 Removes any leading \n and dedents.
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21 """
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22 if code.startswith('\n'):
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23 code = code[1:]
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24 return dedent(code)
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25
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26
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27 def order_future_lines(code):
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28 """
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29 Returns the code block with any ``__future__`` import lines sorted, and
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30 then any ``future`` import lines sorted, then any ``builtins`` import lines
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31 sorted.
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32
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33 This only sorts the lines within the expected blocks.
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34
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35 See test_order_future_lines() for an example.
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36 """
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37
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38 # We need .splitlines(keepends=True), which doesn't exist on Py2,
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39 # so we use this instead:
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40 lines = code.split('\n')
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41
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42 uufuture_line_numbers = [i for i, line in enumerate(lines)
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43 if line.startswith('from __future__ import ')]
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44
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45 future_line_numbers = [i for i, line in enumerate(lines)
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46 if line.startswith('from future')
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47 or line.startswith('from past')]
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48
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49 builtins_line_numbers = [i for i, line in enumerate(lines)
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50 if line.startswith('from builtins')]
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51
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52 assert code.lstrip() == code, ('internal usage error: '
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53 'dedent the code before calling order_future_lines()')
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54
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55 def mymax(numbers):
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56 return max(numbers) if len(numbers) > 0 else 0
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57
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58 def mymin(numbers):
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59 return min(numbers) if len(numbers) > 0 else float('inf')
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60
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61 assert mymax(uufuture_line_numbers) <= mymin(future_line_numbers), \
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62 'the __future__ and future imports are out of order'
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63
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64 # assert mymax(future_line_numbers) <= mymin(builtins_line_numbers), \
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65 # 'the future and builtins imports are out of order'
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66
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67 uul = sorted([lines[i] for i in uufuture_line_numbers])
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68 sorted_uufuture_lines = dict(zip(uufuture_line_numbers, uul))
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69
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70 fl = sorted([lines[i] for i in future_line_numbers])
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71 sorted_future_lines = dict(zip(future_line_numbers, fl))
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72
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73 bl = sorted([lines[i] for i in builtins_line_numbers])
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74 sorted_builtins_lines = dict(zip(builtins_line_numbers, bl))
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75
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76 # Replace the old unsorted "from __future__ import ..." lines with the
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77 # new sorted ones:
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78 new_lines = []
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79 for i in range(len(lines)):
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80 if i in uufuture_line_numbers:
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81 new_lines.append(sorted_uufuture_lines[i])
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82 elif i in future_line_numbers:
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83 new_lines.append(sorted_future_lines[i])
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84 elif i in builtins_line_numbers:
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85 new_lines.append(sorted_builtins_lines[i])
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86 else:
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87 new_lines.append(lines[i])
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88 return '\n'.join(new_lines)
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89
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90
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91 class VerboseCalledProcessError(CalledProcessError):
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92 """
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93 Like CalledProcessError, but it displays more information (message and
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94 script output) for diagnosing test failures etc.
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95 """
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96 def __init__(self, msg, returncode, cmd, output=None):
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97 self.msg = msg
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98 self.returncode = returncode
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99 self.cmd = cmd
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100 self.output = output
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101
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102 def __str__(self):
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103 return ("Command '%s' failed with exit status %d\nMessage: %s\nOutput: %s"
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104 % (self.cmd, self.returncode, self.msg, self.output))
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105
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106 class FuturizeError(VerboseCalledProcessError):
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107 pass
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108
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109 class PasteurizeError(VerboseCalledProcessError):
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110 pass
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111
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112
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113 class CodeHandler(unittest.TestCase):
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114 """
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115 Handy mixin for test classes for writing / reading / futurizing /
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116 running .py files in the test suite.
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117 """
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118 def setUp(self):
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119 """
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120 The outputs from the various futurize stages should have the
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121 following headers:
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122 """
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123 # After stage1:
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124 # TODO: use this form after implementing a fixer to consolidate
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125 # __future__ imports into a single line:
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126 # self.headers1 = """
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127 # from __future__ import absolute_import, division, print_function
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128 # """
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129 self.headers1 = reformat_code("""
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130 from __future__ import absolute_import
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131 from __future__ import division
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132 from __future__ import print_function
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133 """)
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134
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135 # After stage2 --all-imports:
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136 # TODO: use this form after implementing a fixer to consolidate
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137 # __future__ imports into a single line:
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138 # self.headers2 = """
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139 # from __future__ import (absolute_import, division,
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140 # print_function, unicode_literals)
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141 # from future import standard_library
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142 # from future.builtins import *
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143 # """
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144 self.headers2 = reformat_code("""
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145 from __future__ import absolute_import
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146 from __future__ import division
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147 from __future__ import print_function
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148 from __future__ import unicode_literals
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149 from future import standard_library
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150 standard_library.install_aliases()
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151 from builtins import *
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152 """)
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153 self.interpreters = [sys.executable]
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154 self.tempdir = tempfile.mkdtemp() + os.path.sep
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155 pypath = os.getenv('PYTHONPATH')
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156 if pypath:
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157 self.env = {'PYTHONPATH': os.getcwd() + os.pathsep + pypath}
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158 else:
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159 self.env = {'PYTHONPATH': os.getcwd()}
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160
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161 def convert(self, code, stages=(1, 2), all_imports=False, from3=False,
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162 reformat=True, run=True, conservative=False):
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163 """
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164 Converts the code block using ``futurize`` and returns the
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165 resulting code.
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166
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167 Passing stages=[1] or stages=[2] passes the flag ``--stage1`` or
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168 ``stage2`` to ``futurize``. Passing both stages runs ``futurize``
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169 with both stages by default.
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170
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171 If from3 is False, runs ``futurize``, converting from Python 2 to
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172 both 2 and 3. If from3 is True, runs ``pasteurize`` to convert
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173 from Python 3 to both 2 and 3.
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174
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175 Optionally reformats the code block first using the reformat() function.
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176
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177 If run is True, runs the resulting code under all Python
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178 interpreters in self.interpreters.
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179 """
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180 if reformat:
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181 code = reformat_code(code)
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182 self._write_test_script(code)
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183 self._futurize_test_script(stages=stages, all_imports=all_imports,
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184 from3=from3, conservative=conservative)
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185 output = self._read_test_script()
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186 if run:
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187 for interpreter in self.interpreters:
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188 _ = self._run_test_script(interpreter=interpreter)
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189 return output
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190
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191 def compare(self, output, expected, ignore_imports=True):
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192 """
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193 Compares whether the code blocks are equal. If not, raises an
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194 exception so the test fails. Ignores any trailing whitespace like
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195 blank lines.
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196
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197 If ignore_imports is True, passes the code blocks into the
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198 strip_future_imports method.
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199
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200 If one code block is a unicode string and the other a
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201 byte-string, it assumes the byte-string is encoded as utf-8.
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202 """
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203 if ignore_imports:
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204 output = self.strip_future_imports(output)
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205 expected = self.strip_future_imports(expected)
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206 if isinstance(output, bytes) and not isinstance(expected, bytes):
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207 output = output.decode('utf-8')
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208 if isinstance(expected, bytes) and not isinstance(output, bytes):
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209 expected = expected.decode('utf-8')
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210 self.assertEqual(order_future_lines(output.rstrip()),
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211 expected.rstrip())
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212
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213 def strip_future_imports(self, code):
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214 """
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215 Strips any of these import lines:
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216
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217 from __future__ import <anything>
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218 from future <anything>
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219 from future.<anything>
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220 from builtins <anything>
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221
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222 or any line containing:
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223 install_hooks()
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224 or:
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225 install_aliases()
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226
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227 Limitation: doesn't handle imports split across multiple lines like
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228 this:
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229
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230 from __future__ import (absolute_import, division, print_function,
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231 unicode_literals)
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232 """
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233 output = []
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234 # We need .splitlines(keepends=True), which doesn't exist on Py2,
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235 # so we use this instead:
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236 for line in code.split('\n'):
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237 if not (line.startswith('from __future__ import ')
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238 or line.startswith('from future ')
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239 or line.startswith('from builtins ')
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240 or 'install_hooks()' in line
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241 or 'install_aliases()' in line
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242 # but don't match "from future_builtins" :)
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243 or line.startswith('from future.')):
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244 output.append(line)
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245 return '\n'.join(output)
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246
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247 def convert_check(self, before, expected, stages=(1, 2), all_imports=False,
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248 ignore_imports=True, from3=False, run=True,
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249 conservative=False):
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250 """
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251 Convenience method that calls convert() and compare().
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252
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253 Reformats the code blocks automatically using the reformat_code()
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254 function.
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255
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256 If all_imports is passed, we add the appropriate import headers
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257 for the stage(s) selected to the ``expected`` code-block, so they
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258 needn't appear repeatedly in the test code.
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259
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260 If ignore_imports is True, ignores the presence of any lines
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261 beginning:
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262
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263 from __future__ import ...
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264 from future import ...
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265
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266 for the purpose of the comparison.
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267 """
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268 output = self.convert(before, stages=stages, all_imports=all_imports,
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269 from3=from3, run=run, conservative=conservative)
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270 if all_imports:
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271 headers = self.headers2 if 2 in stages else self.headers1
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272 else:
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273 headers = ''
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274
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275 reformatted = reformat_code(expected)
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276 if headers in reformatted:
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277 headers = ''
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278
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279 self.compare(output, headers + reformatted,
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280 ignore_imports=ignore_imports)
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281
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282 def unchanged(self, code, **kwargs):
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283 """
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284 Convenience method to ensure the code is unchanged by the
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285 futurize process.
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286 """
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287 self.convert_check(code, code, **kwargs)
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288
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289 def _write_test_script(self, code, filename='mytestscript.py'):
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290 """
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291 Dedents the given code (a multiline string) and writes it out to
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292 a file in a temporary folder like /tmp/tmpUDCn7x/mytestscript.py.
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293 """
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294 if isinstance(code, bytes):
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295 code = code.decode('utf-8')
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296 # Be explicit about encoding the temp file as UTF-8 (issue #63):
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297 with io.open(self.tempdir + filename, 'wt', encoding='utf-8') as f:
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298 f.write(dedent(code))
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299
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300 def _read_test_script(self, filename='mytestscript.py'):
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301 with io.open(self.tempdir + filename, 'rt', encoding='utf-8') as f:
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302 newsource = f.read()
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303 return newsource
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304
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305 def _futurize_test_script(self, filename='mytestscript.py', stages=(1, 2),
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306 all_imports=False, from3=False,
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307 conservative=False):
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308 params = []
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309 stages = list(stages)
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310 if all_imports:
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311 params.append('--all-imports')
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312 if from3:
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313 script = 'pasteurize.py'
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314 else:
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315 script = 'futurize.py'
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316 if stages == [1]:
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317 params.append('--stage1')
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318 elif stages == [2]:
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319 params.append('--stage2')
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320 else:
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321 assert stages == [1, 2]
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322 if conservative:
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323 params.append('--conservative')
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324 # No extra params needed
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325
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326 # Absolute file path:
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327 fn = self.tempdir + filename
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328 call_args = [sys.executable, script] + params + ['-w', fn]
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329 try:
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330 output = check_output(call_args, stderr=STDOUT, env=self.env)
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331 except CalledProcessError as e:
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332 with open(fn) as f:
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333 msg = (
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334 'Error running the command %s\n'
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335 '%s\n'
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336 'Contents of file %s:\n'
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337 '\n'
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338 '%s') % (
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339 ' '.join(call_args),
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340 'env=%s' % self.env,
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341 fn,
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342 '----\n%s\n----' % f.read(),
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343 )
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344 ErrorClass = (FuturizeError if 'futurize' in script else PasteurizeError)
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345
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346 if not hasattr(e, 'output'):
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347 # The attribute CalledProcessError.output doesn't exist on Py2.6
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348 e.output = None
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349 raise ErrorClass(msg, e.returncode, e.cmd, output=e.output)
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350 return output
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351
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352 def _run_test_script(self, filename='mytestscript.py',
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353 interpreter=sys.executable):
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354 # Absolute file path:
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355 fn = self.tempdir + filename
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356 try:
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357 output = check_output([interpreter, fn],
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358 env=self.env, stderr=STDOUT)
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359 except CalledProcessError as e:
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360 with open(fn) as f:
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361 msg = (
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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362 'Error running the command %s\n'
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363 '%s\n'
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364 'Contents of file %s:\n'
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365 '\n'
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366 '%s') % (
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367 ' '.join([interpreter, fn]),
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368 'env=%s' % self.env,
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369 fn,
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370 '----\n%s\n----' % f.read(),
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371 )
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372 if not hasattr(e, 'output'):
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373 # The attribute CalledProcessError.output doesn't exist on Py2.6
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374 e.output = None
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375 raise VerboseCalledProcessError(msg, e.returncode, e.cmd, output=e.output)
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376 return output
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377
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378
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379 # Decorator to skip some tests on Python 2.6 ...
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380 skip26 = unittest.skipIf(PY26, "this test is known to fail on Py2.6")
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381
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382
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383 def expectedFailurePY3(func):
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384 if not PY3:
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385 return func
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386 return unittest.expectedFailure(func)
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387
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388 def expectedFailurePY26(func):
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389 if not PY26:
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390 return func
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391 return unittest.expectedFailure(func)
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392
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393
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394 def expectedFailurePY27(func):
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395 if not PY27:
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396 return func
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397 return unittest.expectedFailure(func)
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398
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399
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400 def expectedFailurePY2(func):
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401 if not PY2:
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402 return func
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403 return unittest.expectedFailure(func)
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404
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405
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406 # Renamed in Py3.3:
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407 if not hasattr(unittest.TestCase, 'assertRaisesRegex'):
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408 unittest.TestCase.assertRaisesRegex = unittest.TestCase.assertRaisesRegexp
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409
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410 # From Py3.3:
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411 def assertRegex(self, text, expected_regex, msg=None):
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412 """Fail the test unless the text matches the regular expression."""
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413 if isinstance(expected_regex, (str, unicode)):
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414 assert expected_regex, "expected_regex must not be empty."
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415 expected_regex = re.compile(expected_regex)
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416 if not expected_regex.search(text):
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417 msg = msg or "Regex didn't match"
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418 msg = '%s: %r not found in %r' % (msg, expected_regex.pattern, text)
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419 raise self.failureException(msg)
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420
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421 if not hasattr(unittest.TestCase, 'assertRegex'):
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422 bind_method(unittest.TestCase, 'assertRegex', assertRegex)
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423
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424 class _AssertRaisesBaseContext(object):
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425
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426 def __init__(self, expected, test_case, callable_obj=None,
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427 expected_regex=None):
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428 self.expected = expected
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429 self.test_case = test_case
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430 if callable_obj is not None:
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431 try:
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432 self.obj_name = callable_obj.__name__
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433 except AttributeError:
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434 self.obj_name = str(callable_obj)
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435 else:
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436 self.obj_name = None
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437 if isinstance(expected_regex, (bytes, str)):
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438 expected_regex = re.compile(expected_regex)
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439 self.expected_regex = expected_regex
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440 self.msg = None
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441
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442 def _raiseFailure(self, standardMsg):
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443 msg = self.test_case._formatMessage(self.msg, standardMsg)
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444 raise self.test_case.failureException(msg)
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445
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446 def handle(self, name, callable_obj, args, kwargs):
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447 """
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448 If callable_obj is None, assertRaises/Warns is being used as a
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449 context manager, so check for a 'msg' kwarg and return self.
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450 If callable_obj is not None, call it passing args and kwargs.
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451 """
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452 if callable_obj is None:
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453 self.msg = kwargs.pop('msg', None)
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454 return self
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455 with self:
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456 callable_obj(*args, **kwargs)
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457
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458 class _AssertWarnsContext(_AssertRaisesBaseContext):
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459 """A context manager used to implement TestCase.assertWarns* methods."""
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460
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461 def __enter__(self):
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462 # The __warningregistry__'s need to be in a pristine state for tests
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463 # to work properly.
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464 for v in sys.modules.values():
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465 if getattr(v, '__warningregistry__', None):
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466 v.__warningregistry__ = {}
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467 self.warnings_manager = warnings.catch_warnings(record=True)
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468 self.warnings = self.warnings_manager.__enter__()
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469 warnings.simplefilter("always", self.expected)
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470 return self
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471
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472 def __exit__(self, exc_type, exc_value, tb):
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473 self.warnings_manager.__exit__(exc_type, exc_value, tb)
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474 if exc_type is not None:
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475 # let unexpected exceptions pass through
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476 return
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477 try:
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478 exc_name = self.expected.__name__
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479 except AttributeError:
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480 exc_name = str(self.expected)
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481 first_matching = None
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482 for m in self.warnings:
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483 w = m.message
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484 if not isinstance(w, self.expected):
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485 continue
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486 if first_matching is None:
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487 first_matching = w
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488 if (self.expected_regex is not None and
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489 not self.expected_regex.search(str(w))):
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490 continue
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491 # store warning for later retrieval
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492 self.warning = w
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493 self.filename = m.filename
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494 self.lineno = m.lineno
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495 return
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496 # Now we simply try to choose a helpful failure message
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497 if first_matching is not None:
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498 self._raiseFailure('"{}" does not match "{}"'.format(
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499 self.expected_regex.pattern, str(first_matching)))
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500 if self.obj_name:
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501 self._raiseFailure("{} not triggered by {}".format(exc_name,
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502 self.obj_name))
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503 else:
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504 self._raiseFailure("{} not triggered".format(exc_name))
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505
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506
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507 def assertWarns(self, expected_warning, callable_obj=None, *args, **kwargs):
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508 """Fail unless a warning of class warnClass is triggered
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509 by callable_obj when invoked with arguments args and keyword
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510 arguments kwargs. If a different type of warning is
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511 triggered, it will not be handled: depending on the other
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512 warning filtering rules in effect, it might be silenced, printed
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513 out, or raised as an exception.
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514
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515 If called with callable_obj omitted or None, will return a
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516 context object used like this::
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517
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518 with self.assertWarns(SomeWarning):
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519 do_something()
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520
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521 An optional keyword argument 'msg' can be provided when assertWarns
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522 is used as a context object.
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523
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524 The context manager keeps a reference to the first matching
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525 warning as the 'warning' attribute; similarly, the 'filename'
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526 and 'lineno' attributes give you information about the line
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527 of Python code from which the warning was triggered.
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528 This allows you to inspect the warning after the assertion::
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529
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530 with self.assertWarns(SomeWarning) as cm:
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531 do_something()
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532 the_warning = cm.warning
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533 self.assertEqual(the_warning.some_attribute, 147)
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534 """
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535 context = _AssertWarnsContext(expected_warning, self, callable_obj)
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536 return context.handle('assertWarns', callable_obj, args, kwargs)
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537
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538 if not hasattr(unittest.TestCase, 'assertWarns'):
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539 bind_method(unittest.TestCase, 'assertWarns', assertWarns)