test/parallel/test-fs-readfile-pipe.js

// Copyright Joyent, Inc. and other Node contributors.
//
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// following conditions:
//
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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'use strict';
const common = require('../common');

// Simulate `cat readfile.js | node readfile.js`

if (common.isWindows || common.isAIX)
  common.skip(`No /dev/stdin on ${process.platform}.`);

const assert = require('assert');
const fs = require('fs');

if (process.argv[2] === 'child') {
  fs.readFile('/dev/stdin', common.mustCall(function(er, data) {
    assert.ifError(er);
    process.stdout.write(data);
  }));
  return;
}

const fixtures = require('../common/fixtures');

const filename = fixtures.path('readfile_pipe_test.txt');
const dataExpected = fs.readFileSync(filename).toString();

const exec = require('child_process').exec;
const f = JSON.stringify(__filename);
const node = JSON.stringify(process.execPath);
const cmd = `cat ${filename} | ${node} ${f} child`;
exec(cmd, common.mustCall(function(err, stdout, stderr) {
  assert.ifError(err);
  assert.strictEqual(
    stdout,
    dataExpected,
    `expected to read: '${dataExpected}' but got: '${stdout}'`);
  assert.strictEqual(
    stderr,
    '',
    `expected not to read anything from stderr but got: '${stderr}'`);
  console.log('ok');
}));