Adding more tests to trim method

.gitlab-ci.yml

 tests:
-    script: python -m unittest -v
+    script: python -m -v unittest discover tests

AmpScan/trim.py

@@ -31,7 +31,7 @@ class trimMixin(object):
         >>> amp.planarTrim(100, 2)
 
         """
-        if isinstance(height, Number):
+        if isinstance(height, Number) and isinstance(plane, int):
             # planar values for each vert on face 
             fv = self.vert[self.faces, plane]
             # Number points on each face are above cut plane

tests/test_trim.py

@@ -17,6 +17,15 @@ class TestTrim(unittest.TestCase):
 
     def test_trim(self):
         """Tests the trim method of AmpObject"""
+
+        # Testing that the method runs
+        self.amp.planarTrim(0.6, plane=2)
+
+        # Testing invalid data types raise TypeErrors
+        with self.assertRaises(TypeError):
+            self.amp.planarTrim(0.6, plane=[])
+        with self.assertRaises(TypeError):
+            self.amp.planarTrim(0.6, plane=0.9)
         with self.assertRaises(TypeError):
             self.amp.planarTrim([], plane=[])