Fix tests; remove ClampExistsError

tests/test_optimize/test_optimizer.py

@@ -6,10 +6,8 @@
 from classy_blocks.mesh import Mesh
 from classy_blocks.modify.clamps.free import FreeClamp
 from classy_blocks.modify.clamps.links import TranslationLink
-from classy_blocks.modify.clamps.surface import PlaneClamp
 from classy_blocks.modify.find.geometric import GeometricFinder
 from classy_blocks.modify.iteration import IterationDriver
-from classy_blocks.modify.junction import ClampExistsError
 from classy_blocks.modify.optimizer import Optimizer
 from classy_blocks.util import functions as f
 from classy_blocks.util.constants import VBIG
@@ -134,16 +132,6 @@ def setUp(self):
 
         self.vertex = next(iter(self.finder.find_in_sphere([0, 0, 0])))
 
-    def test_raise_existing(self):
-        """Raise an exception when adding a duplicated clamp/vertex"""
-        first_clamp = FreeClamp(self.vertex)
-        self.optimizer.release_vertex(first_clamp)
-
-        second_clamp = PlaneClamp(self.vertex, self.vertex.position, [0, 0, 1])
-
-        with self.assertRaises(ClampExistsError):
-            self.optimizer.release_vertex(second_clamp)
-
     def test_optimize(self):
         # move a point, then optimize it back to
         # its initial-ish position