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test_child_process_stream_setencoding.cjs
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test_child_process_stream_setencoding.cjs
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const { spawn } = require('child_process');
function assert(condition, message) {
if (!condition) throw new Error(message);
}
const child = spawn(process.execPath, [
'-e',
'process.stdout.write("OUT"); process.stderr.write("ERR");'
]);
assert(child.stdout && typeof child.stdout.setEncoding === 'function', 'child.stdout.setEncoding should exist');
assert(child.stderr && typeof child.stderr.setEncoding === 'function', 'child.stderr.setEncoding should exist');
assert(child.stdout.readableEncoding === null, 'stdout readableEncoding should start as null');
assert(child.stderr.readableEncoding === null, 'stderr readableEncoding should start as null');
assert(child.stdout.setEncoding('utf8') === child.stdout, 'stdout.setEncoding should return stdout');
assert(child.stderr.setEncoding('utf8') === child.stderr, 'stderr.setEncoding should return stderr');
assert(child.stdout.readableEncoding === 'utf8', 'stdout readableEncoding should be utf8');
assert(child.stderr.readableEncoding === 'utf8', 'stderr readableEncoding should be utf8');
let stdout = '';
let stderr = '';
child.stdout.on('data', chunk => {
assert(typeof chunk === 'string', 'stdout data should be a string after setEncoding');
stdout += chunk;
});
child.stderr.on('data', chunk => {
assert(typeof chunk === 'string', 'stderr data should be a string after setEncoding');
stderr += chunk;
});
child.on('close', code => {
assert(code === 0, `child exited ${code}`);
assert(stdout === 'OUT', `expected stdout OUT, got ${JSON.stringify(stdout)}`);
assert(stderr === 'ERR', `expected stderr ERR, got ${JSON.stringify(stderr)}`);
console.log('child process stream setEncoding ok');
});

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test_child_process_stream_setencoding.cjs (1 KB)

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