Merge coverage outputs.

Author: onurtemizkan

plugins/node/opentelemetry-instrumentation-generic-pool/package.json

@@ -6,11 +6,11 @@
   "types": "build/src/index.d.ts",
   "repository": "open-telemetry/opentelemetry-js-contrib",
   "scripts": {
-    "test": "npm run test-v2-v2.4 && npm run test-v2.4-v3 && npm run test-v3",
+    "test": "npm run test-v2-v2.4 && npm run test-v2.4-v3 && npm run test-v3 && nyc merge .nyc_output ./coverage/coverage-final.json",
     "test-v2-v2.4": "tav generic-pool 2.2.0 npm run test-run",
     "test-v2.4-v3": "tav generic-pool 2.5.4 npm run test-run",
     "test-v3": "tav generic-pool 3.9.0 npm run test-run",
-    "test-run": "nyc mocha 'test/**/*.ts'",
+    "test-run": "nyc --no-clean mocha 'test/**/*.ts'",
     "tdd": "yarn test-run -- --watch-extensions ts --watch",
     "clean": "rimraf build/*",
     "lint": "eslint . --ext .ts",