Prepare unit tests for LEDs

tests/unit/modules/CMakeLists.txt

@@ -1,2 +1,3 @@
 add_subdirectory(buttons)
+add_subdirectory(leds)
 add_subdirectory(protocol)

tests/unit/modules/leds/CMakeLists.txt

@@ -0,0 +1,10 @@
+# define the test executable
+add_executable(leds_tests ../../../../src/modules/leds.cpp test_leds.cpp)
+
+# define required search paths
+target_include_directories(
+  leds_tests PUBLIC ${CMAKE_SOURCE_DIR}/src/modules ${CMAKE_SOURCE_DIR}/src/hal
+  )
+
+# tell build system about the test case
+add_catch_test(leds_tests)

tests/unit/modules/leds/test_leds.cpp

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