Add all BENNC message types with unit tests

tests/messages/packet.test.ts

@@ -0,0 +1,46 @@
+import { packOutgoingPacket, unpackIncomingPacket } from '../../src/messages/packet'
+
+test('Pack an outgoing packet.', () => {
+  // Given
+  const messageType = Buffer.from([0x12, 0x34])
+  const data = Buffer.from([0x12, 0x34, 0x56, 0x78])
+
+  // When
+  const packedPacket = packOutgoingPacket({
+    messageType: messageType,
+    data: data
+  })
+
+  // Then
+  const expectedResult = Buffer.from([
+    // Message type
+    0x12, 0x34,
+    // Data length
+    0x00, 0x04,
+    // Data
+    0x12, 0x34, 0x56, 0x78
+  ])
+  expect(packedPacket).toMatchObject(expectedResult)
+})
+
+test('Unpack an incoming packet.', () => {
+  // Given
+  const incomingPacket = Buffer.from([
+    // Message type
+    0x12, 0x34,
+    // Sender ID
+    0xaa, 0xbb, 0xcc, 0xdd,
+    // Data length
+    0x00, 0x04,
+    // Data
+    0x12, 0x34, 0x56, 0x78
+  ])
+
+  // When
+  const unpackedResult = unpackIncomingPacket(incomingPacket)
+
+  // Then
+  expect(unpackedResult.messageType).toBe(0x1234)
+  expect(unpackedResult.senderId).toBe(0xaabbccdd)
+  expect(unpackedResult.data).toMatchObject(Buffer.from([0x12, 0x34, 0x56, 0x78]))
+})