fix: native code coverage

Author: melchor629

CMakeLists.txt

@@ -11,8 +11,9 @@ set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 if(COVERAGE)
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fprofile-arcs -ftest-coverage")
-  set(CMAKE_LINKER_FLAGS "${CMAKE_LINKER_FLAGS}")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --coverage")
+  set(CMAKE_LINKER_FLAGS "${CMAKE_LINKER_FLAGS} --coverage")
+  add_compile_definitions(COVERAGE)
   message("-- Enabled code coverage")
 endif()
 

lib/api.js

@@ -3,6 +3,7 @@ import bindings from 'bindings'
 
 const moduleRoot = bindings.getRoot(fileURLToPath(import.meta.url))
 export const {
+  _coverageFlush,
   _testAsync,
   Chain,
   Decoder,

src/index.cpp

@@ -5,6 +5,10 @@
 #include "mappings/native_iterator.hpp"
 #include <napi.h>
 
+#ifdef COVERAGE
+extern "C" void __gcov_dump(void);
+#endif
+
 namespace flac_bindings {
 
   using namespace Napi;
@@ -68,6 +72,15 @@ namespace flac_bindings {
         InstanceValue("Chain", initMetadata2Chain(env, *this), napi_enumerable),
         InstanceValue("Iterator", initMetadata2Iterator(env, *this), napi_enumerable),
         InstanceValue("fns", initFns(env), napi_enumerable),
+#ifdef COVERAGE
+        InstanceValue(
+          "_coverageFlush",
+          Function::New(env, [] (const CallbackInfo& info) {
+            __gcov_dump();
+            return info.Env().Undefined();
+          }, "_coverageFlush")
+        ),
+#endif
       });
 
     exports.Freeze();

test/helper/setup.js

@@ -1,5 +1,11 @@
 /* eslint-disable import-x/no-extraneous-dependencies */
 import * as matchers from 'jest-extended'
-import { expect } from 'vitest'
+import { afterAll, expect } from 'vitest'
 
 expect.extend(matchers)
+
+afterAll(async () => {
+  // force flush code coverage from C++ code
+  const { _coverageFlush } = await import('../../lib/api.js')
+  _coverageFlush?.()
+})