Add first unit test

+proof of concept of Catch2 builds working in our repo

CMakeLists.txt

@@ -155,7 +155,7 @@ endif()
 # Import definitions of all libraries
 #
 
-# add_subdirectory(lib)
+add_subdirectory(lib)
 
 #
 # MMU firmware

lib/CMakeLists.txt

@@ -0,0 +1,3 @@
+if(NOT CMAKE_CROSSCOMPILING)
+  add_subdirectory(Catch2)
+endif()

tests/CMakeLists.txt

@@ -1 +1 @@
-#
+add_subdirectory(unit)

tests/unit/CMakeLists.txt

@@ -1 +1,28 @@
-#
+# first, let's create a symbolic target for all tests
+add_custom_target(tests)
+
+# this had a reason on the Buddy FW, but on the AVR we cannot get close to having 16bit ints and
+# pointers so the unit tests may be compiled 64bit afterall
+set(CMAKE_C_FLAGS -m32)
+set(CMAKE_CXX_FLAGS -m32)
+
+# include catch_discover_tests function from Catch2
+include(${Catch2_SOURCE_DIR}/contrib/Catch.cmake)
+
+add_library(catch_main ${CMAKE_CURRENT_SOURCE_DIR}/test_main.cpp)
+target_link_libraries(catch_main Catch2::Catch2)
+
+# registers given target as a catch test
+function(add_catch_test target)
+  target_link_libraries(${target} catch_main Catch2::Catch2)
+  catch_discover_tests(${target})
+  add_dependencies(tests ${target})
+endfunction()
+
+add_executable(system_tests ${CMAKE_CURRENT_SOURCE_DIR}/system_test.cpp)
+add_catch_test(system_tests)
+
+# now, include all the unit tests; they should add themselves using the add_catch_test function
+add_subdirectory(hal)
+add_subdirectory(logic)
+add_subdirectory(modules)

tests/unit/hal/CMakeLists.txt

@@ -0,0 +1 @@
+#

tests/unit/logic/CMakeLists.txt

@@ -0,0 +1 @@
+#

tests/unit/modules/CMakeLists.txt

@@ -0,0 +1 @@
+add_subdirectory(protocol)

tests/unit/modules/protocol/CMakeLists.txt

@@ -0,0 +1,8 @@
+# define the test executable
+add_executable(protocol_tests test_protocol.cpp)
+
+# define required search paths
+target_include_directories(protocol_tests PUBLIC ${CMAKE_SOURCE_DIR}/src/modules)
+
+# tell build system about the test case
+add_catch_test(protocol_tests)

tests/unit/modules/protocol/test_protocol.cpp

@@ -0,0 +1,8 @@
+#include "catch2/catch.hpp"
+#include "protocol.h"
+
+using Catch::Matchers::Equals;
+
+TEST_CASE("protocol::1", "[protocol]") {
+    CHECK(true);
+}

tests/unit/system_test.cpp

@@ -0,0 +1,6 @@
+#include "catch2/catch.hpp"
+
+TEST_CASE("type tests", "[system]") {
+    REQUIRE(sizeof(uint64_t) == 8);
+    REQUIRE(sizeof(char *) == 4);
+}

tests/unit/test_main.cpp

@@ -0,0 +1,3 @@
+#define CATCH_CONFIG_MAIN
+//#define CATCH_CONFIG_ENABLE_BENCHMARKING
+#include "catch2/catch.hpp"