node/test/parallel/test-stdout-to-file.js
cjihrig 19907c27a6
test: use mustCall() for simple flow tracking
Many of the tests use variables to track when callback functions
are invoked or events are emitted. These variables are then
asserted on process exit. This commit replaces this pattern in
straightforward cases with common.mustCall(). This makes the
tests easier to reason about, leads to a net reduction in lines
of code, and uncovered a few bugs in tests. This commit also
replaces some callbacks that should never be called with
common.fail().

PR-URL: https://github.com/nodejs/node/pull/7753
Reviewed-By: Wyatt Preul <wpreul@gmail.com>
Reviewed-By: Minwoo Jung <jmwsoft@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
2017-01-31 20:04:31 -05:00

51 lines
1.3 KiB
JavaScript

'use strict';
const common = require('../common');
const assert = require('assert');
const path = require('path');
const childProcess = require('child_process');
const fs = require('fs');
const scriptString = path.join(common.fixturesDir, 'print-chars.js');
const scriptBuffer = path.join(common.fixturesDir,
'print-chars-from-buffer.js');
const tmpFile = path.join(common.tmpDir, 'stdout.txt');
common.refreshTmpDir();
function test(size, useBuffer, cb) {
var cmd = '"' + process.argv[0] + '"' +
' ' +
'"' + (useBuffer ? scriptBuffer : scriptString) + '"' +
' ' +
size +
' > ' +
'"' + tmpFile + '"';
try {
fs.unlinkSync(tmpFile);
} catch (e) {}
console.log(`${size} chars to ${tmpFile}...`);
childProcess.exec(cmd, common.mustCall(function(err) {
if (err) throw err;
console.log('done!');
var stat = fs.statSync(tmpFile);
console.log(`${tmpFile} has ${stat.size} bytes`);
assert.strictEqual(size, stat.size);
fs.unlinkSync(tmpFile);
cb();
}));
}
test(1024 * 1024, false, common.mustCall(function() {
console.log('Done printing with string');
test(1024 * 1024, true, common.mustCall(function() {
console.log('Done printing with buffer');
}));
}));