test: pass process.env to child processes

For variables such as LD_LIBRARY_PATH and DYLD_LIBRARY_PATH that are
needed for dynamically linked binaries

PR-URL: #16405
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>

benchmark/_http-benchmarkers.js

@@ -91,11 +91,9 @@ class TestDoubleBenchmarker {
   create(options) {
     const child = child_process.fork(this.executable, {
       silent: true,
-      env: {
-        duration: options.duration,
-        connections: options.connections,
-        path: `http://127.0.0.1:${options.port}${options.path}`
-      }
+      env: Object.assign({}, process.env, {
+        test_url: `http://127.0.0.1:${options.port}${options.path}`
+      })
     });
     return child;
   }

benchmark/_test-double-benchmarker.js

@@ -2,6 +2,6 @@
 
 const http = require('http');
 
-http.get(process.env.path, function() {
+http.get(process.env.test_url, function() {
   console.log(JSON.stringify({ throughput: 1 }));
 });

test/parallel/test-child-process-fork-no-shell.js

@@ -8,7 +8,7 @@ const expected = common.isWindows ? '%foo%' : '$foo';
 if (process.argv[2] === undefined) {
   const child = cp.fork(__filename, [expected], {
     shell: true,
-    env: { foo: 'bar' }
+    env: Object.assign({}, process.env, { foo: 'bar' })
   });
 
   child.on('exit', common.mustCall((code, signal) => {

test/sequential/test-inspector-port-cluster.js

@@ -311,11 +311,11 @@ function workerProcessMain() {
 function spawnMaster({ execArgv, workers, clusterSettings = {} }) {
   return new Promise((resolve) => {
     childProcess.fork(__filename, {
-      env: {
+      env: Object.assign({}, process.env, {
         workers: JSON.stringify(workers),
         clusterSettings: JSON.stringify(clusterSettings),
         testProcess: true
-      },
+      }),
       execArgv
     }).on('exit', common.mustCall((code, signal) => {
       checkExitCode(code, signal);