Method toContain

packages/expect/src/types.ts:214–214

* Used when you want to check that an item is in a list. * For testing the items in the list, this uses `===`, a strict equality check. * `.toContain` can also check whether a string is a substring of another string.

(expected: unknown)

   * `.toContain` can also check whether a string is a substring of another string.
   */
  toContain(expected: unknown): R;
  /**
   * Used when you want to check that an item is in a list.
   * For testing the items in the list, this  matcher recursively checks the