       expect(changedDecorationNode.children.length).toBe 0
 
     it "removes any decorations that existed previously but aren't in the latest update", ->
-      customDecorations = 'test-gutter':
+      customDecorations =
         'decoration-id-1':
           top: 0
           height: 10


    buildTestState = (customDecorations) ->
      mockTestState =
        gutters:
          scrollHeight: 100
          scrollTop: 10
          backgroundColor: 'black'
          sortedDescriptions: [{gutter, visible: true}]
          customDecorations: customDecorations
        lineNumberGutter:
          maxLineNumberDigits: 10
          lineNumbers: {}
      mockTestState

    it "sets the custom-decoration wrapper's scrollHeight, scrollTop, and background color", ->

      expect(decorationItem).toBe decorationItem1

    it "updates the existing DOM node for a decoration that existed but has new properties", ->
      initialCustomDecorations =
        'decoration-id-1':
          top: 0
          height: 10
