copySpec.filesMatching([], matchingAction)

        then:
        def exception = thrown(InvalidUserDataException)
        exception.message == 'must provide at least one pattern to match'
    }

    def canNotMatchFiles() {
        given:
        FileCopyDetails details1 = details('path/abc.txt')
        FileCopyDetails details2 = details('path/bcd.txt')

        Action matchingAction = Mock()

        when: