diff --git a/src/mkdocs_bibtex/plugin.py b/src/mkdocs_bibtex/plugin.py
index c40a414..0425a53 100644
--- a/src/mkdocs_bibtex/plugin.py
+++ b/src/mkdocs_bibtex/plugin.py
@@ -3,7 +3,6 @@
 import validators
 from collections import OrderedDict
 from pathlib import Path
-from collections import OrderedDict
 
 from mkdocs.plugins import BasePlugin
 
diff --git a/test_files/test_citation.py b/test_files/test_citation.py
index 43ed15c..9fc9f03 100644
--- a/test_files/test_citation.py
+++ b/test_files/test_citation.py
@@ -3,7 +3,6 @@
 pybtex basic citations and pandoc citation formattting
 """
 
-import pytest
 from mkdocs_bibtex.citation import Citation, CitationBlock
 
 
diff --git a/test_files/test_simple_registry.py b/test_files/test_simple_registry.py
index 2ab5dc2..1581271 100644
--- a/test_files/test_simple_registry.py
+++ b/test_files/test_simple_registry.py
@@ -89,7 +89,7 @@ def test_reference_text(simple_registry):
     citation = Citation("Bivort2016", "", "")
     assert (
         simple_registry.reference_text(citation)
-        == "Benjamin L. De Bivort and Bruno Van Swinderen. Evidence for selective attention in the insect brain. *Current Opinion in Insect Science*, 15:1–7, 2016. [doi:10.1016/j.cois.2016.02.007](https://doi.org/10.1016/j.cois.2016.02.007)."
+        == "Benjamin L. De Bivort and Bruno Van Swinderen. Evidence for selective attention in the insect brain. *Current Opinion in Insect Science*, 15:1–7, 2016. [doi:10.1016/j.cois.2016.02.007](https://doi.org/10.1016/j.cois.2016.02.007)." # noqa: E501
     )
 
     # Test citation with URL