title: What does it mean by _._ in Groovy/Spock
body: <p>I have seen <code>_._</code> in the source code of a few Spock Specs. Does anyone know what that means?</p>
  
  <p>For example,</p>
  
  <pre><code>def "test something"() {
      given:
      someClass = Mock(SomeClass)
  
      and:
      1 * someClass.someMethod() &gt;&gt; returnSomething
      0 * _._
  
      when:
      String str = someClass.someMethod().toString()
  
      then:
      str == 'returnedValue'
  }
  </code></pre>