initial

test/codec.test.js

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+'use strict';
+
+const test = require('node:test');
+const assert = require('node:assert');
+const { parsePositionAndLook, parseChat, parseJoinGame } = require('../src/bot/codec');
+
+test('parsePositionAndLook: full payload', () => {
+  const data = Buffer.alloc(33);
+  data.writeDoubleLE(1.5, 0);
+  data.writeDoubleLE(64.0, 8);
+  data.writeDoubleLE(-3.25, 16);
+  data.writeFloatLE(45.0, 24);
+  data.writeFloatLE(15.0, 28);
+  data[32] = 0;
+  const r = parsePositionAndLook(data);
+  assert.ok(r);
+  assert.strictEqual(r.x, 1.5);
+  assert.strictEqual(r.y, 64.0);
+  assert.strictEqual(r.z, -3.25);
+  assert.strictEqual(r.yaw, 45.0);
+  assert.strictEqual(r.pitch, 15.0);
+});
+
+test('parsePositionAndLook: too short returns null', () => {
+  const data = Buffer.alloc(10);
+  assert.strictEqual(parsePositionAndLook(data), null);
+});
+
+test('parseChat: simple text', () => {
+  const json = JSON.stringify({ text: 'Hello world' });
+  const len = Buffer.byteLength(json);
+  const data = Buffer.concat([
+    Buffer.from([len]),
+    Buffer.from(json, 'utf8'),
+  ]);
+  const r = parseChat(data);
+  assert.strictEqual(r.text, 'Hello world');
+});
+
+test('parseChat: with translate', () => {
+  const json = JSON.stringify({ translate: 'commands.register.success', with: ['alice'] });
+  const data = Buffer.concat([
+    Buffer.from([Buffer.byteLength(json)]),
+    Buffer.from(json, 'utf8'),
+  ]);
+  const r = parseChat(data);
+  assert.strictEqual(r.translate, 'commands.register.success');
+  assert.ok(r.text.includes('commands.register.success'));
+});
+
+test('parseChat: strips color codes', () => {
+  const json = JSON.stringify({ text: '§aGreen§r text' });
+  const data = Buffer.concat([
+    Buffer.from([Buffer.byteLength(json)]),
+    Buffer.from(json, 'utf8'),
+  ]);
+  const r = parseChat(data);
+  assert.strictEqual(r.text, 'Green text');
+});
+
+test('parseJoinGame: minimal', () => {
+  const data = Buffer.alloc(10);
+  data[0] = 1;
+  data[1] = 0;
+  data.writeInt32BE(0, 2);
+  data[6] = 0;
+  data[7] = 20;
+  data[8] = 0;
+  const r = parseJoinGame(data);
+  assert.ok(r);
+  assert.strictEqual(r.entityId, 1);
+  assert.strictEqual(r.gamemode, 0);
+  assert.strictEqual(r.dimension, 0);
+  assert.strictEqual(r.maxPlayers, 20);
+});