diff --git a/sktalk/corpus/conversation.py b/sktalk/corpus/conversation.py
index 2dd5a74..a6fbce4 100644
--- a/sktalk/corpus/conversation.py
+++ b/sktalk/corpus/conversation.py
@@ -79,4 +79,4 @@ def subconversation(self, index):
     def until_next(self):
         if len(self.utterances) != 2:
             raise ValueError("Conversation must have 2 utterances")
-        return self.utterances[0].until(self.utterances[1])
\ No newline at end of file
+        return self.utterances[0].until(self.utterances[1])
diff --git a/sktalk/corpus/utterance.py b/sktalk/corpus/utterance.py
index 3590be7..9286789 100644
--- a/sktalk/corpus/utterance.py
+++ b/sktalk/corpus/utterance.py
@@ -47,6 +47,5 @@ def asdict(self):
     def until(self, next_utt):
         return next_utt.time[0] - self.time[1]
 
-
     # TODO function: that prints summary of data, shows it to user
     # TODO function: create a pandas data frame with the utterances
diff --git a/tests/conftest.py b/tests/conftest.py
index d483521..1998a63 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -27,12 +27,12 @@ def convo_utts():
     utterance1 = Utterance(
         utterance="Hello",
         participant="A",
-        time = [0, 1000]
+        time=[0, 1000]
     )
     utterance2 = Utterance(
         utterance="Monde",
         participant="B",
-        time = [900, 1800]
+        time=[900, 1800]
     )
     return [utterance1, utterance2]
 
diff --git a/tests/corpus/test_conversation.py b/tests/corpus/test_conversation.py
index 6ea0a82..394b5f3 100644
--- a/tests/corpus/test_conversation.py
+++ b/tests/corpus/test_conversation.py
@@ -48,4 +48,4 @@ def test_write_json(self, my_convo, tmp_path, user_path, expected_path):
             assert my_convo_read == my_convo.asdict()
 
     def test_until(self, my_convo):
-        assert my_convo.subconversation(0).until_next == -100
\ No newline at end of file
+        assert my_convo.subconversation(0).until_next == -100
diff --git a/tests/corpus/test_utterance.py b/tests/corpus/test_utterance.py
index deb9cd6..ed26e66 100644
--- a/tests/corpus/test_utterance.py
+++ b/tests/corpus/test_utterance.py
@@ -31,4 +31,4 @@ def test_asdict(self):
 
     def test_until(self, convo_utts):
         utt1, utt2 = convo_utts
-        assert utt1.until(utt2) == -100
\ No newline at end of file
+        assert utt1.until(utt2) == -100