added coverage to unit tests

.vscode/extensions.json

@@ -1,10 +0,0 @@
-{
-    // See http://go.microsoft.com/fwlink/?LinkId=827846
-    // for the documentation about the extensions.json format
-    "recommendations": [
-        "platformio.platformio-ide"
-    ],
-    "unwantedRecommendations": [
-        "ms-vscode.cpptools-extension-pack"
-    ]
-}

platformio.ini

@@ -268,11 +268,10 @@ build_flags =
   -DARDUINOJSON_ENABLE_ARDUINO_STRING=1
   -DEMSESP_DEBUG -DEMSESP_STANDALONE -DEMSESP_TEST -DUNITY_INCLUDE_CONFIG_H
   -DEMSESP_DEFAULT_LOCALE=\"en\" -DEMSESP_DEFAULT_TX_MODE=8 -DEMSESP_DEFAULT_VERSION=\"3.7.0-dev.0\" -DEMSESP_DEFAULT_BOARD_PROFILE=\"S32\"
-  -std=gnu++14 -Og -ggdb
-  -lgcov --coverage
+  -std=gnu++14 -Os -ggdb -Wall -Wextra -Werror
+  -lgcov --coverage -fprofile-arcs -ftest-coverage
 build_type = debug
 build_src_flags =
-  -Wall -Wextra -Werror
   -Wno-unused-parameter -Wno-sign-compare -Wno-missing-braces
   -I./lib_standalone
   -I./lib/uuid-common/src