diff --git a/python/damask/__init__.py b/python/damask/__init__.py
index 91ca09b29..a1ccfa3f6 100644
--- a/python/damask/__init__.py
+++ b/python/damask/__init__.py
@@ -15,6 +15,7 @@ with open(_Path(__file__).parent/_Path('VERSION')) as _f:
     version = _re.sub(r'^v','',_f.readline().strip())
     __version__ = version
 
+# make classes directly accessible as damask.Class
 from ._environment import Environment as _ # noqa
 environment = _()
 from .                 import util             # noqa
@@ -24,7 +25,6 @@ from .                 import mechanics        # noqa
 from .                 import solver           # noqa
 from .                 import grid_filters     # noqa
 from .                 import lattice          # noqa
-# make classes directly accessible as damask.Class
 from ._rotation        import Rotation         # noqa
 from ._orientation     import Orientation      # noqa
 from ._table           import Table            # noqa
diff --git a/python/damask/_orientation.py b/python/damask/_orientation.py
index c5e853212..05301561f 100644
--- a/python/damask/_orientation.py
+++ b/python/damask/_orientation.py
@@ -851,7 +851,7 @@ class Orientation(Rotation):
         ...    }
 
         """
-        if vector.shape[-1] != 3:
+        if np.array(vector).shape[-1] != 3:
             raise ValueError('Input is not a field of three-dimensional vectors.')
 
         vector_ = self.to_SST(vector,proper) if in_SST else \
diff --git a/python/damask/_vtk.py b/python/damask/_vtk.py
index 8e6cf490c..2f4d63791 100644
--- a/python/damask/_vtk.py
+++ b/python/damask/_vtk.py
@@ -140,7 +140,7 @@ class VTK:
 
         """
         if not os.path.isfile(fname):                                                               # vtk has a strange error handling
-            raise FileNotFoundError(f'No such file: {fname}')
+            raise FileNotFoundError(f'no such file: {fname}')
         ext = Path(fname).suffix
         if ext == '.vtk' or dataset_type is not None:
             reader = vtk.vtkGenericDataObjectReader()
diff --git a/python/tests/conftest.py b/python/tests/conftest.py
index 9410ba15a..719fa8e61 100644
--- a/python/tests/conftest.py
+++ b/python/tests/conftest.py
@@ -82,7 +82,7 @@ def set_of_quaternions():
 
         return qu
 
-    n = 1100
+    n = 600
     scatter=1.e-2
     specials = np.array([
                          [1.0, 0.0, 0.0, 0.0],
diff --git a/python/tests/test_Orientation.py b/python/tests/test_Orientation.py
index e0f8a1570..edc5a79d8 100644
--- a/python/tests/test_Orientation.py
+++ b/python/tests/test_Orientation.py
@@ -16,7 +16,7 @@ def reference_dir(reference_dir_base):
 
 @pytest.fixture
 def set_of_rodrigues(set_of_quaternions):
-    return Rotation(set_of_quaternions).as_Rodrigues_vector()[:200]
+    return Rotation(set_of_quaternions).as_Rodrigues_vector()
 
 
 class TestOrientation:
@@ -275,13 +275,13 @@ class TestOrientation:
 
     @pytest.mark.parametrize('lattice',Orientation.crystal_families)
     def test_in_FZ_vectorization(self,set_of_rodrigues,lattice):
-        result = Orientation.from_Rodrigues_vector(rho=set_of_rodrigues.reshape((50,4,-1)),lattice=lattice).in_FZ.reshape(-1)
+        result = Orientation.from_Rodrigues_vector(rho=set_of_rodrigues.reshape((-1,4,4)),lattice=lattice).in_FZ.reshape(-1)
         for r,rho in zip(result,set_of_rodrigues[:len(result)]):
             assert r == Orientation.from_Rodrigues_vector(rho=rho,lattice=lattice).in_FZ
 
     @pytest.mark.parametrize('lattice',Orientation.crystal_families)
     def test_in_disorientation_FZ_vectorization(self,set_of_rodrigues,lattice):
-        result = Orientation.from_Rodrigues_vector(rho=set_of_rodrigues.reshape((50,4,-1)),
+        result = Orientation.from_Rodrigues_vector(rho=set_of_rodrigues.reshape((-1,4,4)),
                                             lattice=lattice).in_disorientation_FZ.reshape(-1)
         for r,rho in zip(result,set_of_rodrigues[:len(result)]):
             assert r == Orientation.from_Rodrigues_vector(rho=rho,lattice=lattice).in_disorientation_FZ
diff --git a/python/tests/test_Rotation.py b/python/tests/test_Rotation.py
index 8b99f34ec..cc22aba4d 100644
--- a/python/tests/test_Rotation.py
+++ b/python/tests/test_Rotation.py
@@ -862,16 +862,16 @@ class TestRotation:
 
 
     @pytest.mark.parametrize('function,invalid',[(Rotation.from_quaternion, np.array([-1,0,0,0])),
-                                                 (Rotation.from_quaternion, np.array([1,1,1,0])),
-                                                 (Rotation.from_Euler_angles,     np.array([1,4,0])),
-                                                 (Rotation.from_axis_angle, np.array([1,0,0,4])),
-                                                 (Rotation.from_axis_angle, np.array([1,1,0,1])),
-                                                 (Rotation.from_matrix,     np.random.rand(3,3)),
-                                                 (Rotation.from_matrix,     np.array([[1,1,0],[1,2,0],[0,0,1]])),
+                                                 (Rotation.from_quaternion,        np.array([1,1,1,0])),
+                                                 (Rotation.from_Euler_angles,      np.array([1,4,0])),
+                                                 (Rotation.from_axis_angle,        np.array([1,0,0,4])),
+                                                 (Rotation.from_axis_angle,        np.array([1,1,0,1])),
+                                                 (Rotation.from_matrix,            np.random.rand(3,3)),
+                                                 (Rotation.from_matrix,            np.array([[1,1,0],[1,2,0],[0,0,1]])),
                                                  (Rotation.from_Rodrigues_vector,  np.array([1,0,0,-1])),
                                                  (Rotation.from_Rodrigues_vector,  np.array([1,1,0,1])),
-                                                 (Rotation.from_homochoric, np.array([2,2,2])),
-                                                 (Rotation.from_cubochoric, np.array([1.1,0,0]))  ])
+                                                 (Rotation.from_homochoric,        np.array([2,2,2])),
+                                                 (Rotation.from_cubochoric,        np.array([1.1,0,0]))  ])
     def test_invalid_value(self,function,invalid):
         with pytest.raises(ValueError):
             function(invalid)