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test: expand test coverage of readline

PR-URL: #12755
Reviewed-By: Anna Henningsen <anna@addaleax.net>
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jasnell authored and addaleax committed Apr 30, 2017
1 parent 4c070d4 commit d37f27a00830f364f3375fed996ecb75e61f7f9b
Showing with 90 additions and 0 deletions.
  1. +90 −0 test/parallel/test-readline-csi.js
@@ -0,0 +1,90 @@
// Flags: --expose-internals
'use strict';

const common = require('../common');
const assert = require('assert');
const readline = require('readline');
const { Writable } = require('stream');
const { CSI } = require('internal/readline');

{
assert(CSI);
assert.strictEqual(CSI.kClearToBeginning, '\x1b[1K');
assert.strictEqual(CSI.kClearToEnd, '\x1b[0K');
assert.strictEqual(CSI.kClearLine, '\x1b[2K');
assert.strictEqual(CSI.kClearScreenDown, '\x1b[0J');
assert.strictEqual(CSI`1${2}3`, '\x1b[123');
}

class TestWritable extends Writable {
constructor() {
super();
this.data = '';
}
_write(chunk, encoding, callback) {
this.data += chunk.toString();
callback();
}
}

const writable = new TestWritable();

readline.clearScreenDown(writable);
assert.deepStrictEqual(writable.data, CSI.kClearScreenDown);

writable.data = '';
readline.clearLine(writable, -1);
assert.deepStrictEqual(writable.data, CSI.kClearToBeginning);

writable.data = '';
readline.clearLine(writable, 1);
assert.deepStrictEqual(writable.data, CSI.kClearToEnd);

writable.data = '';
readline.clearLine(writable, 0);
assert.deepStrictEqual(writable.data, CSI.kClearLine);

// Nothing is written when moveCursor 0, 0
[
[0, 0, ''],
[1, 0, '\x1b[1C'],
[-1, 0, '\x1b[1D'],
[0, 1, '\x1b[1B'],
[0, -1, '\x1b[1A'],
[1, 1, '\x1b[1C\x1b[1B'],
[-1, 1, '\x1b[1D\x1b[1B'],
[-1, -1, '\x1b[1D\x1b[1A'],
[1, -1, '\x1b[1C\x1b[1A'],
].forEach((set) => {
writable.data = '';
readline.moveCursor(writable, set[0], set[1]);
assert.deepStrictEqual(writable.data, set[2]);
});

assert.doesNotThrow(() => readline.cursorTo(null));
assert.doesNotThrow(() => readline.cursorTo());

writable.data = '';
assert.doesNotThrow(() => readline.cursorTo(writable, 'a'));
assert.strictEqual(writable.data, '');

writable.data = '';
assert.doesNotThrow(() => readline.cursorTo(writable, 'a', 'b'));
assert.strictEqual(writable.data, '');

writable.data = '';
assert.throws(
() => readline.cursorTo(writable, 'a', 1),
common.expectsError({
type: Error,
message: /^Can't set cursor row without also setting it's column$/
}));
assert.strictEqual(writable.data, '');

writable.data = '';
assert.doesNotThrow(() => readline.cursorTo(writable, 1, 'a'));
assert.strictEqual(writable.data, '\x1b[2G');

writable.data = '';
assert.doesNotThrow(() => readline.cursorTo(writable, 1, 2));
assert.strictEqual(writable.data, '\x1b[3;2H');

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