Fix a mistake causing negative indices on ring switches

It might fix espadrine#1 as a side-effect?

Author: espadrine

lib/json-diff/diff.rb

@@ -311,15 +311,10 @@ def self.array_changes(pairing)
       while i < len
         ni = (i + 1) % len  # next i
         if ring[i] != ring[ni]
-          pairs << [ring[i], ring[ni], orig_ring[i][0], orig_ring[ni][1]]
+          pairs << [ring_map.map(ring[i]), ring[ni], orig_ring[i][0], orig_ring[ni][1]]
         end
         ring_map.removal(ring[i])
         ring_map.addition(ring[ni])
-        j = i + 1
-        while j < len
-          ring[j] = ring_map.map(ring[j])
-          j += 1
-        end
         i += 1
       end
     end

lib/json-diff/version.rb

@@ -1,3 +1,3 @@
 module JsonDiff
-  VERSION = '0.3.1'
+  VERSION = '0.3.2'
 end

spec/json-diff/diff_spec.rb

@@ -57,6 +57,20 @@
     ])
   end
 
+  it "should be able to diff a ring switch" do
+    diff = JsonDiff.diff([1, 2, 3], [2, 3, 1], include_was: true)
+    expect(diff).to eql([{"op" => "move", "from" => "/0", "path" => "/2"}])
+  end
+
+  it "should be able to diff a ring switch with removals and additions" do
+    diff = JsonDiff.diff([1, 2, 3, 4], [5, 3, 4, 2], include_was: true)
+    expect(diff).to eql([
+      {"op" => "remove", "path" => "/0", "was" => 1},
+      {"op" => "move", "from" => "/0", "path" => "/2"},
+      {"op" => "add", "path" => "/0", "value" => 5},
+    ])
+  end
+
   it "should be able to diff two arrays with mixed content" do
     diff = JsonDiff.diff(["laundry", 12, {'pillar' => 0}, true], [true, {'pillar' => 1}, 3, 12], include_was: true)
     expect(diff).to eql([