diff --git a/gulpfile.ts b/gulpfile.ts
index dac1421e..388a74f4 100644
--- a/gulpfile.ts
+++ b/gulpfile.ts
@@ -102,7 +102,7 @@ gulp.task('test.only', 'Run tests without rebuilding anything',
           ['js.core.test', 'native.test.only']);
 
 gulp.task('test', 'Run all tests', (callback) => {
-  runSequence('build', 'test.only', 'internal.test.test', callback);
+  runSequence('build', 'test.only', callback);
 });
 
 gulp.task('doc.gen', 'Generate documentation', ['native.core.doc.gen']);
diff --git a/package.json b/package.json
index e8d7a112..fb626214 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,6 @@
     "@types/node": "^8.0.32",
     "@types/pify": "^3.0.0",
     "@types/semver": "^5.5.0",
-    "coveralls": "^3.0.1",
     "del": "^3.0.0",
     "execa": "^0.8.0",
     "gulp": "^3.9.1",
@@ -36,11 +35,8 @@
     "mocha": "^3.5.3",
     "mocha-jenkins-reporter": "^0.3.9",
     "ncp": "^2.0.0",
-    "nyc": "^11.7.2",
     "pify": "^3.0.0",
-    "run-sequence": "^2.2.0",
     "semver": "^5.5.0",
-    "symlink": "^2.1.0",
     "through2": "^2.0.3",
     "ts-node": "^3.3.0",
     "tslint": "^5.5.0",
@@ -52,19 +48,8 @@
       "name": "Google Inc."
     }
   ],
-  "nyc": {
-    "include": [
-      "packages/grpc-health-check/health.js",
-      "packages/grpc-js-core/build/src/*",
-      "packages/grpc-native-core/index.js",
-      "packages/grpc-native-core/src/*.js",
-      "packages/grpc-protobufjs/build/src/*"
-    ],
-    "cache": true,
-    "all": true
-  },
-  "scripts": {
-    "test": "nyc gulp test",
-    "coverage": "nyc report --reporter=text-lcov | coveralls"
+  "dependencies": {
+    "run-sequence": "^2.2.0",
+    "symlink": "^2.1.0"
   }
 }
diff --git a/packages/grpc-js-core/src/channel.ts b/packages/grpc-js-core/src/channel.ts
index 40b5a93d..c03389d8 100644
--- a/packages/grpc-js-core/src/channel.ts
+++ b/packages/grpc-js-core/src/channel.ts
@@ -82,15 +82,6 @@ export interface Channel extends EventEmitter {
   /* tslint:enable:no-any */
 }
 
-/* This should be a real subchannel class that contains a ClientHttp2Session,
- * but for now this serves its purpose */
-type Http2SubChannel = http2.ClientHttp2Session & {
-  /* Count the number of currently active streams associated with the session.
-   * The purpose of this is to keep the session reffed if and only if there
-   * is at least one active stream */
-  streamCount?: number;
-};
-
 export class Http2Channel extends EventEmitter implements Channel {
   private readonly userAgent: string;
   private readonly target: url.URL;
@@ -100,7 +91,7 @@ export class Http2Channel extends EventEmitter implements Channel {
   private connecting: Promise<void>|null = null;
   /* For now, we have up to one subchannel, which will exist as long as we are
    * connecting or trying to connect */
-  private subChannel: Http2SubChannel|null = null;
+  private subChannel: http2.ClientHttp2Session|null = null;
   private filterStackFactory: FilterStackFactory;
 
   private subChannelConnectCallback: () => void = () => {};
@@ -169,7 +160,7 @@ export class Http2Channel extends EventEmitter implements Channel {
   }
 
   private startConnecting(): void {
-    let subChannel: Http2SubChannel;
+    let subChannel: http2.ClientHttp2Session;
     const secureContext = this.credentials.getSecureContext();
     if (secureContext === null) {
       subChannel = http2.connect(this.target);
@@ -269,25 +260,11 @@ export class Http2Channel extends EventEmitter implements Channel {
           headers[HTTP2_HEADER_PATH] = methodName;
           headers[HTTP2_HEADER_TE] = 'trailers';
           if (this.connectivityState === ConnectivityState.READY) {
-            const session: Http2SubChannel = this.subChannel!;
-            let http2Stream = session.request(headers);
-            /* This is a very ad-hoc reference counting scheme. This should be
-             * handled by a subchannel class */
-            session.ref();
-            if (!session.streamCount) {
-              session.streamCount = 0;
-            }
-            session.streamCount += 1;
-            http2Stream.on('close', () => {
-              if (!session.streamCount) {
-                session.streamCount = 0;
-              }
-              session.streamCount -= 1;
-              if (session.streamCount <= 0) {
-                session.unref();
-              }
-            });
-            stream.attachHttp2Stream(http2Stream);
+            const session: http2.ClientHttp2Session = this.subChannel!;
+            // Prevent the HTTP/2 session from keeping the process alive.
+            // Note: this function is only available in Node 9
+            session.unref();
+            stream.attachHttp2Stream(session.request(headers));
           } else {
             /* In this case, we lost the connection while finalizing
              * metadata. That should be very unusual */
diff --git a/packages/grpc-protobufjs/package.json b/packages/grpc-protobufjs/package.json
index 8890edb8..1ed26975 100644
--- a/packages/grpc-protobufjs/package.json
+++ b/packages/grpc-protobufjs/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@grpc/proto-loader",
-  "version": "0.2.0",
+  "version": "0.1.0",
   "author": "Google Inc.",
   "contributors": [
     {
@@ -47,8 +47,5 @@
     "clang-format": "^1.2.2",
     "gts": "^0.5.3",
     "typescript": "~2.7.2"
-  },
-  "engines": {
-    "node": ">=6"
   }
 }
diff --git a/run-tests.sh b/run-tests.sh
index 4484d40b..300a2527 100755
--- a/run-tests.sh
+++ b/run-tests.sh
@@ -39,25 +39,9 @@ npm install --unsafe-perm
 
 mkdir -p reports
 export JOBS=8
-export JUNIT_REPORT_STACK=1
-
-OS=$(uname)
-
-if [ "$OS" = "Linux" ]
-then
-  gsutil cp gs://grpc-testing-secrets/coveralls_credentials/grpc-node.rc /tmp
-  set +x
-  . /tmp/grpc-node.rc
-  set -x
-  export COVERALLS_REPO_TOKEN
-  export COVERALLS_SERVICE_NAME=Kokoro
-  export COVERALLS_SERVICE_JOB_ID=$KOKORO_BUILD_ID
-fi
 
 # TODO(mlumish): Add electron tests
 
-FAILED="false"
-
 for version in ${node_versions}
 do
   # Install and setup node for the version we want.
@@ -67,8 +51,6 @@ do
   nvm use $version
   set -ex
 
-  export JUNIT_REPORT_PATH="reports/node$version/"
-
   # https://github.com/mapbox/node-pre-gyp/issues/362
   npm install -g node-gyp
 
@@ -80,8 +62,8 @@ do
   ./node_modules/.bin/gulp clean.all
   ./node_modules/.bin/gulp setup
 
-  # npm test calls nyc gulp test
-  npm test || FAILED="true"
+  # Rebuild libraries and run tests.
+  JUNIT_REPORT_PATH="reports/node$version/" JUNIT_REPORT_STACK=1 ./node_modules/.bin/gulp test || FAILED="true"
 done
 
 set +ex
@@ -90,12 +72,7 @@ set -ex
 
 node merge_kokoro_logs.js
 
-if [ "$FAILED" = "true" ]
+if [ "$FAILED" != "" ]
 then
   exit 1
-else
-  if [ "$OS" = "Linux" ]
-  then
-    npm run coverage
-  fi
 fi
diff --git a/test/api/interop_sanity_test.js b/test/api/interop_sanity_test.js
index 0ff4c28b..1152b310 100644
--- a/test/api/interop_sanity_test.js
+++ b/test/api/interop_sanity_test.js
@@ -68,7 +68,7 @@ describe('Interop tests', function() {
 	  throw new Error(`Server exited with signal ${signal}`);
 	}
       }
-    });
+    })
   });
   after(function() {
     serverProcess.send({});
diff --git a/test/gulpfile.js b/test/gulpfile.js
index 2aa1c9c2..61ff1658 100644
--- a/test/gulpfile.js
+++ b/test/gulpfile.js
@@ -21,7 +21,6 @@ const mocha = require('gulp-mocha');
 const execa = require('execa');
 const path = require('path');
 const del = require('del');
-const semver = require('semver');
 const linkSync = require('../util').linkSync;
 
 // gulp-help monkeypatches tasks to have an additional description parameter
@@ -39,10 +38,6 @@ gulp.task('clean.all', 'Delete all files created by tasks', () => {});
 gulp.task('test', 'Run API-level tests', () => {
   // run mocha tests matching a glob with a pre-required fixture,
   // returning the associated gulp stream
-  if (!semver.satisfies(process.version, '>=9.4')) {
-    console.log(`Skipping cross-implementation tests for Node ${process.version}`);
-    return;
-  }
   const apiTestGlob = `${apiTestDir}/*.js`;
   const runTestsWithFixture = (server, client) => new Promise((resolve, reject) => {
     const fixture = `${server}_${client}`;
@@ -56,19 +51,12 @@ gulp.task('test', 'Run API-level tests', () => {
       .on('end', resolve)
       .on('error', reject);
   });
-  var runTestsArgPairs;
-  if (semver.satisfies(process.version, '>=9.4')) {
-    runTestsArgPairs = [
-      ['native', 'native'],
-      ['native', 'js'],
-      // ['js', 'native'],
-      // ['js', 'js']
-    ];
-  } else {
-    runTestsArgPairs = [
-      ['native', 'native']
-    ];
-  }
+  const runTestsArgPairs = [
+    ['native', 'native'],
+    ['native', 'js'],
+    // ['js', 'native'],
+    // ['js', 'js']
+  ];
   return runTestsArgPairs.reduce((previousPromise, argPair) => {
     return previousPromise.then(runTestsWithFixture.bind(null, argPair[0], argPair[1]));
   }, Promise.resolve());
diff --git a/test/interop/interop_client.js b/test/interop/interop_client.js
index 195ef8d4..fb6026e0 100644
--- a/test/interop/interop_client.js
+++ b/test/interop/interop_client.js
@@ -616,12 +616,8 @@ if (require.main === module) {
   };
   runTest(argv.server_host + ':' + argv.server_port, argv.server_host_override,
           argv.test_case, argv.use_tls === 'true', argv.use_test_ca === 'true',
-          function (err) {
-            if (err) {
-              throw err;
-            } else {
-              console.log('OK:', argv.test_case);
-            }
+          function () {
+            console.log('OK:', argv.test_case);
           }, extra_args);
 }