human
Solve the following python programming problem given the following code:
def testOrder(self) : 
    class MetadataTestNodeA (Gaffer.Node) : 
        def __init__(self, name = 'MetadataTestNodeOne') : 
            Gaffer.Node.__init__ (self, name) 
            self ['a'] = Gaffer.IntPlug () 
IECore.registerRunTimeTyped (MetadataTestNodeA) 
    class MetadataTestNodeB (MetadataTestNodeA) : 
        def __init__(self, name = 'MetadataTestNodeOne') : 
            MetadataTestNodeA.__init__ (self, name) 
IECore.registerRunTimeTyped (MetadataTestNodeB) 
    node = MetadataTestNodeB () 
    Gaffer.Metadata.registerNodeValue (node, 'nodeSeven', 7) 
    Gaffer.Metadata.registerNodeValue (node, 'nodeEight', 8) 
    Gaffer.Metadata.registerNodeValue (node, 'nodeNine', 9) 
    Gaffer.Metadata.registerNodeValue (MetadataTestNodeB, 'nodeFour', 4) 
    Gaffer.Metadata.registerNodeValue (MetadataTestNodeB, 'nodeFive', 5) 
    Gaffer.Metadata.registerNodeValue (MetadataTestNodeB, 'nodeSix', 6) 
    Gaffer.Metadata.registerNodeValue (MetadataTestNodeA, 'nodeOne', 1) 
    Gaffer.Metadata.registerNodeValue (MetadataTestNodeA, 'nodeTwo', 2) 
    Gaffer.Metadata.registerNodeValue (MetadataTestNodeA, 'nodeThree', 3) 
    self.assertEqual (Gaffer.Metadata.registeredNodeValues (self), ['nodeOne', 'nodeTwo', 'nodeThree', 'nodeFour', 'nodeFive', 'nodeSix', 'nodeSeven', 'nodeEight', 'nodeNine']) 
    Gaffer.Metadata.registerPlugValue (node ['a'], 'plugSeven', 7) 
    Gaffer.Metadata.registerPlugValue (node ['a'], 'plugEight', 8) 
    Gaffer.Metadata.registerPlugValue (node ['a'], 'plugNine', 9) 
    Gaffer.Metadata.registerPlugValue (MetadataTestNodeB, 'a', 'plugFour', 4) 
    Gaffer.Metadata.registerPlugValue (MetadataTestNodeB, 'a', 'plugFive', 5) 
    Gaffer.Metadata.registerPlugValue (MetadataTestNodeB, 'a', 'plugSix', 6) 
    Gaffer.Metadata.registerPlugValue (MetadataTestNodeA, 'a', 'plugOne', 1) 
    Gaffer.Metadata.registerPlugValue (MetadataTestNodeA, 'a', 'plugTwo', 2) 
    Gaffer.Metadata.registerPlugValue (MetadataTestNodeA, 'a', 'plugThree', 3) 
    self.assertEqual...

    
    

    Fix the buggy line: self.assertEqual (Gaffer.Metadata.registeredNodeValues (self), ['nodeOne', 'nodeTwo', 'nodeThree', 'nodeFour', 'nodeFive', 'nodeSix', 'nodeSeven', 'nodeEight', 'nodeNine'])
assistant
#Here is Python code to fix the buggy line: self.

self.assertEqual (Gaffer.Metadata.registeredNodeValues (node), ['nodeOne', 'nodeTwo', 'nodeThree', 'nodeFour', 'nodeFive', 'nodeSix', 'nodeSeven', 'nodeEight', 'nodeNine'])