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testing systematically all possibilities

This commit is contained in:
Martin Diehl 2020-05-28 08:05:02 +02:00
parent 31f72aa912
commit 1afa00a19c
1 changed files with 7 additions and 7 deletions
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14
python/tests/test_mechanics.py
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@ -63,25 +63,25 @@ class TestMechanics:
assert np.allclose(np.matmul(R,U),
np.matmul(V,R))
def test_strain_tensor_no_rotation(self):
@pytest.mark.parametrize('m',[0.0,np.random.random()*10.,np.random.random()*-10.])
def test_strain_tensor_no_rotation(self,m):
"""Ensure that left and right stretch give same results for no rotation."""
F = np.broadcast_to(np.eye(3),[self.n,3,3])*np.random.rand(self.n,3,3)
m = np.random.random()*20.0-10.0
assert np.allclose(mechanics.strain_tensor(F,'U',m),
mechanics.strain_tensor(F,'V',m))
def test_strain_tensor_rotation_equivalence(self):
@pytest.mark.parametrize('m',[0.0,np.random.random()*2.5,np.random.random()*-2.5])
def test_strain_tensor_rotation_equivalence(self,m):
"""Ensure that left and right strain differ only by a rotation."""
F = np.broadcast_to(np.eye(3),[self.n,3,3]) + (np.random.rand(self.n,3,3)*0.5 - 0.25)
m = np.random.random()*5.0-2.5
assert np.allclose(np.linalg.det(mechanics.strain_tensor(F,'U',m)),
np.linalg.det(mechanics.strain_tensor(F,'V',m)))
def test_strain_tensor_rotation(self):
@pytest.mark.parametrize('m',[0.0,np.random.random(),np.random.random()*-1.])
@pytest.mark.parametrize('t',['V','U'])
def test_strain_tensor_rotation(self,m,t):
"""Ensure that pure rotation results in no strain."""
F = mechanics.rotational_part(np.random.rand(self.n,3,3))
t = ['V','U'][np.random.randint(0,2)]
m = np.random.random()*2.0 - 1.0
assert np.allclose(mechanics.strain_tensor(F,t,m),
0.0)