def test_linked_synapses():
'''
Test linking to a synaptic variable (should raise an error).
'''
G = NeuronGroup(10, '')
S = Synapses(G, G, 'w:1', connect=True)
G2 = NeuronGroup(100, 'x : 1 (linked)')
assert_raises(NotImplementedError, lambda: setattr(G2, 'x', linked_var(S, 'w')))
def test_linked_subexpression_synapse():
'''
Test a complicated setup (not unlikely when using brian hears)
'''
G = NeuronGroup(2, 'dv/dt = 100*Hz : 1',
threshold='v>1', reset='v=0')
G.v = [0, .5]
G2 = NeuronGroup(10, '''I = clip(x, 0, inf) : 1
x : 1 (linked) ''')
# This will not be able to include references to `I` as `I_pre` etc., since
# the indirect indexing would have to change depending on the synapses
G2.x = linked_var(G.v, index=np.array([0, 1]).repeat(5))
S = Synapses(G2, G2, '')
S.connect('i==j')
assert 'I' not in S.variables
assert 'I_pre' not in S.variables
assert 'I_post' not in S.variables
assert 'x' not in S.variables
assert 'x_pre' not in S.variables
assert 'x_post' not in S.variables