import assert from "assert"
import { toVLQ, fromVLQ } from "./vlq"

describe("MidiFileWriter", () => {
  it("should convert integer to VLQ", () => {
    assert.deepEqual(toVLQ(0x00000000), [0x00])
    assert.deepEqual(toVLQ(0x0000007F), [0x7F])
    assert.deepEqual(toVLQ(0x00000080), [0x81, 0x00])
    assert.deepEqual(toVLQ(0x00002000), [0xC0, 0x00])
    assert.deepEqual(toVLQ(0x00003FFF), [0xFF, 0x7F])
    assert.deepEqual(toVLQ(0x00004000), [0x81, 0x80, 0x00])
    assert.deepEqual(toVLQ(0x001FFFFF), [0xFF, 0xFF, 0x7F])
    assert.deepEqual(toVLQ(0x00200000), [0x81, 0x80, 0x80, 0x00])
    assert.deepEqual(toVLQ(0x08000000), [0xC0, 0x80, 0x80, 0x00])
    assert.deepEqual(toVLQ(0x0FFFFFFF), [0xFF, 0xFF, 0xFF, 0x7F])
  })

  it("should convert VLQ to integer", () => {
    assert.deepEqual(0x00000000, fromVLQ([0x00]))
    assert.deepEqual(0x0000007F, fromVLQ([0x7F]))
    assert.deepEqual(0x00000080, fromVLQ([0x81, 0x00]))
    assert.deepEqual(0x00002000, fromVLQ([0xC0, 0x00]))
    assert.deepEqual(0x00003FFF, fromVLQ([0xFF, 0x7F]))
    assert.deepEqual(0x00004000, fromVLQ([0x81, 0x80, 0x00]))
    assert.deepEqual(0x001FFFFF, fromVLQ([0xFF, 0xFF, 0x7F]))
    assert.deepEqual(0x00200000, fromVLQ([0x81, 0x80, 0x80, 0x00]))
    assert.deepEqual(0x08000000, fromVLQ([0xC0, 0x80, 0x80, 0x00]))
    assert.deepEqual(0x0FFFFFFF, fromVLQ([0xFF, 0xFF, 0xFF, 0x7F]))
  })
})