compare lists of multiline strings in groovy

listCompare

def first = """item1
item2
item3"""
def second = """item2
item3
item4
item5
item6"""

List list1 = makeList(first)
List list2 = makeList(second)

def makeList(list) {
    List created = new ArrayList()
    list.eachLine { line -> 
        created.add(line)
    }
    return created
}

def unique1 = list1 as Set
def unique2 = list2 as Set

assert unique1.size() == list1.size()
assert unique2.size() == list2.size()

def common = list1.intersect(list2)
print "Common: "
println common

def diff = list1.plus(list2)
diff.removeAll(common)

print "Diff: "
println diff

def remove = diff.intersect(list1)
print "Remove: "
println remove

def add = diff.intersect(list2)
print "Add: "
add.each { line -> 
    println line
}
println "Remove " + remove.size() + " and add " + add.size() + " items"