Add email challenge module

Refs: #4053

Change-Id: Ic5093fa484df967a760d7503eab2436f5794a385
diff --git a/tests/unit-tests/test-send-email.sh b/tests/unit-tests/test-send-email.sh
new file mode 100755
index 0000000..78117fc
--- /dev/null
+++ b/tests/unit-tests/test-send-email.sh
@@ -0,0 +1,8 @@
+#!/bin/sh
+
+RECEIVER=$1
+SECRET=$2
+
+MESSAGE=$RECEIVER$SECRET
+
+echo $MESSAGE