diff --git a/apps/fg_http/test/fg_http/util/fg_crypto_test.exs b/apps/fg_http/test/fg_http/util/fg_crypto_test.exs
new file mode 100644
index 000000000..eb97c67b2
--- /dev/null
+++ b/apps/fg_http/test/fg_http/util/fg_crypto_test.exs
@@ -0,0 +1,17 @@
+defmodule FgHttp.Util.FgCryptoTest do
+  use ExUnit.Case, async: true
+
+  alias FgHttp.Util.FgCrypto
+
+  describe "rand_string" do
+    test "it returns a string of default length" do
+      assert 16 == String.length(FgCrypto.rand_string())
+    end
+
+    test "it returns a string of proper length" do
+      for length <- [1, 32, 32_768] do
+        assert length == String.length(FgCrypto.rand_string(length))
+      end
+    end
+  end
+end