def _diff(self, baselinedir, outputdir, dc=None):
if dc is None:
dc = filecmp.dircmp(baselinedir,
outputdir,
['.svn'])
if dc.left_only:
self.fail("Files or subdirectories missing from output: "
+str(dc.left_only))
if dc.right_only:
self.fail("Files or subdirectories missing from baseline: "
+str(dc.right_only))
for name in dc.diff_files:
fromfile = join(dc.left, name)
tofile = join(dc.right, name)
with open(fromfile, 'r') as f_from:
fromlines = f_from.readlines()
with open(tofile, 'r') as f_to:
tolines = f_to.readlines()
diff = difflib.context_diff(fromlines, tolines,
fromfile+" (baseline)",
tofile+" (output)")
diff = list(diff)
# The filecmp.dircmp function does a weaker
# comparison that can sometimes lead to false
# positives. Make sure the true diff is not empty
# before we call this a failure.
if len(diff) > 0:
out = StringIO()
out.write("Output file does not match baseline:\n")
for line in diff:
out.write(line)
self.fail(out.getvalue())
for subdir in dc.subdirs:
self._diff(join(baselinedir, subdir),
join(outputdir, subdir),
dc=dc.subdirs[subdir])
shutil.rmtree(outputdir, ignore_errors=True)
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