test: test syncrhnous methods of child_process in snapshot

These currently work in snapshot builder scripts. Asynchronous methods are not supported yet. PR-URL: #50943 Refs: #50924 Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: James M Snell <[email protected]>

Author: joyeecheung

test/fixtures/snapshot/child-process-sync.js

@@ -0,0 +1,25 @@
+'use strict';
+
+const{
+ setDeserializeMainFunction,
+ isBuildingSnapshot
+}=require('v8').startupSnapshot;
+
+functionspawn(){
+const{ spawnSync, execFileSync, execSync }=require('child_process');
+spawnSync(process.execPath,[__filename,'spawnSync'],{stdio: 'inherit'});
+execSync(`"${process.execPath}" "${__filename}" "execSync"`,{stdio: 'inherit'});
+execFileSync(process.execPath,[__filename,'execFileSync'],{stdio: 'inherit'});
+}
+
+if(process.argv[2]!==undefined){
+console.log('From child process',process.argv[2]);
+}else{
+spawn();
+}
+
+if(isBuildingSnapshot()){
+setDeserializeMainFunction(()=>{
+spawn();
+});
+}

test/parallel/test-snapshot-child-process-sync.js

@@ -0,0 +1,53 @@
+'use strict';
+
+// This tests that process.cwd() is accurate when
+// restoring state from a snapshot
+
+require('../common');
+const{ spawnSyncAndExitWithoutError }=require('../common/child_process');
+consttmpdir=require('../common/tmpdir');
+constfixtures=require('../common/fixtures');
+constassert=require('assert');
+
+tmpdir.refresh();
+constblobPath=tmpdir.resolve('snapshot.blob');
+constfile=fixtures.path('snapshot','child-process-sync.js');
+constexpected=[
+'From child process spawnSync',
+'From child process execSync',
+'From child process execFileSync',
+];
+
+{
+// Create the snapshot.
+spawnSyncAndExitWithoutError(process.execPath,[
+'--snapshot-blob',
+blobPath,
+'--build-snapshot',
+file,
+],{
+cwd: tmpdir.path,
+},{
+trim: true,
+stdout(output){
+assert.deepStrictEqual(output.split('\n'),expected);
+returntrue;
+}
+});
+}
+
+{
+spawnSyncAndExitWithoutError(process.execPath,[
+'--snapshot-blob',
+blobPath,
+file,
+],{
+cwd: tmpdir.path,
+},{
+trim: true,
+stdout(output){
+assert.deepStrictEqual(output.split('\n'),expected);
+returntrue;
+}
+});
+}