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