Adding tests

Local installation

VS2N.py

__init__.py

src/Global_Var.py

src/Modules/General/callbacks.py

src/Modules/Synapse/callbacks.py

src/Modules/Synapse/spark.py

tests/Modules/test_General_callbacks.py

tests/Modules/test_General_layout.py

tests/Modules/test_General_spark.py

tests/Modules/test_Neuron_callbacks.py

tests/Modules/test_Neuron_layout.py

tests/Modules/test_Neuron_spark.py

tests/Modules/test_Synapse_callbacks.py

tests/Modules/test_Synapse_layout.py

tests/Modules/test_Synapse_spark.py

tests/__init__.py

tests/conftest.py

tests/test_Global_var.py