Solving problems related to Geometry (#118)

* fix and add tests
* minor fix on domain classes

---------

Co-authored-by: Dario Coscia <dariocoscia@cli-10-110-0-208.WIFIeduroamSTUD.units.it>
Co-authored-by: Dario Coscia <dariocoscia@dhcp-040.eduroam.sissa.it>

tests/test_ellipsoid.py

@@ -0,0 +1,30 @@
+import torch
+import pytest
+
+from pina import LabelTensor
+from pina.geometry import EllipsoidDomain
+
+
+
+def test_constructor():
+    EllipsoidDomain({'x': [0, 1], 'y': [0, 1]})
+    EllipsoidDomain({'x': [0, 1], 'y':[0, 1]}, sample_surface=True)
+
+
+def test_is_inside_sample_surface_false():
+    domain = EllipsoidDomain({'x': [0, 1], 'y':[0, 1]}, sample_surface=False)
+    pt_1 = LabelTensor(torch.tensor([[0.5, 0.5]]), ['x', 'y'])
+    pt_2 = LabelTensor(torch.tensor([[1.0, 0.5]]), ['x', 'y'])
+    pt_3 = LabelTensor(torch.tensor([[1.5, 0.5]]), ['x', 'y'])
+    for pt, exp_result in zip([pt_1, pt_2, pt_3], [True, False, False]):
+        assert domain.is_inside(pt) == exp_result
+    for pt, exp_result in zip([pt_1, pt_2, pt_3], [True, True, False]):
+        assert domain.is_inside(pt, check_border=True) == exp_result
+
+def test_is_inside_sample_surface_true():
+    domain = EllipsoidDomain({'x': [0, 1], 'y':[0, 1]}, sample_surface=True)
+    pt_1 = LabelTensor(torch.tensor([[0.5, 0.5]]), ['x', 'y'])
+    pt_2 = LabelTensor(torch.tensor([[1.0, 0.5]]), ['x', 'y'])
+    pt_3 = LabelTensor(torch.tensor([[1.5, 0.5]]), ['x', 'y'])
+    for pt, exp_result in zip([pt_1, pt_2, pt_3], [False, True, False]):
+        assert domain.is_inside(pt) == exp_result