mirror of https://github.com/python/cpython
69 lines
2.4 KiB
Python
69 lines
2.4 KiB
Python
# Automatic Python regression test.
|
|
#
|
|
# Some essential parts of the Python interpreter are tested by the module
|
|
# 'testall'. (Despite its name, it doesn't test everything -- that would
|
|
# be a truly Herculean task!) When a test fails, 'testall' raises an
|
|
# exception. When all tests succeed, it produces quite a lot of output.
|
|
#
|
|
# For a normal regression test, this output is never looked at unless
|
|
# something goes wrong. Thus, it would be wise to suppress the output
|
|
# normally. This module does that, but it doesn't just throw the output
|
|
# from 'testall' away -- it compares it with the output from a previous
|
|
# run. If a difference is noticed it raises an exception; if all is well,
|
|
# it prints nothing except 'All tests OK.' at the very end.
|
|
#
|
|
# The output from a previous run is supposed to be in a file 'testall.out'
|
|
# somewhere on the search path for modules (sys.path, initialized from
|
|
# $PYTHONPATH plus some default places).
|
|
#
|
|
# Of course, if the normal output of the tests is changed because the
|
|
# tests have been changed (rather than a test producing the wrong output),
|
|
# 'autotest' will fail as well. In this case, run 'testall' manually
|
|
# and direct its output to 'testall.out'.
|
|
#
|
|
# The comparison uses (and demonstrates!) a rather new Python feature:
|
|
# program output that normally goes to stdout (by 'print' statements
|
|
# or by writing directly to sys.stdout) can be redirected to an
|
|
# arbitrary class instance as long as it has a 'write' method.
|
|
|
|
import os
|
|
import sys
|
|
|
|
# Function to find a file somewhere on sys.path
|
|
def findfile(filename):
|
|
for dirname in sys.path:
|
|
fullname = os.path.join(dirname, filename)
|
|
if os.path.exists(fullname):
|
|
return fullname
|
|
return filename # Will cause exception later
|
|
|
|
# Exception raised when the test failed (not the same as in test_support)
|
|
TestFailed = 'autotest.TestFailed'
|
|
|
|
# Class substituted for sys.stdout, to compare it with the given file
|
|
class Compare:
|
|
def init(self, filename):
|
|
self.fp = open(filename, 'r')
|
|
return self
|
|
def write(self, data):
|
|
expected = self.fp.read(len(data))
|
|
if data <> expected:
|
|
raise TestFailed, \
|
|
'Writing: '+`data`+', expected: '+`expected`
|
|
def close(self):
|
|
self.fp.close()
|
|
|
|
# The main program
|
|
def main():
|
|
import sys
|
|
filename = findfile('testall.out')
|
|
real_stdout = sys.stdout
|
|
try:
|
|
sys.stdout = Compare().init(filename)
|
|
import testall
|
|
finally:
|
|
sys.stdout = real_stdout
|
|
print 'All tests OK.'
|
|
|
|
main()
|