diff --git a/tests/test_structures_1.py b/tests/test_structures_1.py
index aabd021..87971f2 100644
--- a/tests/test_structures_1.py
+++ b/tests/test_structures_1.py
@@ -40,6 +40,6 @@ def test_structures_2():
     import CoRE_MOF
 
     with pytest.raises(KeyError):
-        s = CoRE_MOF.get_structure("2019-ASR", "trucmuche")
+        CoRE_MOF.get_structure("2019-ASR", "trucmuche")
     with pytest.raises(KeyError):
-        s = CoRE_MOF.get_structure("2019-WTF", "ZUZZEB_clean")
+        CoRE_MOF.get_structure("2019-WTF", "ZUZZEB_clean")
diff --git a/tests/test_structures_2.py b/tests/test_structures_2.py
index 0ba9bce..6b6d78b 100644
--- a/tests/test_structures_2.py
+++ b/tests/test_structures_2.py
@@ -1,4 +1,3 @@
-import math
 import pytest
 import random
 
diff --git a/tests/test_structures_3.py b/tests/test_structures_3.py
index 14239b9..c975a6a 100644
--- a/tests/test_structures_3.py
+++ b/tests/test_structures_3.py
@@ -1,4 +1,3 @@
-import math
 import os
 import pytest
 
@@ -27,9 +26,9 @@ def test_structures_2():
     import CoRE_MOF
 
     with pytest.raises(KeyError):
-        s = CoRE_MOF.get_CIF_structure_data("2019-ASR", "trucmuche")
+        CoRE_MOF.get_CIF_structure_data("2019-ASR", "trucmuche")
     with pytest.raises(KeyError):
-        s = CoRE_MOF.get_CIF_structure_data("2019-WTF", "ZUZZEB_clean")
+        CoRE_MOF.get_CIF_structure_data("2019-WTF", "ZUZZEB_clean")
 
 
 def test_structures_3():
@@ -51,4 +50,3 @@ def test_structures_3():
 
     # Temporary file is automatically removed
     assert not os.path.isfile(fname)
-