def test_constraint_creation():
"""Test constraints creation and methods.
"""
v = Variable('foo')
c = Constraint(v + 1, '==')
assert c.strength() == strength.required and c.op() == '=='
e = c.expression()
t = e.terms()
assert (e.constant() == 1 and len(t) == 1 and t[0].variable() is v
and t[0].coefficient() == 1)
assert str(c) == '1 * foo + 1 == 0 | strength = 1.001e+09'
for s in ('weak', 'medium', 'strong', 'required'):
c = Constraint(v + 1, '>=', s)
assert c.strength() == getattr(strength, s)
def test_constraint_creation():
"""Test constraints creation and methods.
"""
v = Variable('foo')
c = Constraint(v + 1, '==')
assert c.strength() == strength.required and c.op() == '=='
e = c.expression()
t = e.terms()
assert (e.constant() == 1 and
len(t) == 1 and t[0].variable() is v and t[0].coefficient() == 1)
assert str(c) == '1 * foo + 1 == 0 | strength = 1.001e+09'
for s in ('weak', 'medium', 'strong', 'required'):
c = Constraint(v + 1, '>=', s)
assert c.strength() == getattr(strength, s)
def test_constraint_creation(op):
"""Test constraints creation and methods.
"""
v = Variable('foo')
c = Constraint(v + 1, op)
assert c.strength() == strength.required and c.op() == op
e = c.expression()
t = e.terms()
assert (e.constant() == 1 and
len(t) == 1 and t[0].variable() is v and t[0].coefficient() == 1)
constraint_format = r'1 \* foo \+ 1 %s 0 | strength = 1.001e\+[0]+9' % op
assert re.match(constraint_format, str(c))
for s in ('weak', 'medium', 'strong', 'required'):
c = Constraint(v + 1, op, s)
assert c.strength() == getattr(strength, s)
# Ensure we test garbage collection.
del c
gc.collect()
def test_constraint_creation(op):
"""Test constraints creation and methods.
"""
v = Variable('foo')
c = Constraint(v + 1, op)
assert c.strength() == strength.required and c.op() == op
e = c.expression()
t = e.terms()
assert (e.constant() == 1 and
len(t) == 1 and t[0].variable() is v and t[0].coefficient() == 1)
constraint_format = '1 \* foo \+ 1 %s 0 | strength = 1.001e\+[0]+9' % op
assert re.match(constraint_format, str(c))
for s in ('weak', 'medium', 'strong', 'required'):
c = Constraint(v + 1, op, s)
assert c.strength() == getattr(strength, s)
# Ensure we test garbage collection.
del c
gc.collect()