def test_SchoutenTensor_parent_metric_property_and_ValueError():
mt = anti_de_sitter_metric()
St = SchoutenTensor.from_metric(mt)
assert St.parent_metric == St._parent_metric and St.parent_metric == mt
# ValueError test part
try:
St2 = SchoutenTensor(St.tensor(), St.syms, config="uuu")
assert False
except ValueError:
assert True
def test_SchoutenTensor_config_change():
metric = schwarzschild_metric()
t1 = SchoutenTensor.from_metric(metric)
t2 = t1.change_config("ul")
t3 = t2.change_config("ll")
assert t1.config == "ll" and t3.config == "ll"
compare = sympy.Array(np.zeros((4, 4), dtype=int))
testarr = simplify_sympy_array(t1.tensor() - t3.tensor())
assert testarr == compare
def test_Schouten_dim2():
list_metric = np.zeros((2, 2), dtype=int).tolist()
symbolstr = "t r"
syms = sympy.symbols(symbolstr)
metric = MetricTensor(list_metric, syms)
try:
obj = SchoutenTensor.from_metric(metric)
assert False
except ValueError:
assert True
def test_SchoutenTensor_with_arbritary_config():
sch = schwarzschild_metric()
ch = SchoutenTensor.from_metric(sch)
assert ch.parent_metric == ch._parent_metric
# test change_config, should raise ValueError
ch._parent_metric = None
try:
ch_new = ch.change_config("lll")
assert False
except Exception:
return True