Resolve "Remove nose.tools dependency"

Summary

This MR removes nose from the integration tests (related to #23 (closed)).

Focus

Test Environment

Regular integration tests

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tests/test_issues_server.py

@@ -1291,8 +1291,7 @@ def test_143_white_space(num):
     ]:
         with pytest.raises(TransactionError) as cm:
             db.execute_query(query)
-        assert cm.value.msg == f'You typed "{
-            num}". Empty spaces are not allowed in numbers. Did you mean "{num.replace(" ", "")}"?'
+        assert cm.value.msg == f'You typed "{num}". Empty spaces are not allowed in numbers. Did you mean "{num.replace(" ", "")}"?'
 
 
 def test_144():