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test: adding history regression test case
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PR-URL: #24843
Refs: #24385
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
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antsmartian authored and BethGriggs committed Feb 12, 2019
1 parent dd2b553 commit 54d7e82
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139 changes: 139 additions & 0 deletions test/parallel/test-repl-history-navigation.js
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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');
const fs = require('fs');
const path = require('path');

const tmpdir = require('../common/tmpdir');
tmpdir.refresh();

const defaultHistoryPath = path.join(tmpdir.path, '.node_repl_history');

// Create an input stream specialized for testing an array of actions
class ActionStream extends stream.Stream {
run(data) {
const _iter = data[Symbol.iterator]();
const doAction = () => {
const next = _iter.next();
if (next.done) {
// Close the repl. Note that it must have a clean prompt to do so.
this.emit('keypress', '', { ctrl: true, name: 'd' });
return;
}
const action = next.value;

if (typeof action === 'object') {
this.emit('keypress', '', action);
} else {
this.emit('data', `${action}`);
}
setImmediate(doAction);
};
setImmediate(doAction);
}
resume() {}
pause() {}
}
ActionStream.prototype.readable = true;


// Mock keys
const ENTER = { name: 'enter' };
const UP = { name: 'up' };
const DOWN = { name: 'down' };

const prompt = '> ';

const tests = [
{ // creates few history to navigate for
env: { NODE_REPL_HISTORY: defaultHistoryPath },
test: [ 'let ab = 45', ENTER,
'555 + 909', ENTER,
'{key : {key2 :[] }}', ENTER],
expected: [],
clean: false
},
{
env: { NODE_REPL_HISTORY: defaultHistoryPath },
test: [UP, UP, UP, UP, DOWN, DOWN, DOWN],
expected: [prompt,
`${prompt}{key : {key2 :[] }}`,
`${prompt}555 + 909`,
`${prompt}let ab = 45`,
`${prompt}555 + 909`,
`${prompt}{key : {key2 :[] }}`,
prompt],
clean: true
}
];
const numtests = tests.length;

const runTestWrap = common.mustCall(runTest, numtests);

function cleanupTmpFile() {
try {
// Write over the file, clearing any history
fs.writeFileSync(defaultHistoryPath, '');
} catch (err) {
if (err.code === 'ENOENT') return true;
throw err;
}
return true;
}

function runTest() {
const opts = tests.shift();
if (!opts) return; // All done

const env = opts.env;
const test = opts.test;
const expected = opts.expected;

REPL.createInternalRepl(env, {
input: new ActionStream(),
output: new stream.Writable({
write(chunk, _, next) {
const output = chunk.toString();

if (output.charCodeAt(0) === 27 || /^[\r\n]+$/.test(output)) {
return next();
}

if (expected.length) {
assert.strictEqual(output, expected[0]);
expected.shift();
}

next();
}
}),
prompt: prompt,
useColors: false,
terminal: true
}, function(err, repl) {
if (err) {
console.error(`Failed test # ${numtests - tests.length}`);
throw err;
}

repl.once('close', () => {
if (opts.clean)
cleanupTmpFile();

if (expected.length !== 0) {
throw new Error(`Failed test # ${numtests - tests.length}`);
}
setImmediate(runTestWrap, true);
});

repl.inputStream.run(test);
});
}

// run the tests
runTest();

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