test GNNLux training examples #523
Description
we should add to the test set the counterparts of https://github.com/JuliaGraphs/GraphNeuralNetworks.jl/tree/master/GraphNeuralNetworks/test/examples
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we should add to the test set the counterparts of https://github.com/JuliaGraphs/GraphNeuralNetworks.jl/tree/master/GraphNeuralNetworks/test/examples