[GROOVY-7500] Problem With Runtime Metaprogramming Over A Trait Method

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.3
• Fix Version/s: 4.0.0-rc-2
• Assignee: Eric Milles
• Reporter: Jeff Scott Brown
• Created: 11/Jul/15 19:35
• Updated: 03/Feb/22 22:29
• Resolved: 19/Dec/21 19:06

Description

It looks like I cannot runtime metaprogram over a trait method.

The attached metaprogramovertrait.zip file contains the following:

src/main/groovy/demo/SomeClass.groovy

package demo

class SomeClass implements SomeTrait {}

src/main/groovy/demo/SomeTrait.groovy

package demo

trait SomeTrait {
    void someMethod() {
    }
}

src/test/groovy/demo/SomeClassSpec.groovy

package demo

import spock.lang.Specification
class SomeClassSpec extends Specification {

    void 'test something'() {
        given:
        SomeClass.metaClass.someMethod = { ->
            throw new UnsupportedOperationException()
        }

        when:
        new SomeClass().someMethod()

        then:
        UnsupportedOperationException ex = thrown()
    }
}

If I remove the method from the trait, the test passes.