initial

test/compression.test.js

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+'use strict';
+
+const test = require('node:test');
+const assert = require('node:assert');
+const { MCStream } = require('../src/bot/compression');
+
+test('MCStream: deflate below threshold is passthrough', () => {
+  const s = new MCStream();
+  s.setThreshold(256);
+  const data = Buffer.from('hello');
+  assert.strictEqual(s.deflate(data), data);
+});
+
+test('MCStream: inflate of uncompressed data is passthrough', () => {
+  const s = new MCStream();
+  s.setThreshold(256);
+  const data = Buffer.from('hello');
+  assert.strictEqual(s.inflate(data), data);
+});
+
+test('MCStream: deflate then inflate round-trip', () => {
+  const s = new MCStream();
+  s.setThreshold(8);
+  const data = Buffer.from('a'.repeat(64));
+  const compressed = s.deflate(data);
+  assert.ok(compressed.length < data.length, 'compressed should be smaller');
+  const back = s.inflate(compressed);
+  assert.deepStrictEqual([...back], [...data]);
+});
+
+test('MCStream: corrupt zlib stream returns original', () => {
+  const s = new MCStream();
+  s.setThreshold(8);
+  const bad = Buffer.from('not a zlib stream at all - just bytes');
+  const result = s.inflate(bad);
+  assert.strictEqual(result, bad);
+});
+
+test('MCStream: disabled returns input as-is', () => {
+  const s = new MCStream();
+  assert.strictEqual(s.isEnabled(), false);
+  const data = Buffer.from('x'.repeat(1024));
+  assert.strictEqual(s.deflate(data), data);
+  assert.strictEqual(s.inflate(data), data);
+});