std/expect/_to_contain_test.ts

// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.

import { expect } from "./expect.ts";
import { AssertionError, assertThrows } from "@std/assert";

Deno.test("expect().toContain()", () => {
  const arr = [1, 2, 3];

  expect(arr).toContain(2);
  expect("foobarbaz").toContain("bar");

  expect(arr).not.toContain(4);
  expect("foobarbaz").not.toContain("qux");

  assertThrows(() => {
    expect(arr).toContain(4);
  }, AssertionError);
  assertThrows(
    () => {
      expect("foobarbaz").toContain("qux");
    },
    AssertionError,
    `The value "foobarbaz" doesn't contain the expected item "qux"`,
  );

  assertThrows(() => {
    expect(arr).not.toContain(2);
  }, AssertionError);
  assertThrows(
    () => {
      expect("foobarbaz").not.toContain("bar");
    },
    AssertionError,
    'The value "foobarbaz" contains the expected item "bar"',
  );
});