Update tests

Author: corka149

lib/jsonpatch/path_util.ex

@@ -205,12 +205,8 @@ defmodule Jsonpatch.PathUtil do
     end
   end
 
-  defp is_number?(term) when is_binary(term) do
-    Regex.match?(~r/^\d+$/, term)
-  end
-
-  defp is_number?(_term) do
-    false
+  defp is_number?(term) do
+    is_binary(term) and Regex.match?(~r/^\d+$/, term)
   end
 
   defp do_unescape(fragment, pattern, replacement) when is_binary(fragment) do

test/jsonpatch_test.exs

@@ -50,6 +50,10 @@ defmodule JsonpatchTest do
       assert [%Remove{path: "/baz"}] = patch
     end
 
+    test "Create no diff on unexpected input" do
+      assert [] = Jsonpatch.diff("unexpected", 1)
+    end
+
     test "A.4. Removing an Array Element" do
       source = %{"a" => %{"b" => ["c", "d"]}}
       destination = %{"a" => %{"b" => ["c"]}}