Qfyilyi

I’ve been looking for the Spock equivalent of the following convenience method in JUnit whereby you can do “approximate” comparisons. Does anyone know if such a thing exists?

/**

 * Asserts that two doubles or floats are equal to within a positive delta.

 */

assertEquals(double expected, double actual, double delta) 

There is build in function for that, described in official docs:

when:

def x = computeValue()



then:

expect x, closeTo(42, 0.01)

Check the specs.

I don't know if there's a Spock equivalent but it's easy to write your own

class Foo extends Specification {



  private boolean compareApproximately(Number expected, Number actual, Number delta) {

    Math.abs(expected - actual) <= delta

  }



  def "approximate test"() {

    expect:

    compareApproximately(4, 4.5, 1)

    !compareApproximately(4, 4.5, 0.1)

  }

}

In practice, you'd probably want to make compareApproximately reusable across specs by defining it in a trait, subclass of Specification, or a static method in a utility class.