function toBeLessThan() {
      return {
        compare: function (actual, expected) {
          return {
            pass: actual < expected,
          };
        },
      };
    }
{@link expect} the actual value to be less than the expected value.
@function
@name matchers#toBeLessThan
@since 2.0.0
@param {Number} expected - The expected value to compare against.
@example
expect(result).toBeLessThan(0);