Port to Python 3.

src/allmydata/test/matchers.py

@@ -1,6 +1,16 @@
 """
 Testtools-style matchers useful to the Tahoe-LAFS test suite.
+
+Ported to Python 3.
 """
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+from future.utils import PY2
+if PY2:
+    from future.builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, list, object, range, str, max, min  # noqa: F401
 
 import attr
 

src/allmydata/util/_python3.py

@@ -87,6 +87,7 @@ PORTED_MODULES = [
     "allmydata.storage.server",
     "allmydata.storage.shares",
     "allmydata.test.no_network",
+    "allmydata.test.matchers",
     "allmydata.test.mutable.util",
     "allmydata.unknown",
     "allmydata.uri",