Add custom matcher for anagram to allow a set or array

exercises/practice/anagram/anagram.spec.coffee

@@ -1,88 +1,108 @@
 Anagram = require './anagram'
+
+###
+  The toContainSameValues matcher defined at the bottom
+  checks if your returned collection has the expected elements
+  regardless of the type of collection (array or set).
+###
+
 describe 'Anagram', ->
   it 'no matches', ->
     detector = new Anagram 'diaper'
     matches = detector.match ['hello', 'world', 'zombies', 'pants']
-    expect(matches).toEqual []
+    expect(matches).toContainSameValues []
 
   xit 'detects two anagrams', ->
     detector = new Anagram 'solemn'
-    matches = detector.match ["lemons", "cherry", "melons"]
-    expect(matches).toEqual ["lemons", "melons"]
+    matches = detector.match ['lemons', 'cherry', 'melons']
+    expect(matches).toContainSameValues ['lemons', 'melons']
 
   xit 'does not detect anagram subsets', ->
     detector = new Anagram 'good'
-    matches = detector.match ["dog", "goody"]
-    expect(matches).toEqual []
+    matches = detector.match ['dog', 'goody']
+    expect(matches).toContainSameValues []
 
   xit 'detects anagram', ->
     detector = new Anagram 'listen'
-    matches = detector.match ["enlists", "google", "inlets", "banana"]
-    expect(matches).toEqual ["inlets"]
+    matches = detector.match ['enlists', 'google', 'inlets', 'banana']
+    expect(matches).toContainSameValues ['inlets']
 
   xit 'detects three anagrams', ->
     detector = new Anagram 'allergy'
     matches = detector.match [
-          "gallery",
-          "ballerina",
-          "regally",
-          "clergy",
-          "largely",
-          "leading"
-        ]
-    expect(matches).toEqual ["gallery", "regally", "largely"]
+      'gallery'
+      'ballerina'
+      'regally'
+      'clergy'
+      'largely'
+      'leading'
+    ]
+    expect(matches).toContainSameValues ['gallery', 'largely', 'regally']
 
   xit 'detects multiple anagrams with different case', ->
     detector = new Anagram 'nose'
-    matches = detector.match ["Eons", "ONES"]
-    expect(matches).toEqual ["Eons", "ONES"]
+    matches = detector.match ['Eons', 'ONES']
+    expect(matches).toContainSameValues ['Eons', 'ONES']
 
   xit 'does not detect non-anagrams with identical checksums', ->
     detector = new Anagram 'mass'
     matches = detector.match ['last']
-    expect(matches).toEqual []
+    expect(matches).toContainSameValues []
 
   xit 'detects anagrams case-insensitively', ->
     detector = new Anagram 'Orchestra'
-    matches = detector.match ["cashregister", "Carthorse", "radishes"]
-    expect(matches).toEqual ["Carthorse"]
+    matches = detector.match ['cashregister', 'Carthorse', 'radishes']
+    expect(matches).toContainSameValues ['Carthorse']
 
-  xit 'detects anagrams using case-insensitive subject"', ->
+  xit 'detects anagrams using case-insensitive subject', ->
     detector = new Anagram 'Orchestra'
-    matches = detector.match ["cashregister", "carthorse", "radishes"]
-    expect(matches).toEqual ["carthorse"]
+    matches = detector.match ['cashregister', 'carthorse', 'radishes']
+    expect(matches).toContainSameValues ['carthorse']
 
   xit 'detects anagrams using case-insensitive possible matches', ->
     detector = new Anagram 'Orchestra'
     matches = detector.match ['cashregister', 'Carthorse', 'radishes']
-    expect(matches).toEqual ['Carthorse']
+    expect(matches).toContainSameValues ['Carthorse']
 
   xit 'does not detect an anagram if the original word is repeated', ->
     detector = new Anagram 'go'
-    matches = detector.match ["goGoGO"]
-    expect(matches).toEqual []
+    matches = detector.match ['goGoGO']
+    expect(matches).toContainSameValues []
 
   xit 'anagrams must use all letters exactly once', ->
     detector = new Anagram 'tapper'
-    matches = detector.match ["patter"]
-    expect(matches).toEqual []
+    matches = detector.match ['patter']
+    expect(matches).toContainSameValues []
 
   xit 'words are not anagrams of themselve', ->
     detector = new Anagram 'BANANA'
-    matches = detector.match ["BANANA"]
-    expect(matches).toEqual []
+    matches = detector.match ['BANANA']
+    expect(matches).toContainSameValues []
 
   xit 'words are not anagrams of themselves even if letter case is partially different', ->
     detector = new Anagram 'BANANA'
-    matches = detector.match ["Banana"]
-    expect(matches).toEqual []
+    matches = detector.match ['Banana']
+    expect(matches).toContainSameValues []
 
   xit 'words are not anagrams of themselves even if letter case is completely different', ->
     detector = new Anagram 'BANANA'
-    matches = detector.match ["banana"]
-    expect(matches).toEqual []
+    matches = detector.match ['banana']
+    expect(matches).toContainSameValues []
 
   xit 'words other than themselves can be anagrams', ->
     detector = new Anagram 'LISTEN'
-    matches = detector.match ["LISTEN", "Silent"]
-    expect(matches).toEqual ["Silent"]
+    matches = detector.match ['LISTEN', 'Silent']
+    expect(matches).toContainSameValues ['Silent']
+
+  beforeEach ->
+    @addMatchers
+      toContainSameValues: (expected) ->
+        if not @actual? or !(Array.isArray(@actual) || @actual instanceof Set)
+          @message = -> "Anagram::match should return an array or set but instead returned #{JSON.stringify @actual}." 
+          return false
+
+        matches = Array.from @actual
+        if matches.length != expected.length or not matches.every((value) -> expected.includes value)
+          @message = -> "Expected returned values (#{matches.join(', ')}) to be equal to expected values (#{expected.join(', ')})."
+          return false
+        true