Fixed broken imports

Author: OliverBScott

tests/analysis/test_cse.py

@@ -3,10 +3,10 @@
 """
 
 import random
-
 import scaffoldgraph as sg
-from scaffoldgraph.analysis import CSE
 
+from scaffoldgraph.analysis import CSE
+from .. import mock_sdf
 
 def test_cse(sdf_file):
     network = sg.ScaffoldNetwork.from_sdf(sdf_file)

tests/test_network.py

@@ -6,6 +6,8 @@
 
 import scaffoldgraph as sg
 
+from . import mock_sdf, mock_smiles_file
+
 
 @pytest.fixture(name='test_net')
 def test_network(sdf_file):

tests/test_tree.py

@@ -7,6 +7,8 @@
 
 import scaffoldgraph as sg
 
+from . import mock_sdf, mock_smiles_file
+
 
 @pytest.fixture(name='test_tree')
 def test_tree_graph(sdf_file):