def test_filter_dcop():
dcop = DCOP()
d = VariableDomain('test', 'test', values=range(10))
v1 = Variable('v1', d)
v2 = Variable('v2', d)
v3 = Variable('v3', d)
dcop += 'c1', '0 if v1 != v2 else 1000', [v1, v2]
dcop.add_variable(v3)
assert dcop.variables == {'v1': v1, 'v2': v2, "v3": v3}
filtered = filter_dcop(dcop)
assert filtered.variables == {'v1': v1, 'v2': v2}
def test_filter_dcop_unary_constraint_accepted():
dcop = DCOP()
d = VariableDomain('test', 'test', values=range(10))
v1 = Variable('v1', d)
v2 = Variable('v2', d)
v3 = Variable('v3', d)
v4 = Variable('v4', d)
dcop += 'c1', '0 if v1 != v2 else 1000', [v1, v2]
# unary constraint on V3
dcop += 'c2', 'v3 * 0.5', [v3]
dcop.add_variable(v4)
filtered = filter_dcop(dcop, accept_unary=False)
# c2 and v3 must stay here, as we accept unary constraints, but v4 must be gone
assert "v3" in filtered.variables
assert "c2" in filtered.constraints
assert "v4" not in filtered.variables