Adding point cloud sampling examples (#770)

tests/test_point_cloud_sampling.py

@@ -0,0 +1,15 @@
+import conftest  # Add root path to sys.path
+from Mapping.point_cloud_sampling import point_cloud_sampling as m
+
+
+def test_1(capsys):
+    m.do_plot = False
+    m.main()
+    captured = capsys.readouterr()
+    assert "voxel_sampling_points.shape=(27, 3)" in captured.out
+    assert "farthest_sampling_points.shape=(20, 3)" in captured.out
+    assert "poisson_disk_points.shape=(20, 3)" in captured.out
+
+
+if __name__ == '__main__':
+    conftest.run_this_test(__file__)