tests: add test for at24mac driver

tests/driver_at24mac/Makefile

@@ -0,0 +1,5 @@
+include ../Makefile.tests_common
+
+USEMODULE += at24mac
+
+include $(RIOTBASE)/Makefile.include

tests/driver_at24mac/main.c

@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2019 Benjamin Valentin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     tests
+ * @{
+ *
+ * @file
+ * @brief       Test application for the AT24MAC driver
+ *
+ * @author      Benjamin Valentin <benjamin.valentin@ml-pa.com>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+#include "at24mac.h"
+
+int main(void)
+{
+    eui48_t e48;
+    eui64_t e64;
+    uint8_t id[AT24MAC_ID_LEN];
+
+    if (at24mac_get_eui48(0, &e48) != 0) {
+        puts("[FAILED]");
+        return 1;
+    }
+
+    if (at24mac_get_eui64(0, &e64) != 0) {
+        puts("[FAILED]");
+        return 1;
+    }
+
+    if (at24mac_get_id128(0, &id) != 0) {
+        puts("[FAILED]");
+        return 1;
+    }
+
+    printf("EUI-48:");
+    for (unsigned i = 0; i < sizeof(e48.uint8); ++i) {
+        printf(" %02x", e48.uint8[i]);
+    }
+    puts("");
+
+    printf("EUI-64:");
+    for (unsigned i = 0; i < sizeof(e64.uint8); ++i) {
+        printf(" %02x", e64.uint8[i]);
+    }
+    puts("");
+
+    printf("ID-128:");
+    for (unsigned i = 0; i < sizeof(id); ++i) {
+        printf(" %02x", id[i]);
+    }
+    puts("");
+
+    puts("[SUCCESS]");
+
+    return 0;
+}