Add all BENNC message types with unit tests

tests/utilities/number.test.ts

@@ -0,0 +1,19 @@
+import { numberToUint16BE, numberToUint32BE } from '../../src/utilities/number'
+
+test('Test number conversion to Uint16 big endian buffer.', () => {
+  // When
+  const result = numberToUint16BE(1234)
+
+  // Then
+  const expectedResult = Buffer.from([0x04, 0xd2])
+  expect(result).toMatchObject(expectedResult)
+})
+
+test('Test number conversion to Uint32 big endian buffer.', () => {
+  // When
+  const result = numberToUint32BE(123456)
+
+  // Then
+  const expectedResult = Buffer.from([0x00, 0x01, 0xE2, 0x40])
+  expect(result).toMatchObject(expectedResult)
+})