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/basic/object/acc/CMakeLists.txt

@@ -0,0 +1,44 @@
+# 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/basic/object/acc.c
+    # Support files and stubs (pathname alphabetical)
+	${SRC_DIR}/bacnet/bacapp.c
+	${SRC_DIR}/bacnet/bacdcode.c
+	${SRC_DIR}/bacnet/bacdevobjpropref.c
+	${SRC_DIR}/bacnet/bacint.c
+	${SRC_DIR}/bacnet/bacreal.c
+	${SRC_DIR}/bacnet/bacstr.c
+	${SRC_DIR}/bacnet/bactext.c
+	${SRC_DIR}/bacnet/basic/sys/bigend.c
+	${SRC_DIR}/bacnet/datetime.c
+	${SRC_DIR}/bacnet/indtext.c
+	${SRC_DIR}/bacnet/lighting.c
+    # Test and test library files
+	./src/main.c
+	${ZTST_DIR}/ztest_mock.c
+	${ZTST_DIR}/ztest.c
+	)

test/bacnet/basic/object/acc/src/main.c

@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2020 Legrand North America, LLC.
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+/* @file
+ * @brief test BACnet integer encode/decode APIs
+ */
+
+#include <ztest.h>
+#include <bacnet/basic/object/acc.h>
+
+/**
+ * @addtogroup bacnet_tests
+ * @{
+ */
+
+/**
+ * @brief Test
+ */
+static void test_Accumulator(void)
+{
+#if 0 /*TODO: Refactor implementation to expose for testing */
+    uint8_t apdu[MAX_APDU] = { 0 };
+    int len = 0;
+    int test_len = 0;
+    BACNET_READ_PROPERTY_DATA rpdata = {0};
+    BACNET_APPLICATION_DATA_VALUE value = {0};
+    const int *property = &Properties_Required[0];
+    BACNET_UNSIGNED_INTEGER unsigned_value = 1;
+
+    Accumulator_Init();
+    rpdata.application_data = &apdu[0];
+    rpdata.application_data_len = sizeof(apdu);
+    rpdata.object_type = OBJECT_ACCUMULATOR;
+    rpdata.object_instance = 1;
+
+    while ((*property) >= 0) {
+        rpdata.object_property = *property;
+        rpdata.array_index = BACNET_ARRAY_ALL;
+        len = Accumulator_Read_Property(&rpdata);
+        zassert_not_equal(len, 0, NULL);
+        if (IS_CONTEXT_SPECIFIC(rpdata.application_data[0])) {
+            test_len = bacapp_decode_context_data(rpdata.application_data,
+                len, &value, rpdata.object_property);
+        } else {
+            test_len = bacapp_decode_application_data(rpdata.application_data,
+                len, &value);
+        }
+        if (len != test_len) {
+            printf("property '%s': failed to decode!\n",
+                bactext_property_name(rpdata.object_property));
+        }
+        zassert_equal(len, test_len, NULL);
+        property++;
+    }
+    /* test 1-bit to 64-bit encode/decode of present-value */
+    rpdata.object_property = PROP_PRESENT_VALUE;
+    while (unsigned_value != BACNET_UNSIGNED_INTEGER_MAX) {
+        Accumulator_Present_Value_Set(0, unsigned_value);
+        len = Accumulator_Read_Property(&rpdata);
+        zassert_not_equal(len, 0, NULL);
+        test_len = bacapp_decode_application_data(rpdata.application_data,
+            len, &value);
+        zassert_equal(len, test_len, NULL);
+        unsigned_value |= (unsigned_value<<1);
+    }
+
+    return;
+#else
+    ztest_test_skip();
+#endif
+}
+/**
+ * @}
+ */
+
+
+void test_main(void)
+{
+    ztest_test_suite(acc_tests,
+     ztest_unit_test(test_Accumulator)
+     );
+
+    ztest_run_test_suite(acc_tests);
+}