minor test changes

tests/test_paths.py

@@ -100,7 +100,7 @@ def test_discrete(self):
             # Y should not have moved
             assert g.np.allclose(d.bounds[:, 1], ori[:, 1])
 
-            if len(d.vertices) < 150:
+            if len(d.polygons_full) > 0 and len(d.vertices) < 150:
                 g.log.info('Checking medial axis on %s',
                            d.metadata['file_name'])
                 m = d.medial_axis()

tests/test_svg.py

@@ -12,8 +12,12 @@ def test_svg(self):
             exported = d.export(file_type='svg')
             # load the exported SVG
             stream = g.trimesh.util.wrap_as_stream(exported)
-            loaded = g.trimesh.load(stream, file_type='svg')
 
+            if g.np.isclose(d.area, 0.0):
+                continue
+
+            loaded = g.trimesh.load(stream, file_type='svg')
+
             # we only have line and arc primitives as SVG
             # export and import
             if all(i.__class__.__name__ in ['Line', 'Arc']

trimesh/path/entities.py

@@ -366,7 +366,7 @@ def angle(self, vertices):
 
         return angle
 
-    def length(self):
+    def length(self, vertices):
         return 0.0
 
     def discrete(self, *args, **kwargs):

trimesh/path/path.py

@@ -118,7 +118,7 @@ def layers(self):
         ---------
         layers: (len(entities), ) list of str
         """
-        layer = [None] * len(self.entities)
+        layer = ['NONE'] * len(self.entities)
         for i, e in enumerate(self.entities):
             if hasattr(e, 'layer'):
                 layer[i] = str(e.layer)
@@ -1098,7 +1098,7 @@ def area(self):
         ---------
         area: float, total area of polygons minus interiors
         """
-        area = sum(i.area for i in self.polygons_full)
+        area = float(sum(i.area for i in self.polygons_full))
         return area
 
     @caching.cache_decorator