minor tweaks & extra tests to cover new lines

src/scenic/core/regions.py

@@ -835,6 +835,11 @@ def __init__(
         if isLazy(self):
             return
 
+        if not isinstance(mesh, (trimesh.primitives.Primitive, trimesh.base.Trimesh)):
+            raise TypeError(
+                f"Got unexpected mesh parameter of type {type(mesh).__name__}"
+            )
+
         # Apply scaling, rotation, and translation, if any
         if self.rotation is not None:
             angles = self.rotation._trimeshEulerAngles()
@@ -936,9 +941,7 @@ def mesh(self):
         elif isinstance(mesh, trimesh.base.Trimesh):
             mesh = mesh.copy(include_visual=False)
         else:
-            raise TypeError(
-                f"Got unexpected mesh parameter of type {type(mesh).__name__}"
-            )
+            assert False, f"mesh of invalid type {type(mesh).__name__}"
 
         # Center mesh unless disabled
         if self.centerMesh:

src/scenic/core/utils.py

@@ -338,7 +338,10 @@ def findMeshInteriorPoint(mesh, num_samples=None):
         midPt = (surfacePt + endPt) / 2.0
         if mesh.contains([midPt])[0]:
             return midPt
-    return surfacePt
+
+    # Should never get here with reasonable geometry, but we return a surface
+    # point just in case.
+    return surfacePt  # pragma: no cover
 
 
 class DefaultIdentityDict:

tests/core/test_regions.py

@@ -295,6 +295,13 @@ def test_mesh_region_fromFile(getAssetPath):
     )
 
 
+def test_mesh_region_invalid_mesh():
+    with pytest.raises(TypeError):
+        MeshVolumeRegion(42)
+    with pytest.raises(TypeError):
+        MeshSurfaceRegion(42)
+
+
 def test_mesh_volume_region_zero_dimension():
     for dims in ((0, 1, 1), (1, 0, 1), (1, 1, 0)):
         with pytest.raises(ValueError):
@@ -354,6 +361,11 @@ def test_mesh_boundingPolygon(getAssetPath, pytestconfig):
     assertPolygonsEqual(bp.polygons, poly)
 
     shape = MeshShape(BoxRegion(dimensions=(1, 2, 3)).mesh)
+    r = MeshVolumeRegion(shape.mesh, dimensions=(2, 4, 2), _shape=shape)
+    bp = r.boundingPolygon
+    poly = shapely.geometry.Polygon([(-1, 2), (1, 2), (1, -2), (-1, -2)])
+    assertPolygonsEqual(bp.polygons, poly)
+
     o = Orientation.fromEuler(0, 0, math.pi / 4)
     r = MeshVolumeRegion(shape.mesh, dimensions=(2, 4, 2), rotation=o, _shape=shape)
     bp = r.boundingPolygon

tests/core/test_shapes.py

@@ -3,7 +3,8 @@
 
 import pytest
 
-from scenic.core.shapes import BoxShape, MeshShape
+from scenic.core.regions import BoxRegion
+from scenic.core.shapes import BoxShape, CylinderShape, MeshShape
 
 
 def test_shape_fromFile(getAssetPath):
@@ -21,3 +22,15 @@ def test_invalid_dimension(badDim):
             BoxShape(dimensions=dims)
     with pytest.raises(ValueError):
         BoxShape(scale=badDim)
+
+
+def test_circumradius():
+    s = CylinderShape(dimensions=(3, 1, 17))  # dimensions don't matter
+    assert s._circumradius == pytest.approx(math.sqrt(2) / 2)
+
+
+def test_interiorPoint():
+    s = MeshShape(BoxRegion().difference(BoxRegion(dimensions=(0.1, 0.1, 0.1))).mesh)
+    pt = s._interiorPoint
+    assert all(-0.5 <= coord <= 0.5 for coord in pt)
+    assert not all(-0.05 <= coord <= 0.05 for coord in pt)