Function empty

io/buffer_test.ts:60–75

(
  buf: Buffer,
  s: string,
  fub: Uint8Array,
)

// Empty buf through repeated reads into fub.
// The initial contents of buf corresponds to the string s.
async function empty(
  buf: Buffer,
  s: string,
  fub: Uint8Array,
) {
  check(buf, s);
  while (true) {
    const r = await buf.read(fub);
    if (r === null) {
      break;
    }
    s = s.slice(r);
    check(buf, s);
  }
  check(buf, "");
}

function repeat(c: string, bytes: number): Uint8Array {
  assertEquals(c.length, 1);