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DynamicBufferView.spec.mjs
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import {assert} from './test-util-core.mjs'
import {Ranges, DynamicBufferView} from '../src/util/DynamicBufferView.mjs'
describe('DynamicBufferView', () => {
/*
it(`.append() extends the view`, async () => {
let view = new DynamicBufferView(new Uint8Array([0,1,2]))
assert.equal(view.byteLength, 3)
let nextChunk = Uint8Array.from([3,4,5])
view.append(nextChunk)
assert.equal(view.byteLength, 6)
assert.equal(view.getUint8(2), 2)
assert.equal(view.getUint8(3), 3)
assert.equal(view.getUint8(5), 5)
})
*/
it(`.subarray(number, number, true) extends the buffer if needed`, async () => {
let view = new DynamicBufferView(new Uint8Array([0,1,2]))
assert.equal(view.byteLength, 3)
view.subarray(4, 3, true)
assert.equal(view.byteLength, 7)
})
describe('.set()', () => {
it(`extends the buffer if needed`, async () => {
let view = new DynamicBufferView(new Uint8Array([0,1,2]))
assert.equal(view.byteLength, 3)
view.set(new Uint8Array([4,5,6]), 4, true)
assert.equal(view.byteLength, 7)
assert.equal(view.getUint8(0), 0)
assert.equal(view.getUint8(2), 2)
// value at 3 is random deallocated data
assert.equal(view.getUint8(4), 4)
assert.equal(view.getUint8(6), 6)
})
it(`accepts ArrayBuffer`, async () => {
let view = new DynamicBufferView(new Uint8Array([0,1,2]))
assert.equal(view.byteLength, 3)
let uint8 = new Uint8Array([4,5,6])
let arrayBuffer = uint8.buffer
view.set(arrayBuffer, 4, true)
assert.equal(view.byteLength, 7)
assert.equal(view.getUint8(0), 0)
assert.equal(view.getUint8(2), 2)
// value at 3 is random deallocated data
assert.equal(view.getUint8(4), 4)
assert.equal(view.getUint8(6), 6)
})
it(`returns BufferView chunk of the extended view, sharing the same memory`, async () => {
let view = new DynamicBufferView(new Uint8Array([0,1,2]))
assert.equal(view.byteLength, 3)
let uint8 = new Uint8Array([4,5,6])
let arrayBuffer = uint8.buffer
let chunk = view.set(arrayBuffer, 4, true)
assert.equal(chunk.getUint8(0), 4)
assert.equal(chunk.getUint8(2), 6)
let newVal1 = 98
let newVal2 = 99
chunk.dataView.setUint8(0, newVal1)
view.dataView.setUint8(5, newVal2)
assert.equal(chunk.getUint8(0), newVal1)
assert.equal(view.getUint8(4), newVal1)
assert.equal(chunk.getUint8(1), newVal2)
assert.equal(view.getUint8(5), newVal2)
})
})
})
describe('Ranges class', () => {
describe('.add()', () => {
it(`by default contains only has one range spanning input's whole size`, async () => {
let ranges = new Ranges
ranges.add(0, 5)
assert.isArray(ranges.list)
assert.equal(ranges.list.length, 1)
assert.equal(ranges.list[0].offset, 0)
assert.equal(ranges.list[0].length, 5)
assert.equal(ranges.list[0].end, 5)
})
it(`[0-5, 0-10] => [0-10] overlap extends existing range`, async () => {
let ranges = new Ranges
ranges.add(0, 5)
ranges.add(0, 10)
assert.equal(ranges.list.length, 1)
assert.equal(ranges.list[0].offset, 0)
assert.equal(ranges.list[0].length, 10)
assert.equal(ranges.list[0].end, 10)
})
it(`[0-5, 3-10] => [0-13] overlap extends existing range`, async () => {
let ranges = new Ranges
ranges.add(0, 5)
ranges.add(3, 10)
assert.equal(ranges.list.length, 1)
assert.equal(ranges.list[0].offset, 0)
assert.equal(ranges.list[0].length, 13)
assert.equal(ranges.list[0].end, 13)
})
it(`[0-5, 5-15] => [0-15] adjacing extends existing range`, async () => {
let ranges = new Ranges
ranges.add(0, 5)
ranges.add(5, 10)
assert.equal(ranges.list.length, 1)
assert.equal(ranges.list[0].offset, 0)
assert.equal(ranges.list[0].length, 15)
assert.equal(ranges.list[0].end, 15)
})
it(`[0-5, 10-20] => [0-5, 10-20] distant chunk creates new range with gap between`, async () => {
let ranges = new Ranges
ranges.add(0, 5)
ranges.add(10, 10)
assert.equal(ranges.list.length, 2)
assert.equal(ranges.list[0].offset, 0)
assert.equal(ranges.list[0].length, 5)
assert.equal(ranges.list[0].end, 5)
assert.equal(ranges.list[1].offset, 10)
assert.equal(ranges.list[1].length, 10)
assert.equal(ranges.list[1].end, 20)
})
it(`[0-5, 10-20, 2-8] => [0-8, 10-20] overlap & distant chunk combined`, async () => {
let ranges = new Ranges
ranges.add(0, 5)
ranges.add(10, 10)
ranges.add(2, 6)
assert.equal(ranges.list.length, 2)
assert.equal(ranges.list[0].offset, 0)
assert.equal(ranges.list[0].length, 8)
assert.equal(ranges.list[0].end, 8)
assert.equal(ranges.list[1].offset, 10)
assert.equal(ranges.list[1].length, 10)
assert.equal(ranges.list[1].end, 20)
})
it(`[0-5, 2-8, 10-20] => [0-8, 10-20] overlap & distant chunk combined`, async () => {
let ranges = new Ranges
ranges.add(0, 5)
ranges.add(2, 6)
ranges.add(10, 10)
assert.equal(ranges.list.length, 2)
assert.equal(ranges.list[0].offset, 0)
assert.equal(ranges.list[0].length, 8)
assert.equal(ranges.list[0].end, 8)
assert.equal(ranges.list[1].offset, 10)
assert.equal(ranges.list[1].length, 10)
assert.equal(ranges.list[1].end, 20)
})
it(`[0-5, 5-10, 10-15] => [0-15] removing gap combines adjacent ranges`, () => {
let ranges = new Ranges
ranges.add(0, 5)
ranges.add(5, 5)
ranges.add(10, 5)
assert.equal(ranges.list.length, 1)
assert.equal(ranges.list[0].offset, 0)
assert.equal(ranges.list[0].length, 15)
assert.equal(ranges.list[0].end, 15)
})
it(`[0-5, 10-15, 5-10] => [0-15] removing gap combines adjacent ranges`, () => {
let ranges = new Ranges
ranges.add(0, 5)
ranges.add(10, 5)
ranges.add(5, 5)
assert.equal(ranges.list.length, 1)
assert.equal(ranges.list[0].offset, 0)
assert.equal(ranges.list[0].length, 15)
assert.equal(ranges.list[0].end, 15)
})
// TODO: add append tests
})
describe('.available()', () => {
it(`[0-5] / 1-4 => true`, () => {
let ranges = new Ranges
ranges.add(0, 5)
assert.isTrue(ranges.available(1, 4))
})
it(`[0-5] / 0-3 => true`, () => {
let ranges = new Ranges
ranges.add(0, 5)
assert.isTrue(ranges.available(0, 3))
})
it(`[0-5] / 2-5 => true`, () => {
let ranges = new Ranges
ranges.add(0, 5)
assert.isTrue(ranges.available(2, 3))
})
it(`[0-5] / 0-5 => true`, () => {
let ranges = new Ranges
ranges.add(0, 5)
assert.isTrue(ranges.available(0, 5))
})
it(`[0-5] / 0-6 => false`, () => {
let ranges = new Ranges
ranges.add(0, 5)
assert.isFalse(ranges.available(0, 6))
})
it(`[0-5] / 4-8 => false`, () => {
let ranges = new Ranges
ranges.add(0, 5)
assert.isFalse(ranges.available(4, 4))
})
it(`[0-5] / 5-7 => false`, () => {
let ranges = new Ranges
ranges.add(0, 5)
assert.isFalse(ranges.available(5, 2))
})
it(`[0-5, 10-15] / 7-12 => false`, () => {
let ranges = new Ranges
ranges.add(0, 5)
ranges.add(10, 5)
assert.isFalse(ranges.available(7, 5))
})
it(`[0-5, 5-10, 10-15] / 7-12 => true`, () => {
let ranges = new Ranges
ranges.add(0, 5)
ranges.add(5, 5)
ranges.add(10, 5)
assert.isTrue(ranges.available(7, 5))
})
})
})