Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_trace.py @ 87690:66c1c9f32567 default tip

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Add use_weakref option to functools.lru_cache The use_weakref option makes lru_cache create weak references to the function arguments when creating the cache key, which prevents them from staying in the memory forever even after all other references to them are gone. This is a proof of concept for http://bugs.python.org/issue19859
author Radomir Dopieralski <devel@sheep.art.pl>
date Tue, 03 Dec 2013 16:02:48 +0100
parents 662f97427acf
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 import os
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3f8b5fcbf07e #17143: fix a missing import in the trace module. Initial patch by Berker Peksag.
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2 import io
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3 import sys
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4 from test.support import (run_unittest, TESTFN, rmtree, unlink,
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5 captured_stdout)
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6 import unittest
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7
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8 import trace
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9 from trace import CoverageResults, Trace
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10
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11 from test.tracedmodules import testmod
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13
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14 #------------------------------- Utilities -----------------------------------#
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15
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16 def fix_ext_py(filename):
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17 """Given a .pyc/.pyo filename converts it to the appropriate .py"""
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18 if filename.endswith(('.pyc', '.pyo')):
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19 filename = filename[:-1]
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20 return filename
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21
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22 def my_file_and_modname():
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23 """The .py file and module name of this file (__file__)"""
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24 modname = os.path.splitext(os.path.basename(__file__))[0]
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25 return fix_ext_py(__file__), modname
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26
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27 def get_firstlineno(func):
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28 return func.__code__.co_firstlineno
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29
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30 #-------------------- Target functions for tracing ---------------------------#
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31 #
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32 # The relative line numbers of lines in these functions matter for verifying
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33 # tracing. Please modify the appropriate tests if you change one of the
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34 # functions. Absolute line numbers don't matter.
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35 #
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36
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37 def traced_func_linear(x, y):
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38 a = x
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39 b = y
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40 c = a + b
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41 return c
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42
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43 def traced_func_loop(x, y):
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44 c = x
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45 for i in range(5):
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46 c += y
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47 return c
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48
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49 def traced_func_importing(x, y):
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50 return x + y + testmod.func(1)
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51
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52 def traced_func_simple_caller(x):
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53 c = traced_func_linear(x, x)
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54 return c + x
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55
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56 def traced_func_importing_caller(x):
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57 k = traced_func_simple_caller(x)
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58 k += traced_func_importing(k, x)
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59 return k
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60
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61 def traced_func_generator(num):
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62 c = 5 # executed once
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63 for i in range(num):
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64 yield i + c
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65
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66 def traced_func_calling_generator():
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67 k = 0
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68 for i in traced_func_generator(10):
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69 k += i
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70
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71 def traced_doubler(num):
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72 return num * 2
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73
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74 def traced_caller_list_comprehension():
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75 k = 10
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76 mylist = [traced_doubler(i) for i in range(k)]
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77 return mylist
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78
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79
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80 class TracedClass(object):
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81 def __init__(self, x):
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82 self.a = x
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83
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84 def inst_method_linear(self, y):
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85 return self.a + y
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86
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87 def inst_method_calling(self, x):
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88 c = self.inst_method_linear(x)
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89 return c + traced_func_linear(x, c)
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90
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91 @classmethod
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92 def class_method_linear(cls, y):
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93 return y * 2
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94
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95 @staticmethod
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96 def static_method_linear(y):
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97 return y * 2
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98
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99
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100 #------------------------------ Test cases -----------------------------------#
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101
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102
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103 class TestLineCounts(unittest.TestCase):
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104 """White-box testing of line-counting, via runfunc"""
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105 def setUp(self):
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106 self.addCleanup(sys.settrace, sys.gettrace())
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107 self.tracer = Trace(count=1, trace=0, countfuncs=0, countcallers=0)
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108 self.my_py_filename = fix_ext_py(__file__)
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109
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110 def test_traced_func_linear(self):
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111 result = self.tracer.runfunc(traced_func_linear, 2, 5)
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112 self.assertEqual(result, 7)
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113
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114 # all lines are executed once
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115 expected = {}
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116 firstlineno = get_firstlineno(traced_func_linear)
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117 for i in range(1, 5):
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118 expected[(self.my_py_filename, firstlineno + i)] = 1
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119
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120 self.assertEqual(self.tracer.results().counts, expected)
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121
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122 def test_traced_func_loop(self):
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123 self.tracer.runfunc(traced_func_loop, 2, 3)
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124
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125 firstlineno = get_firstlineno(traced_func_loop)
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126 expected = {
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127 (self.my_py_filename, firstlineno + 1): 1,
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128 (self.my_py_filename, firstlineno + 2): 6,
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129 (self.my_py_filename, firstlineno + 3): 5,
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130 (self.my_py_filename, firstlineno + 4): 1,
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131 }
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132 self.assertEqual(self.tracer.results().counts, expected)
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133
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134 def test_traced_func_importing(self):
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135 self.tracer.runfunc(traced_func_importing, 2, 5)
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136
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137 firstlineno = get_firstlineno(traced_func_importing)
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138 expected = {
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139 (self.my_py_filename, firstlineno + 1): 1,
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140 (fix_ext_py(testmod.__file__), 2): 1,
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141 (fix_ext_py(testmod.__file__), 3): 1,
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142 }
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143
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144 self.assertEqual(self.tracer.results().counts, expected)
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145
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146 def test_trace_func_generator(self):
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147 self.tracer.runfunc(traced_func_calling_generator)
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148
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149 firstlineno_calling = get_firstlineno(traced_func_calling_generator)
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150 firstlineno_gen = get_firstlineno(traced_func_generator)
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151 expected = {
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152 (self.my_py_filename, firstlineno_calling + 1): 1,
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153 (self.my_py_filename, firstlineno_calling + 2): 11,
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154 (self.my_py_filename, firstlineno_calling + 3): 10,
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155 (self.my_py_filename, firstlineno_gen + 1): 1,
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156 (self.my_py_filename, firstlineno_gen + 2): 11,
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157 (self.my_py_filename, firstlineno_gen + 3): 10,
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158 }
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159 self.assertEqual(self.tracer.results().counts, expected)
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160
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161 def test_trace_list_comprehension(self):
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162 self.tracer.runfunc(traced_caller_list_comprehension)
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163
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164 firstlineno_calling = get_firstlineno(traced_caller_list_comprehension)
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165 firstlineno_called = get_firstlineno(traced_doubler)
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166 expected = {
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167 (self.my_py_filename, firstlineno_calling + 1): 1,
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168 # List compehentions work differently in 3.x, so the count
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169 # below changed compared to 2.x.
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170 (self.my_py_filename, firstlineno_calling + 2): 12,
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171 (self.my_py_filename, firstlineno_calling + 3): 1,
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172 (self.my_py_filename, firstlineno_called + 1): 10,
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173 }
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174 self.assertEqual(self.tracer.results().counts, expected)
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175
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176
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177 def test_linear_methods(self):
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178 # XXX todo: later add 'static_method_linear' and 'class_method_linear'
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179 # here, once issue1764286 is resolved
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180 #
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181 for methname in ['inst_method_linear',]:
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182 tracer = Trace(count=1, trace=0, countfuncs=0, countcallers=0)
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183 traced_obj = TracedClass(25)
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184 method = getattr(traced_obj, methname)
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185 tracer.runfunc(method, 20)
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186
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187 firstlineno = get_firstlineno(method)
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188 expected = {
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189 (self.my_py_filename, firstlineno + 1): 1,
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190 }
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191 self.assertEqual(tracer.results().counts, expected)
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192
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193 class TestRunExecCounts(unittest.TestCase):
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194 """A simple sanity test of line-counting, via runctx (exec)"""
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195 def setUp(self):
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196 self.my_py_filename = fix_ext_py(__file__)
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197 self.addCleanup(sys.settrace, sys.gettrace())
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198
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199 def test_exec_counts(self):
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200 self.tracer = Trace(count=1, trace=0, countfuncs=0, countcallers=0)
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201 code = r'''traced_func_loop(2, 5)'''
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202 code = compile(code, __file__, 'exec')
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203 self.tracer.runctx(code, globals(), vars())
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204
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205 firstlineno = get_firstlineno(traced_func_loop)
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206 expected = {
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207 (self.my_py_filename, firstlineno + 1): 1,
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208 (self.my_py_filename, firstlineno + 2): 6,
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209 (self.my_py_filename, firstlineno + 3): 5,
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210 (self.my_py_filename, firstlineno + 4): 1,
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211 }
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212
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213 # When used through 'run', some other spurious counts are produced, like
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214 # the settrace of threading, which we ignore, just making sure that the
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215 # counts fo traced_func_loop were right.
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216 #
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217 for k in expected.keys():
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218 self.assertEqual(self.tracer.results().counts[k], expected[k])
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219
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220
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221 class TestFuncs(unittest.TestCase):
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222 """White-box testing of funcs tracing"""
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223 def setUp(self):
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224 self.addCleanup(sys.settrace, sys.gettrace())
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225 self.tracer = Trace(count=0, trace=0, countfuncs=1)
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226 self.filemod = my_file_and_modname()
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227
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228 def test_simple_caller(self):
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229 self.tracer.runfunc(traced_func_simple_caller, 1)
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230
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231 expected = {
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232 self.filemod + ('traced_func_simple_caller',): 1,
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233 self.filemod + ('traced_func_linear',): 1,
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234 }
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235 self.assertEqual(self.tracer.results().calledfuncs, expected)
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236
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237 def test_loop_caller_importing(self):
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238 self.tracer.runfunc(traced_func_importing_caller, 1)
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239
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240 expected = {
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241 self.filemod + ('traced_func_simple_caller',): 1,
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242 self.filemod + ('traced_func_linear',): 1,
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243 self.filemod + ('traced_func_importing_caller',): 1,
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244 self.filemod + ('traced_func_importing',): 1,
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245 (fix_ext_py(testmod.__file__), 'testmod', 'func'): 1,
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246 }
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247 self.assertEqual(self.tracer.results().calledfuncs, expected)
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248
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249 @unittest.skipIf(hasattr(sys, 'gettrace') and sys.gettrace(),
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250 'pre-existing trace function throws off measurements')
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251 def test_inst_method_calling(self):
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252 obj = TracedClass(20)
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253 self.tracer.runfunc(obj.inst_method_calling, 1)
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254
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255 expected = {
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256 self.filemod + ('TracedClass.inst_method_calling',): 1,
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257 self.filemod + ('TracedClass.inst_method_linear',): 1,
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258 self.filemod + ('traced_func_linear',): 1,
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259 }
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260 self.assertEqual(self.tracer.results().calledfuncs, expected)
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261
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262
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263 class TestCallers(unittest.TestCase):
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264 """White-box testing of callers tracing"""
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265 def setUp(self):
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266 self.addCleanup(sys.settrace, sys.gettrace())
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267 self.tracer = Trace(count=0, trace=0, countcallers=1)
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268 self.filemod = my_file_and_modname()
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269
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270 @unittest.skipIf(hasattr(sys, 'gettrace') and sys.gettrace(),
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271 'pre-existing trace function throws off measurements')
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272 def test_loop_caller_importing(self):
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273 self.tracer.runfunc(traced_func_importing_caller, 1)
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274
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275 expected = {
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276 ((os.path.splitext(trace.__file__)[0] + '.py', 'trace', 'Trace.runfunc'),
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277 (self.filemod + ('traced_func_importing_caller',))): 1,
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278 ((self.filemod + ('traced_func_simple_caller',)),
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279 (self.filemod + ('traced_func_linear',))): 1,
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280 ((self.filemod + ('traced_func_importing_caller',)),
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281 (self.filemod + ('traced_func_simple_caller',))): 1,
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282 ((self.filemod + ('traced_func_importing_caller',)),
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283 (self.filemod + ('traced_func_importing',))): 1,
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284 ((self.filemod + ('traced_func_importing',)),
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285 (fix_ext_py(testmod.__file__), 'testmod', 'func')): 1,
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286 }
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287 self.assertEqual(self.tracer.results().callers, expected)
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288
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289
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290 # Created separately for issue #3821
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291 class TestCoverage(unittest.TestCase):
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292 def setUp(self):
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293 self.addCleanup(sys.settrace, sys.gettrace())
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294
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295 def tearDown(self):
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296 rmtree(TESTFN)
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297 unlink(TESTFN)
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298
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299 def _coverage(self, tracer,
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300 cmd='from test import test_pprint; test_pprint.test_main()'):
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301 tracer.run(cmd)
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302 r = tracer.results()
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303 r.write_results(show_missing=True, summary=True, coverdir=TESTFN)
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304
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305 def test_coverage(self):
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306 tracer = trace.Trace(trace=0, count=1)
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307 with captured_stdout() as stdout:
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308 self._coverage(tracer)
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309 stdout = stdout.getvalue()
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310 self.assertTrue("pprint.py" in stdout)
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311 self.assertTrue("case.py" in stdout) # from unittest
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312 files = os.listdir(TESTFN)
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313 self.assertTrue("pprint.cover" in files)
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314 self.assertTrue("unittest.case.cover" in files)
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315
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316 def test_coverage_ignore(self):
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317 # Ignore all files, nothing should be traced nor printed
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318 libpath = os.path.normpath(os.path.dirname(os.__file__))
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319 # sys.prefix does not work when running from a checkout
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320 tracer = trace.Trace(ignoredirs=[sys.base_prefix, sys.base_exec_prefix,
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321 libpath], trace=0, count=1)
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322 with captured_stdout() as stdout:
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323 self._coverage(tracer)
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324 if os.path.exists(TESTFN):
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325 files = os.listdir(TESTFN)
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326 self.assertEqual(files, ['_importlib.cover']) # Ignore __import__
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327
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328 def test_issue9936(self):
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329 tracer = trace.Trace(trace=0, count=1)
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330 modname = 'test.tracedmodules.testmod'
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331 # Ensure that the module is executed in import
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332 if modname in sys.modules:
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333 del sys.modules[modname]
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334 cmd = ("import test.tracedmodules.testmod as t;"
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335 "t.func(0); t.func2();")
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336 with captured_stdout() as stdout:
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337 self._coverage(tracer, cmd)
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338 stdout.seek(0)
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339 stdout.readline()
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340 coverage = {}
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341 for line in stdout:
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342 lines, cov, module = line.split()[:3]
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343 coverage[module] = (int(lines), int(cov[:-1]))
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344 # XXX This is needed to run regrtest.py as a script
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345 modname = trace._fullmodname(sys.modules[modname].__file__)
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346 self.assertIn(modname, coverage)
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347 self.assertEqual(coverage[modname], (5, 100))
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348
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349 ### Tests that don't mess with sys.settrace and can be traced
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350 ### themselves TODO: Skip tests that do mess with sys.settrace when
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351 ### regrtest is invoked with -T option.
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352 class Test_Ignore(unittest.TestCase):
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353 def test_ignored(self):
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354 jn = os.path.join
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355 ignore = trace._Ignore(['x', 'y.z'], [jn('foo', 'bar')])
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356 self.assertTrue(ignore.names('x.py', 'x'))
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357 self.assertFalse(ignore.names('xy.py', 'xy'))
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358 self.assertFalse(ignore.names('y.py', 'y'))
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359 self.assertTrue(ignore.names(jn('foo', 'bar', 'baz.py'), 'baz'))
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360 self.assertFalse(ignore.names(jn('bar', 'z.py'), 'z'))
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361 # Matched before.
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362 self.assertTrue(ignore.names(jn('bar', 'baz.py'), 'baz'))
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363
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364
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365 class TestDeprecatedMethods(unittest.TestCase):
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366
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367 def test_deprecated_usage(self):
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368 sio = io.StringIO()
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369 with self.assertWarns(DeprecationWarning):
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370 trace.usage(sio)
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371 self.assertIn('Usage:', sio.getvalue())
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372
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373 def test_deprecated_Ignore(self):
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374 with self.assertWarns(DeprecationWarning):
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375 trace.Ignore()
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376
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377 def test_deprecated_modname(self):
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378 with self.assertWarns(DeprecationWarning):
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379 self.assertEqual("spam", trace.modname("spam"))
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380
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381 def test_deprecated_fullmodname(self):
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382 with self.assertWarns(DeprecationWarning):
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383 self.assertEqual("spam", trace.fullmodname("spam"))
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384
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385 def test_deprecated_find_lines_from_code(self):
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386 with self.assertWarns(DeprecationWarning):
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387 def foo():
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388 pass
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389 trace.find_lines_from_code(foo.__code__, ["eggs"])
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390
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391 def test_deprecated_find_lines(self):
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392 with self.assertWarns(DeprecationWarning):
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393 def foo():
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394 pass
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395 trace.find_lines(foo.__code__, ["eggs"])
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396
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397 def test_deprecated_find_strings(self):
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398 with open(TESTFN, 'w') as fd:
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399 self.addCleanup(unlink, TESTFN)
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400 with self.assertWarns(DeprecationWarning):
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401 trace.find_strings(fd.name)
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402
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403 def test_deprecated_find_executable_linenos(self):
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404 with open(TESTFN, 'w') as fd:
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405 self.addCleanup(unlink, TESTFN)
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406 with self.assertWarns(DeprecationWarning):
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407 trace.find_executable_linenos(fd.name)
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408
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409
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410 def test_main():
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411 run_unittest(__name__)
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412
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413
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414 if __name__ == '__main__':
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415 test_main()