Prevent duplicate consecutive nodes (#1296)

test/spec/core/way.js

@@ -221,6 +221,15 @@ describe('iD.Way', function() {
             expect(w.removeNode('a').nodes).to.eql([]);
         });
 
+        it("prevents duplicate consecutive nodes", function () {
+            var a = iD.Node({id: 'a'}),
+                b = iD.Node({id: 'b'}),
+                c = iD.Node({id: 'c'}),
+                w = iD.Way({nodes: ['a', 'b', 'c', 'b']});
+
+            expect(w.removeNode('c').nodes).to.eql(['a', 'b']);
+        });
+
         it("preserves circularity", function () {
             var a = iD.Node({id: 'a'}),
                 b = iD.Node({id: 'b'}),
@@ -230,6 +239,16 @@ describe('iD.Way', function() {
 
             expect(w.removeNode('a').nodes).to.eql(['b', 'c', 'd', 'b']);
         });
+
+        it("prevents duplicate consecutive nodes when preserving circularity", function () {
+            var a = iD.Node({id: 'a'}),
+                b = iD.Node({id: 'b'}),
+                c = iD.Node({id: 'c'}),
+                d = iD.Node({id: 'd'}),
+                w = iD.Way({nodes: ['a', 'b', 'c', 'd', 'b', 'a']});
+
+            expect(w.removeNode('a').nodes).to.eql(['b', 'c', 'd', 'b']);
+        });
     });
 
     describe("#asJXON", function () {