def test_sage_feasibility(self):
s = Signomial({(-1, ): 1, (1, ): -1})
s = s**2
s.remove_terms_with_zero_as_coefficient()
status = sage.sage_feasibility(s).solve(solver='ECOS')
assert status == 0
s = s**2
status = sage.sage_feasibility(s).solve(solver='ECOS')
assert status == -np.inf
def test_sage_multiplier_search(self):
s = Signomial({(1, ): 1, (-1, ): -1})**4
s.remove_terms_with_zero_as_coefficient()
val0 = sage.sage_multiplier_search(s, level=1).solve(solver='ECOS')
assert val0 == -np.inf
s_star = sage.sage_primal(s, level=1).solve(solver='ECOS')
s = s - 0.5 * s_star
val1 = sage.sage_multiplier_search(s, level=1).solve(solver='ECOS')
assert val1 == 0