bennc/tests/utilities/smart-buffer.test.ts

import { SmartBuffer } from "../../src/utilities/smart-buffer";

test("Read a UInt16.", () => {
  // Given
  const buffer = [0x30, 0x39];

  // When
  const smartBuffer = SmartBuffer.from(buffer);

  // Then
  expect(smartBuffer.readUInt16()).toBe(12345);
});

test("Read a UInt32.", () => {
  // Given
  const buffer = [0x49, 0x96, 0x02, 0xd2];

  // When
  const smartBuffer = SmartBuffer.from(buffer);

  // Then
  expect(smartBuffer.readUInt32()).toBe(1234567890);
});

test("Read a buffer.", () => {
  // Given
  const buffer = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];

  // When
  const smartBuffer = SmartBuffer.from(buffer);

  // Then
  const result = smartBuffer.readBytes(4);
  expect(result).toMatchObject(new Uint8Array([0, 1, 2, 3]));
});

test("Read a UInt16 from an offset.", () => {
  // Given
  const buffer = [0x00, 0x00, 0x30, 0x39];

  // When
  const smartBuffer = SmartBuffer.from(buffer);
  smartBuffer.cursor = 2;

  // Then
  expect(smartBuffer.readUInt16()).toBe(12345);
});

test("Read a UInt32 from an offset.", () => {
  // Given
  const buffer = [0x00, 0x00, 0x49, 0x96, 0x02, 0xd2];

  // When
  const smartBuffer = SmartBuffer.from(buffer);
  smartBuffer.cursor = 2;

  // Then
  expect(smartBuffer.readUInt32()).toBe(1234567890);
});

test("Read a buffer from an offset.", () => {
  // Given
  const buffer = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];

  // When
  const smartBuffer = SmartBuffer.from(buffer);
  smartBuffer.cursor = 2;

  // Then
  expect(smartBuffer.readBytes(4)).toMatchObject(new Uint8Array([2, 3, 4, 5]));
});

test("Write a UInt16.", () => {
  // Given
  const smartBuffer = new SmartBuffer();

  // When
  smartBuffer.writeUInt16(12345);

  // Then
  expect(smartBuffer.data).toMatchObject(new Uint8Array([0x30, 0x39]));
});

test("Write a UInt32.", () => {
  // Given
  const smartBuffer = new SmartBuffer();

  // When
  smartBuffer.writeUInt32(1234567890);

  // Then
  expect(smartBuffer.data).toMatchObject(
    new Uint8Array([0x49, 0x96, 0x02, 0xd2]),
  );
});

test("Write a buffer.", () => {
  // Given
  const smartBuffer = new SmartBuffer();

  // When
  smartBuffer.writeBytes([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);

  // Then
  expect(smartBuffer.data).toMatchObject(
    new Uint8Array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]),
  );
});

test("Write a UInt16 at an offset.", () => {
  // Given
  const smartBuffer = new SmartBuffer();

  // When
  smartBuffer.cursor = 2;
  smartBuffer.writeUInt16(12345);

  // Then
  expect(smartBuffer.data).toMatchObject(
    new Uint8Array([0x00, 0x00, 0x30, 0x39]),
  );
});

test("Write a UInt32 at an offset.", () => {
  // Given
  const smartBuffer = new SmartBuffer();

  // When
  smartBuffer.cursor = 2;
  smartBuffer.writeUInt32(1234567890);

  // Then
  expect(smartBuffer.data).toMatchObject(
    new Uint8Array([0x00, 0x00, 0x49, 0x96, 0x02, 0xd2]),
  );
});

test("Write a buffer at an offset.", () => {
  // Given
  const smartBuffer = new SmartBuffer();

  // When
  smartBuffer.cursor = 2;
  smartBuffer.writeBytes([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);

  // Then
  expect(smartBuffer.data).toMatchObject(
    new Uint8Array([0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9]),
  );
});

test("Cursor is correctly incremented after reading a UInt16.", () => {
  // Given
  const buffer = new Uint8Array(4);

  // When
  const smartBuffer = SmartBuffer.from(buffer);

  // Then
  smartBuffer.readUInt16();
  expect(smartBuffer.cursor).toBe(2);
});

test("Cursor is correctly incremented after reading a UInt32.", () => {
  // Given
  const buffer = new Uint8Array(4);

  // When
  const smartBuffer = SmartBuffer.from(buffer);

  // Then
  smartBuffer.readUInt32();
  expect(smartBuffer.cursor).toBe(4);
});

test("Cursor is correctly incremented after reading a buffer.", () => {
  // Given
  const buffer = new Uint8Array(8);

  // When
  const smartBuffer = SmartBuffer.from(buffer);

  // Then
  smartBuffer.readBytes(4);
  expect(smartBuffer.cursor).toBe(4);
});

test("Cursor is correctly incremented after writing a UInt16.", () => {
  // Given
  const smartBuffer = new SmartBuffer();

  // When
  smartBuffer.writeUInt16(12345);

  // Then
  expect(smartBuffer.cursor).toBe(2);
});

test("Cursor is correctly incremented after writing a UInt32.", () => {
  // Given
  const smartBuffer = new SmartBuffer();

  // When
  smartBuffer.writeUInt32(1234567890);

  // Then
  expect(smartBuffer.cursor).toBe(4);
});

test("Cursor is correctly incremented after writing a buffer.", () => {
  // Given
  const smartBuffer = new SmartBuffer();

  // When
  smartBuffer.writeBytes([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);

  // Then
  expect(smartBuffer.cursor).toBe(10);
});

test("Seek to position below 0 throws range error.", () => {
  // When
  const smartBuffer = new SmartBuffer();

  // Then
  expect(() => {
    smartBuffer.cursor = -1;
  }).toThrow(RangeError);
});

test("Pad some data.", () => {
  // Given
  const smartBuffer = new SmartBuffer();

  // When
  smartBuffer.pad(10);

  // Then
  expect(smartBuffer.length).toBe(10);
});