Fix type hinting issue

Author: Enkidu93

tests/corpora/test_parallel_text_corpus.py

@@ -1029,17 +1029,17 @@ def test_to_pandas() -> None:
     assert df.at[0, "ref"] == 1
     assert df.at[0, "source"] == "source segment 1 ."
     assert df.at[0, "target"] == "target segment 1 ."
-    assert set_equals(df.at[0, "alignment"], [(0, 0)])
+    assert set_equals([df.at[0, "alignment"]], [(0, 0)])
     assert df.at[1, "text"] == "text1"
     assert df.at[1, "ref"] == 2
     assert df.at[1, "source"] == "source segment 2 ."
     assert df.at[1, "target"] == ""
-    assert set_equals(df.at[1, "alignment"], [])
+    assert set_equals([df.at[1, "alignment"]], [])
     assert df.at[2, "text"] == "text1"
     assert df.at[2, "ref"] == 3
     assert df.at[2, "source"] == "source segment 3 ."
     assert df.at[2, "target"] == "target segment 3 ."
-    assert set_equals(df.at[2, "alignment"], [(2, 2)])
+    assert set_equals([df.at[2, "alignment"]], [(2, 2)])
 
 
 def test_from_pandas() -> None: