Initial progress

tests/bennc.test.ts

@@ -1,5 +0,0 @@
-import { addNumbers } from '../src/bennc'
-
-test('Add two numbers', () => {
-  expect(addNumbers(1, 2)).toBe(3)
-})

tests/buffer-reader.test.ts

@@ -0,0 +1,96 @@
+import { BufferReader } from '../src/buffer-reader'
+
+test('Read a UInt16.', () => {
+  // Given
+  const buffer = Buffer.from([0x30, 0x39])
+
+  // When
+  const smartBuffer = new BufferReader(buffer)
+
+  // Then
+  expect(smartBuffer.readUInt16()).toBe(12345)
+})
+
+test('Read a UInt32.', () => {
+  // Given
+  const buffer = Buffer.from([0x49, 0x96, 0x02, 0xD2])
+
+  // When
+  const smartBuffer = new BufferReader(buffer)
+
+  // Then
+  expect(smartBuffer.readUInt32()).toBe(1234567890)
+})
+
+test('Read a buffer.', () => {
+  // Given
+  const buffer = Buffer.from([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
+
+  // When
+  const smartBuffer = new BufferReader(buffer)
+
+  // Then
+  expect(smartBuffer.readBuffer(4)).toMatchObject(Buffer.from([0, 1, 2, 3]))
+})
+
+test('Cursor is correctly incremented after reading a UInt16.', () => {
+  // Given
+  const buffer = Buffer.from([0x30, 0x39, 0x1A, 0x85])
+
+  // When
+  const smartBuffer = new BufferReader(buffer)
+
+  // Then
+  expect(smartBuffer.readUInt16()).toBe(12345)
+  expect(smartBuffer.readUInt16()).toBe(6789)
+})
+
+test('Cursor is correctly incremented after reading a buffer.', () => {
+  // Given
+  const buffer = Buffer.from([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
+
+  // When
+  const smartBuffer = new BufferReader(buffer)
+
+  // Then
+  expect(smartBuffer.readBuffer(4)).toMatchObject(Buffer.from([0, 1, 2, 3]))
+  expect(smartBuffer.readBuffer(4)).toMatchObject(Buffer.from([4, 5, 6, 7]))
+})
+
+test('Cursor is correctly incremented after reading a UInt32.', () => {
+  // Given
+  const buffer = Buffer.from([0x49, 0x96, 0x02, 0xD2, 0x3A, 0xDE, 0x68, 0xB1])
+
+  // When
+  const smartBuffer = new BufferReader(buffer)
+
+  // Then
+  expect(smartBuffer.readUInt32()).toBe(1234567890)
+  expect(smartBuffer.readUInt32()).toBe(987654321)
+})
+
+test('Seek to position below 0 throws range error.', () => {
+  // Given
+  const buffer = Buffer.from([])
+
+  // When
+  const smartBuffer = new BufferReader(buffer)
+
+  // Then
+  expect(() => {
+    smartBuffer.cursor = -1
+  }).toThrow(RangeError)
+})
+
+test('Seek beyond buffer throws range error.', () => {
+  // Given
+  const buffer = Buffer.from([0, 1, 2, 3])
+
+  // When
+  const smartBuffer = new BufferReader(buffer)
+
+  // Then
+  expect(() => {
+    smartBuffer.cursor = 5
+  }).toThrow(RangeError)
+})