Groovy script to find out the difference between two maps. Can be useful to debug failing unit tests when the objects in comparison are big jsons.

MapDiff.groovy

def mapDiff(Map m1, Map m2, String path="") {    m1.each{k,v->
        if(m2[k] != m1[k]) {
            if(m1[k] in Map) {
                mapDiff(m1[k] as Map, m2[k] as Map, "${path}${k}.")
            }
            else {
                println("${path}${k} ->");
                println("\texpected: ${m1[k]}")
                println("\tactual: ${m2[k]}")
                if (m1[k] in List) {
                    print("\texpected but missing elements: ")
                    m1[k].each {
                        if(!m2[k].any{it1->return it1==it}) {
                            print(it + ", ")
                        }
                    }
                    print("\tnot expected but found: ")
                    m2[k].each {
                        if(!m1[k].any{it1->return it1==it}) {
                            print(it + ", ")
                        }
                    }

                }
                println("")
            }
        }

    }
}

Hi, I have two questions

1. what is String path="" parameter?
2. what is 'k' in m1[k]?
   Is it a specific key in a map that needs to be specified ?

1. path has a default value of empty string, it is used for recursion. So when you call mapDiff you just need to pass two maps and not worry about path
2. k in key in the map m1 refer line 1 m1.each{k,v->