def test_imul():
for ms in np.random.uniform(-720, 720, (1000, 4)):
m = Mat2(ms)
if abs(m.det()) < 1e-6:
continue
assert m * m._1 == Mat2.eye()
m *= m._1
assert m == Mat2.eye()
def test_constructor7():
m = Mat2.eye()
assert m is not None
assert m.m11 == approx(1)
assert m.m12 == approx(0)
assert m.m21 == approx(0)
assert m.m22 == approx(1)