def test_launch(self):
"""
Check that all required keys are present in output from BrainViewer launch.
"""
viewer = ConnectivityViewer()
view_model = viewer.get_view_model_class()()
view_model.connectivity = UUID(self.connectivity_index.gid)
result = viewer.launch(view_model)
expected_keys = ['weightsMin', 'weightsMax', 'urlWeights', 'urlVertices',
'urlTriangles', 'urlTracts', 'urlPositions', 'urlNormals',
'rightHemisphereJson', 'raysArray', 'rayMin', 'rayMax', 'positions',
'leftHemisphereJson', 'connectivity_entity', 'bothHemisphereJson']
for key in expected_keys:
assert key in result
