Configure project for code coverage.

test_apps/main/CMakeLists.txt

@@ -15,6 +15,13 @@ message(STATUS "srcs=${srcs}")
 idf_component_register(
     SRCS ${srcs}
     INCLUDE_DIRS "."
-    REQUIRES unity relay_chn
+    REQUIRES unity relay_chn app_trace
     WHOLE_ARCHIVE
 )
+
+set_source_files_properties(
+    "test_common.c"
+    "test_app_main.c"
+    "test_relay_chn_core.c"
+    "test_relay_chn_listener.c"
+    PROPERTIES COMPILE_FLAGS --coverage)