node/test/simple/test-child-process-fork.js

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var assert = require('assert');
var common = require('../common');
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var fork = require('child_process').fork;
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var n = fork(common.fixturesDir + '/child-process-spawn-node.js');
var messageCount = 0;
n.on('message', function(m) {
console.log('PARENT got message:', m);
assert.ok(m.foo);
messageCount++;
});
n.send({ hello: 'world' });
var childExitCode = -1;
n.on('exit', function(c) {
childExitCode = c;
});
process.on('exit', function() {
assert.ok(childExitCode == 0);
});