human
Solve the following python programming problem given the following code:
def test_Cycle(self) : 
    'Test that an exception is thrown on a cyclic graph.' 
    graph = { 
        'a' : ['b'], 
        'b' : ['c'], 
        'c' : ['d'], 
        'd' : ['a'], 
} 
    def GetEdge(node) : 
        return tuple (graph [node]) 
self.assertRaises (gyp.common.CycleError, gyp.common.TopologicallySorted, graph.keys (), graph) 

    
    

    Fix the buggy line: self.assertRaises (gyp.common.CycleError, gyp.common.TopologicallySorted, graph.keys (), graph)
assistant
#Here is Python program to fix the buggy line: self.

self.assertRaises (gyp.common.CycleError, gyp.common.TopologicallySorted, graph.keys (), def GetEdge()