import { assertEquals } from "assert";
import { b } from "../helpers.ts";
import crc32 from "../../public/png/crc32.js";

Deno.test("computes CRC32s", () => {
  // These tests are lifted from the following Go 1.19.3 code:
  //
  // ```
  // crc := crc32.NewIEEE()
  // fmt.Println(crc.Sum32())
  // crc.Write([]byte{})
  // fmt.Println(crc.Sum32())
  // crc.Write([]byte{1, 2, 3})
  // fmt.Println(crc.Sum32())
  // crc.Write([]byte{4, 5, 6})
  // fmt.Println(crc.Sum32())
  // ```
  assertEquals(crc32(), 0);
  assertEquals(crc32(b(1, 2, 3)), 1438416925);
  assertEquals(crc32(b(1, 2, 3, 4, 5, 6)), 2180413220);
});