Spock Metaprogramming getProperty()

Question

I'd like to override the getProperty() method in a Spock test, per the documentation of get/setProperty. This is trivial in a normal Groovy class, but doesn't seem to work inside a Spock specification.

class MainSpec extends Specification {
    @Override
    def getProperty(String name) {
        def value = metaClass.getProperty(this, name)
        println "$name == $value"
        return value
    }

    String foo = 'foo'

    def test() {
        expect:
        foo
        println foo
    }
}

This example does not invoke the getProperty() method. It appears Spock is bypassing it somehow. Is there a way to hook into Spock's property resolution mechanism, or tell Spock to use my overridden method?

Answer 1

It turns out that moving the property to a parent class is sufficient to make it pass through the getProperty() interceptor, even when the parent is another Specification class.

class BaseSpec extends Specification {
    def foo = 'foo'
}

class MainSpec extends BaseSpec {
    @Override
    def getProperty(String name) {
        def value = super.getProperty(name)
        println "$name == $value"
        return value
    }

    def test() {
        expect:
        foo
        println foo
    }
}