deno/std/bytes/test.ts

// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.

import { findIndex, findLastIndex, equal, hasPrefix, repeat } from "./mod.ts";
import { test } from "../testing/mod.ts";
import { assertEquals, assertThrows } from "../testing/asserts.ts";

test(function bytesfindIndex1(): void {
  const i = findIndex(
    new Uint8Array([1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 3]),
    new Uint8Array([0, 1, 2])
  );
  assertEquals(i, 2);
});

test(function bytesfindIndex2(): void {
  const i = findIndex(new Uint8Array([0, 0, 1]), new Uint8Array([0, 1]));
  assertEquals(i, 1);
});

test(function bytesfindLastIndex1(): void {
  const i = findLastIndex(
    new Uint8Array([0, 1, 2, 0, 1, 2, 0, 1, 3]),
    new Uint8Array([0, 1, 2])
  );
  assertEquals(i, 3);
});

test(function bytesfindLastIndex2(): void {
  const i = findLastIndex(new Uint8Array([0, 1, 1]), new Uint8Array([0, 1]));
  assertEquals(i, 0);
});

test(function bytesBytesequal(): void {
  const v = equal(new Uint8Array([0, 1, 2, 3]), new Uint8Array([0, 1, 2, 3]));
  assertEquals(v, true);
});

test(function byteshasPrefix(): void {
  const v = hasPrefix(new Uint8Array([0, 1, 2]), new Uint8Array([0, 1]));
  assertEquals(v, true);
});

test(function bytesrepeat(): void {
  // input / output / count / error message
  const repeatTestCase = [
    ["", "", 0],
    ["", "", 1],
    ["", "", 1.1, "bytes: repeat count must be an integer"],
    ["", "", 2],
    ["", "", 0],
    ["-", "", 0],
    ["-", "-", -1, "bytes: negative repeat count"],
    ["-", "----------", 10],
    ["abc ", "abc abc abc ", 3]
  ];
  for (const [input, output, count, errMsg] of repeatTestCase) {
    if (errMsg) {
      assertThrows(
        (): void => {
          repeat(new TextEncoder().encode(input as string), count as number);
        },
        Error,
        errMsg as string
      );
    } else {
      const newBytes = repeat(
        new TextEncoder().encode(input as string),
        count as number
      );

      assertEquals(new TextDecoder().decode(newBytes), output);
    }
  }
});