net/nanocoap: add test for message ID byte order

tests/unittests/tests-nanocoap/Makefile

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+include $(RIOTBASE)/Makefile.base

tests/unittests/tests-nanocoap/Makefile.include

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+USEMODULE += nanocoap

tests/unittests/tests-nanocoap/tests-nanocoap.c

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+/*
+ * Copyright (c) 2018 Ken Bannister. All rights reserved.
+ *
+ * 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.
+ */
+
+/**
+ * @{
+ *
+ * @file
+ */
+#include <errno.h>
+#include <stdint.h>
+
+#include "embUnit.h"
+
+#include "net/nanocoap.h"
+
+#include "unittests-constants.h"
+#include "tests-nanocoap.h"
+
+/*
+ * Validates encoded message ID byte order.
+ */
+static void test_nanocoap__req_msgid(void)
+{
+    uint8_t buf[128];
+    uint16_t msgid = 0xABCD;
+    char path[] = "/test";
+
+    uint8_t *pktpos = &buf[0];
+    pktpos += coap_build_hdr((coap_hdr_t *)pktpos, COAP_REQ, NULL, 0, COAP_METHOD_GET, msgid);
+    pktpos += coap_put_option_uri(pktpos, 0, path, COAP_OPT_URI_PATH);
+
+    coap_pkt_t pkt;
+    coap_parse(&pkt, &buf[0], pktpos - &buf[0]);
+
+    TEST_ASSERT_EQUAL_INT(msgid, coap_get_id(&pkt));
+}
+
+Test *tests_nanocoap_tests(void)
+{
+    EMB_UNIT_TESTFIXTURES(fixtures) {
+        new_TestFixture(test_nanocoap__req_msgid),
+    };
+
+    EMB_UNIT_TESTCALLER(nanocoap_tests, NULL, NULL, fixtures);
+
+    return (Test *)&nanocoap_tests;
+}
+
+void tests_nanocoap(void)
+{
+    TESTS_RUN(tests_nanocoap_tests());
+}
+/** @} */

tests/unittests/tests-nanocoap/tests-nanocoap.h

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+/*
+ * Copyright (c) 2018 Ken Bannister. All rights reserved.
+ *
+ * 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.
+ */
+
+/**
+ * @addtogroup  unittests
+ * @{
+ *
+ * @file
+ * @brief       Unit tests for the nanocoap module
+ *
+ * @author      Ken Bannister <kb2ma@runbox.com>
+ */
+#ifndef TESTS_NANOCOAP_H
+#define TESTS_NANOCOAP_H
+
+#include "embUnit.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief   The entry point of this test suite.
+ */
+void tests_nanocoap(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* TESTS_NANOCOAP_H */
+/** @} */