function toContain(matchersUtil) {
      return {
        compare: function (actual, expected) {
          return {
            pass: matchersUtil.contains(actual, expected),
          };
        },
      };
    }
{@link expect} the actual value to contain a specific value.
@function
@name matchers#toContain
@since 2.0.0
@param {Object} expected - The value to look for.
@example
expect(array).toContain(anElement);
expect(string).toContain(substring);