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diff --git a/test/polyjuice/client/endpoint_test.exs b/test/polyjuice/client/endpoint_test.exs
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+# Copyright 2020 Hubert Chathi <hubert@uhoreg.ca>
+#
+# 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.
+
+defmodule Polyjuice.Client.EndpointTest do
+  use ExUnit.Case
+
+  test "parse response" do
+    # just test the error handling -- successful responses will be checked by
+    # the various endpoint tests
+
+    # the server returned a Matrix error
+    assert Polyjuice.Client.Endpoint.parse_response(
+             %{},
+             404,
+             [],
+             ~s({"errcode": "M_NOT_FOUND", "error": "not found"})
+           ) == {:error, 404, %{"errcode" => "M_NOT_FOUND", "error" => "not found"}}
+
+    # the server claims to have succeeded, but the body is not JSON
+    assert Polyjuice.Client.Endpoint.parse_response(%{}, 200, [], "not JSON") ==
+             {:error, 500,
+              %{"errcode" => "CA_UHOREG_POLYJUICE_BAD_RESPONSE", "body" => "not JSON"}}
+
+    # the server returned a non-Matrix error
+    assert Polyjuice.Client.Endpoint.parse_response(%{}, 404, [], "Not found") ==
+             {:error, 404,
+              %{"errcode" => "CA_UHOREG_POLYJUICE_BAD_RESPONSE", "body" => "Not found"}}
+  end
+end