Feature/zephyr ztest (#118)

* Leverage (older) embedded unit tests into external unit tests build upon copy of Zephyr's ztest library and CMake.

* Expand top-level CMake build to run external unit tests.

* Expand Zephyr module extension to run external unit tests via west or sanitycheck.

Co-authored-by: Gregory Shue <gregory.shue@legrand.us>

test/bacnet/reject/CMakeLists.txt

@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: MIT
+
+cmake_minimum_required(VERSION 3.10 FATAL_ERROR)
+
+get_filename_component(basename ${CMAKE_CURRENT_SOURCE_DIR} NAME)
+project(test_${basename}
+	VERSION 1.0.0
+	LANGUAGES C)
+
+
+string(REGEX REPLACE "/bacnet/[a-zA-Z_/-]*$" "" TST_DIR ${CMAKE_CURRENT_SOURCE_DIR})
+set(ZTST_DIR "${TST_DIR}/ztest/src")
+string(REGEX REPLACE "/test$" "/src" SRC_DIR ${TST_DIR})
+
+add_compile_definitions(
+	BIG_ENDIAN=0
+	CONFIG_ZTEST=1
+	)
+
+include_directories(
+	${SRC_DIR}
+	${TST_DIR}/ztest/include
+	)
+
+add_executable(${PROJECT_NAME}
+    # File(s) under test
+	${SRC_DIR}/bacnet/reject.c
+    # Support files and stubs (pathname alphabetical)
+	${SRC_DIR}/bacnet/bacdcode.c
+	${SRC_DIR}/bacnet/bacint.c
+	${SRC_DIR}/bacnet/bacreal.c
+	${SRC_DIR}/bacnet/bacstr.c
+	${SRC_DIR}/bacnet/basic/sys/bigend.c
+    # Test and test library files
+	./src/main.c
+	${ZTST_DIR}/ztest_mock.c
+	${ZTST_DIR}/ztest.c
+	)

test/bacnet/reject/src/main.c

@@ -0,0 +1,127 @@
+/*
+ * Copyright (c) 2020 Legrand North America, LLC.
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+/* @file
+ * @brief test BACnet integer encode/decode APIs
+ */
+
+#include <ztest.h>
+#include <bacnet/reject.h>
+
+/**
+ * @addtogroup bacnet_tests
+ * @{
+ */
+
+/**
+ * @brief Test
+ */
+/* decode the whole APDU - mainly used for unit testing */
+static int reject_decode_apdu(uint8_t *apdu,
+    unsigned apdu_len,
+    uint8_t *invoke_id,
+    uint8_t *reject_reason)
+{
+    int len = 0;
+
+    if (!apdu)
+        return -1;
+    /* optional checking - most likely was already done prior to this call */
+    if (apdu_len) {
+        if (apdu[0] != PDU_TYPE_REJECT)
+            return -1;
+        if (apdu_len > 1) {
+            len = reject_decode_service_request(
+                &apdu[1], apdu_len - 1, invoke_id, reject_reason);
+        }
+    }
+
+    return len;
+}
+
+static void testRejectEncodeDecode(void)
+{
+    uint8_t apdu[480] = { 0 };
+    int len = 0;
+    int apdu_len = 0;
+    uint8_t invoke_id = 0;
+    uint8_t reject_reason = 0;
+    uint8_t test_invoke_id = 0;
+    uint8_t test_reject_reason = 0;
+
+    len = reject_encode_apdu(&apdu[0], invoke_id, reject_reason);
+    zassert_not_equal(len, 0, NULL);
+    apdu_len = len;
+
+    len = reject_decode_apdu(
+        &apdu[0], apdu_len, &test_invoke_id, &test_reject_reason);
+    zassert_not_equal(len, -1, NULL);
+    zassert_equal(test_invoke_id, invoke_id, NULL);
+    zassert_equal(test_reject_reason, reject_reason, NULL);
+
+    /* change type to get negative response */
+    apdu[0] = PDU_TYPE_ABORT;
+    len = reject_decode_apdu(
+        &apdu[0], apdu_len, &test_invoke_id, &test_reject_reason);
+    zassert_equal(len, -1, NULL);
+
+    /* test NULL APDU */
+    len = reject_decode_apdu(
+        NULL, apdu_len, &test_invoke_id, &test_reject_reason);
+    zassert_equal(len, -1, NULL);
+
+    /* force a zero length */
+    len = reject_decode_apdu(&apdu[0], 0, &test_invoke_id, &test_reject_reason);
+    zassert_equal(len, 0, NULL);
+
+    /* check them all...   */
+    for (invoke_id = 0; invoke_id < 255; invoke_id++) {
+        for (reject_reason = 0; reject_reason < 255; reject_reason++) {
+            len = reject_encode_apdu(&apdu[0], invoke_id, reject_reason);
+            apdu_len = len;
+            zassert_not_equal(len, 0, NULL);
+            len = reject_decode_apdu(
+                &apdu[0], apdu_len, &test_invoke_id, &test_reject_reason);
+            zassert_not_equal(len, -1, NULL);
+            zassert_equal(test_invoke_id, invoke_id, NULL);
+            zassert_equal(test_reject_reason, reject_reason, NULL);
+        }
+    }
+}
+
+static void testRejectErrorCode(void)
+{
+    int i;
+    BACNET_ERROR_CODE error_code;
+    BACNET_REJECT_REASON reject_reason;
+    BACNET_REJECT_REASON test_reject_reason;
+
+    for (i = 0; i < MAX_BACNET_REJECT_REASON; i++) {
+        reject_reason = (BACNET_REJECT_REASON)i;
+        error_code = reject_convert_to_error_code(reject_reason);
+        test_reject_reason = reject_convert_error_code(error_code);
+        if (test_reject_reason != reject_reason) {
+            printf("Reject: result=%u reject-code=%u\n",
+                test_reject_reason,
+                reject_reason);
+        }
+        zassert_equal(test_reject_reason, reject_reason, NULL);
+    }
+}
+/**
+ * @}
+ */
+
+
+void test_main(void)
+{
+    ztest_test_suite(reject_tests,
+     ztest_unit_test(testRejectEncodeDecode),
+     ztest_unit_test(testRejectErrorCode)
+     );
+
+    ztest_run_test_suite(reject_tests);
+}