add test for sync, and fix some bugs

1 files changed, 40 insertions, 0 deletions

diff --git a/test/support/test_util.ex b/test/support/test_util.ex
new file mode 100644
index 0000000..2724678
--- /dev/null
+++ b/test/support/test_util.ex
@@ -0,0 +1,40 @@
+# 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 TestUtil do
+  def mktmpdir(prefix) do
+    Enum.find_value(
+      1..5,
+      {:error, :efail},
+      fn _ ->
+        random =
+          Enum.map(
+            Range.new(0, 12),
+            fn _ -> Enum.random('abcdefghijklmnopqrstuvwxyz1234567890') end
+          )
+          |> to_string()
+
+        tmpdir = Path.join(System.tmp_dir!(), prefix <> random)
+
+        case File.mkdir(tmpdir) do
+          :ok -> {:ok, tmpdir}
+          # try again if the name is already taken
+          {:error, :eexist} -> nil
+          # pass through any other errors
+          {:error, _} = err -> err
+        end
+      end
+    )
+  end
+end