diff tests/test-dirs.py @ 43494:5d40317d42b7

dirs: reject consecutive slashes in paths

We shouldn't ever see those, and the fuzzer go really excited that if
it gives us a 65k string with 55k slashes in it we use a lot of RAM.

This is a better fix than what I tried in D7105. It was suggested by
Yuya, and I verified it does in fact cause the fuzzer to not OOM.

This is a revision of D7234, but with the missing set of an error
added. I added a unit test of the dirs behavior because I needed to
reason more carefully about the failure modes around consecutive
slashes.

Differential Revision: https://phab.mercurial-scm.org/D7252

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-dirs.py	Thu Oct 17 19:29:22 2019 -0400
@@ -0,0 +1,27 @@
+from __future__ import absolute_import
+
+import unittest
+
+import silenttestrunner
+
+from mercurial import util
+
+
+class dirstests(unittest.TestCase):
+    def testdirs(self):
+        for case, want in [
+            (b'a/a/a', [b'a', b'a/a', b'']),
+            (b'alpha/beta/gamma', [b'', b'alpha', b'alpha/beta']),
+        ]:
+            d = util.dirs({})
+            d.addpath(case)
+            self.assertEqual(sorted(d), sorted(want))
+
+    def testinvalid(self):
+        with self.assertRaises(ValueError):
+            d = util.dirs({})
+            d.addpath(b'a//b')
+
+
+if __name__ == '__main__':
+    silenttestrunner.main(__name__)