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def test_distance(neuron_instance):
"""Test 1D diffusion in a single section"""
h, rxd, data, save_path = neuron_instance
soma = h.Section(name="soma")
dend = h.Section(name="dend")
dend.connect(soma)
cyt = rxd.Region([soma, dend], name="cyt")
c = rxd.Species(cyt, name="c")
assert h.distance(soma(0.5), dend(1)) == 150
assert h.distance(soma(0.5), c.nodes[1]) == 100
assert h.distance(c.nodes(soma), c.nodes(dend)) == 100
h.distance(0, c.nodes(dend))
assert h.distance(1, sec=dend) == 50
assert h.distance(c.nodes[1], sec=soma) == 0
assert h.distance(c.nodes(soma)) == 100
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