From 47fd8a9859612b42bb5c3c5c6a7b45ee95fd00a9 Mon Sep 17 00:00:00 2001
From: Robert Francis <robertefrancis18@gmail.com>
Date: Wed, 12 Dec 2018 12:16:10 +0000
Subject: [PATCH] adds tests for util.ex

---
 lib/util.ex        | 12 ++++++++++++
 test/util_test.exs |  5 +++++
 2 files changed, 17 insertions(+)
 create mode 100644 test/util_test.exs

diff --git a/lib/util.ex b/lib/util.ex
index 4760616..f29c21b 100644
--- a/lib/util.ex
+++ b/lib/util.ex
@@ -8,6 +8,18 @@ defmodule Multihash.Util do
     * :sha1
     * :sha2_256
     * :sha2_512
+
+  ## Examples
+
+      iex> Multihash.Util.sum("Hello", :sha1)
+      <<17, 20, 247, 255, 158, 139, 123, 178, 224, 155, 112, 147, 90, 93, 120, 94, 12, 197, 217, 208, 171, 240>>
+
+      iex> Multihash.Util.sum("Hello", :sha2_256)
+      <<18, 32, 24, 95, 141, 179, 34, 113, 254, 37, 245, 97, 166, 252, 147, 139, 46, 38, 67, 6, 236, 48, 78, 218, 81, 128, 7, 209, 118, 72, 38, 56, 25, 105>>
+
+      iex> Multihash.Util.sum("Hello", :sha2_512)
+      <<19, 64, 54, 21, 248, 12, 157, 41, 62, 215, 64, 38, 135, 249, 75, 34, 213, 142, 82, 155, 140, 199, 145, 111, 143, 172, 127, 221, 247, 251, 213, 175, 76, 247, 119, 211, 215, 149, 167, 160, 10, 22, 191, 126, 127, 63, 185, 86, 30, 233, 186, 174, 72, 13, 169, 254, 122, 24, 118, 158, 113, 136, 107, 3, 243, 21>>
+
   """
   @spec sum(binary, Multihash.hash_type) :: binary
   def sum(data, :sha1), do: :crypto.hash(:sha, data) |> create_multihash(:sha1)
diff --git a/test/util_test.exs b/test/util_test.exs
new file mode 100644
index 0000000..8b9abdb
--- /dev/null
+++ b/test/util_test.exs
@@ -0,0 +1,5 @@
+defmodule Multihash.UtilTest do
+  use ExUnit.Case, async: true
+  doctest Multihash.Util
+
+end