test(json-pack): 💍 add automated Bencode tests

Author: streamich

src/json-pack/bencode/__tests__/automated.spec.ts

@@ -0,0 +1,42 @@
+import {Writer} from '../../../util/buffers/Writer';
+import {BencodeEncoder} from '../BencodeEncoder';
+import {BencodeDecoder} from '../BencodeDecoder';
+import {utf8} from '../../../util/buffers/strings';
+
+const writer = new Writer(8);
+const encoder = new BencodeEncoder(writer);
+const decoder = new BencodeDecoder();
+
+const documents: [value: unknown, name?: string][] = [
+  [0],
+  [1],
+  [12345],
+  [-12345],
+  [-4444444444444444],
+  [true],
+  [false],
+  [null],
+  [undefined],
+  [utf8``, 'empty byte string'],
+  [utf8`hello`, '"hello" byte string'],
+  [{}, 'empty object'],
+  [[], 'empty array'],
+  [[1, -2, null, true, utf8`asdf`, false, utf8``, undefined], 'array with basic values'],
+  [[[[]]], 'triply nested arrays'],
+  [[1, [1, [1], 1], 1], 'nested arrays with values'],
+  [{a: {b: {c: {d: {foo: utf8`bar`}}}}}, 'nested objects'],
+];
+
+const assertEncoder = (value: unknown) => {
+  const encoded = encoder.encode(value);
+  const decoded = decoder.decode(encoded);
+  expect(decoded).toEqual(value);
+};
+
+describe('Sample JSON documents', () => {
+  for (const [value, name] of documents) {
+    test(name || String(value), () => {
+      assertEncoder(value);
+    });
+  }
+});