diff --git a/src/_zkapauthorizer/tests/test_foolscap.py b/src/_zkapauthorizer/tests/test_foolscap.py
new file mode 100644
index 0000000000000000000000000000000000000000..388cc116fe71613c28419f87cdf6e2c4777e68c7
--- /dev/null
+++ b/src/_zkapauthorizer/tests/test_foolscap.py
@@ -0,0 +1,97 @@
+# Copyright 2019 PrivateStorage.io, LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""
+Tests for Foolscap-related test helpers.
+"""
+
+from __future__ import (
+    absolute_import,
+)
+
+from testtools import (
+    TestCase,
+)
+from testtools.matchers import (
+    MatchesAll,
+    AfterPreprocessing,
+    Always,
+    IsInstance,
+)
+
+from foolscap.furl import (
+    decode_furl,
+)
+from foolscap.pb import (
+    Tub,
+)
+from foolscap.referenceable import (
+    RemoteReferenceTracker,
+    RemoteReferenceOnly,
+)
+
+from hypothesis import (
+    given,
+)
+from hypothesis.strategies import (
+    one_of,
+    just,
+)
+
+from .foolscap import (
+    RIStub,
+    LocalRemote,
+    DummyReferenceable,
+)
+
+def remote_reference():
+    tub = Tub()
+    tub.setLocation("127.0.0.1:12345")
+    url = tub.buildURL(b"efgh")
+
+    # Ugh ugh ugh.  Skip over the extra correctness checking in
+    # RemoteReferenceTracker.__init__ that requires having a broker by passing
+    # the url as None and setting it after.
+    tracker = RemoteReferenceTracker(None, None, None, RIStub)
+    tracker.url = url
+
+    ref = RemoteReferenceOnly(tracker)
+    return ref
+
+
+class LocalRemoteTests(TestCase):
+    """
+    Tests for the ``LocalRemote`` test double.
+    """
+    @given(
+        ref=one_of(
+            just(remote_reference()),
+            just(LocalRemote(DummyReferenceable(RIStub))),
+        ),
+    )
+    def test_tracker_url(self, ref):
+        """
+        The URL of a remote reference can be retrieved using the tracker
+        attribute.
+        """
+        self.assertThat(
+            ref.tracker.getURL(),
+            MatchesAll(
+                IsInstance(bytes),
+                AfterPreprocessing(
+                    decode_furl,
+                    Always(),
+                ),
+            ),
+        )