diff --git a/ncsid/test/normalize_mac_test.sh b/ncsid/test/normalize_mac_test.sh
new file mode 100755
index 0000000..4c94570
--- /dev/null
+++ b/ncsid/test/normalize_mac_test.sh
@@ -0,0 +1,29 @@
+#!/bin/bash
+TEST_DIR="$(dirname "${BASH_SOURCE[0]}")"
+source "$TEST_DIR"/test_lib.sh
+
+TestNormalizeMACInvalidArgs() {
+  ! "$NORMALIZE_MAC"
+  ! "$NORMALIZE_MAC" '0:0:0:0:0:0' 'extra'
+}
+
+TestNormalizeMACBadMAC() {
+  ! "$NORMALIZE_MAC" '0:0'
+  ! "$NORMALIZE_MAC" '0:0:0:0:0:0:0'
+  ! "$NORMALIZE_MAC" '1ff:0:0:0:0'
+}
+
+TestNormalizeMACSuccess() {
+  StrEq "$("$NORMALIZE_MAC" '0:0:0:0:0:0')" '00:00:00:00:00:00'
+  StrEq "$("$NORMALIZE_MAC" 'ff:0f:0:0:11:1')" 'ff:0f:00:00:11:01'
+  StrEq "$("$NORMALIZE_MAC" '0:0:0:0:0:ff')" "$("$NORMALIZE_MAC" '0:0:0:0:0:FF')"
+}
+
+TESTS+=(
+  TestNormalizeMACInvalidArgs
+  TestNormalizeMACBadMAC
+  TestNormalizeMACSuccess
+)
+
+return 0 2>/dev/null
+TestAnythingMain