unit/bacnet/bits test (#391)

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

zephyr/tests/unit/bacnet/bits/CMakeLists.txt

@@ -0,0 +1,26 @@
+# Copyright (c) 2022 Legrand North America, LLC.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+
+if(NOT ZEPHYR_CURRENT_MODULE_DIR)
+  string(REGEX REPLACE "/zephyr/tests/[a-zA-Z_/-]*$" ""
+    ZEPHYR_CURRENT_MODULE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
+endif()
+
+set(SOURCES
+  ${ZEPHYR_CURRENT_MODULE_DIR}/test/unit/bacnet/bits/src/main.c
+  )
+
+project(bacnet_bits)
+find_package(Zephyr COMPONENTS unittest REQUIRED HINTS $ENV{ZEPHYR_BASE})
+
+# NOTE for Zephyr >= v3.2.0:
+# - Zephyr unittest builds for target 'testbinary' instead of 'app'.
+# - Zephyr unittest does not generate ZEPHYR_<modulename>_MODULE_DIR.
+# So we have to use relative paths to get to the source.
+
+target_include_directories(testbinary PRIVATE
+  ${ZEPHYR_CURRENT_MODULE_DIR}/src
+  )

zephyr/tests/unit/bacnet/bits/prj.conf

@@ -0,0 +1 @@
+# This file is intentionally empty

zephyr/tests/unit/bacnet/bits/testcase.yaml

@@ -0,0 +1,3 @@
+tests:
+  bacnet.bits.unit:
+    type: unit