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/rd/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/rd.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/rd/src/main.c

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2020 Legrand North America, LLC.
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+/* @file
+ * @brief test BACnet integer encode/decode APIs
+ */
+
+#include <ztest.h>
+#include <bacnet/bacstr.h>
+#include <bacnet/rd.h>
+
+/**
+ * @addtogroup bacnet_tests
+ * @{
+ */
+
+/**
+ * @brief Test
+ */
+static int rd_decode_apdu(uint8_t *apdu,
+    unsigned apdu_len,
+    uint8_t *invoke_id,
+    BACNET_REINITIALIZED_STATE *state,
+    BACNET_CHARACTER_STRING *password)
+{
+    int len = 0;
+    unsigned offset = 0;
+
+    if (!apdu)
+        return -1;
+    /* optional checking - most likely was already done prior to this call */
+    if (apdu[0] != PDU_TYPE_CONFIRMED_SERVICE_REQUEST)
+        return -1;
+    /*  apdu[1] = encode_max_segs_max_apdu(0, MAX_APDU); */
+    *invoke_id = apdu[2]; /* invoke id - filled in by net layer */
+    if (apdu[3] != SERVICE_CONFIRMED_REINITIALIZE_DEVICE)
+        return -1;
+    offset = 4;
+
+    if (apdu_len > offset) {
+        len = rd_decode_service_request(
+            &apdu[offset], apdu_len - offset, state, password);
+    }
+
+    return len;
+}
+
+static void test_ReinitializeDevice(void)
+{
+    uint8_t apdu[480] = { 0 };
+    int len = 0;
+    int apdu_len = 0;
+    uint8_t invoke_id = 128;
+    uint8_t test_invoke_id = 0;
+    BACNET_REINITIALIZED_STATE state;
+    BACNET_REINITIALIZED_STATE test_state;
+    BACNET_CHARACTER_STRING password;
+    BACNET_CHARACTER_STRING test_password;
+
+    state = BACNET_REINIT_WARMSTART;
+    characterstring_init_ansi(&password, "John 3:16");
+    len = rd_encode_apdu(&apdu[0], invoke_id, state, &password);
+    zassert_not_equal(len, 0, NULL);
+    apdu_len = len;
+
+    len = rd_decode_apdu(
+        &apdu[0], apdu_len, &test_invoke_id, &test_state, &test_password);
+    zassert_not_equal(len, -1, NULL);
+    zassert_equal(test_invoke_id, invoke_id, NULL);
+    zassert_equal(test_state, state, NULL);
+    zassert_true(characterstring_same(&test_password, &password), NULL);
+
+    return;
+}
+/**
+ * @}
+ */
+
+
+void test_main(void)
+{
+    ztest_test_suite(rd_tests,
+     ztest_unit_test(test_ReinitializeDevice)
+     );
+
+    ztest_run_test_suite(rd_tests);
+}