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'use strict';
// Flags: --expose-internals
const common = require('../common');
const stream = require('stream');
const repl = require('internal/repl');
const assert = require('assert');
// Array of [useGlobal, expectedResult] pairs
const globalTestCases = [
[false, 'undefined'],
[true, '\'tacos\''],
[undefined, 'undefined']
];
const globalTest = (useGlobal, cb, output) => (err, repl) => {
if (err)
return cb(err);
let str = '';
output.on('data', (data) => (str += data));
global.lunch = 'tacos';
repl.write('global.lunch;\n');
repl.close();
delete global.lunch;
cb(null, str.trim());
};
// Test how the global object behaves in each state for useGlobal
for (const [option, expected] of globalTestCases) {
runRepl(option, globalTest, common.mustCall((err, output) => {
assert.ifError(err);
assert.strictEqual(output, expected);
}));
}
// Test how shadowing the process object via `let`
// behaves in each useGlobal state. Note: we can't
// actually test the state when useGlobal is true,
// because the exception that's generated is caught
// (see below), but errors are printed, and the test
// suite is aware of it, causing a failure to be flagged.
//
const processTestCases = [false, undefined];
const processTest = (useGlobal, cb, output) => (err, repl) => {
if (err)
return cb(err);
let str = '';
output.on('data', (data) => (str += data));
// If useGlobal is false, then `let process` should work
repl.write('let process;\n');
repl.write('21 * 2;\n');
repl.close();
cb(null, str.trim());
};
for (const option of processTestCases) {
runRepl(option, processTest, common.mustCall((err, output) => {
assert.ifError(err);
assert.strictEqual(output, 'undefined\n42');
}));
}
function runRepl(useGlobal, testFunc, cb) {
const inputStream = new stream.PassThrough();
const outputStream = new stream.PassThrough();
const opts = {
input: inputStream,
output: outputStream,
useGlobal: useGlobal,
useColors: false,
terminal: false,
prompt: ''
};
repl.createInternalRepl(
process.env,
opts,
testFunc(useGlobal, cb, opts.output));
}