diff --git a/tests/test_sharded_dataset.py b/tests/test_sharded_dataset.py
index 3cf0d78e6..2fb9cf4d8 100644
--- a/tests/test_sharded_dataset.py
+++ b/tests/test_sharded_dataset.py
@@ -35,7 +35,7 @@ def test_sniff_format_for_parquet():
         f.flush()
 
         assert _sniff_format_for_dataset(f.name) == ".parquet"
-    
+
 
 @skip_if_no_soundlibs
 def test_resolve_audio_pointer():
@@ -56,15 +56,17 @@ def test_basic_parquet_datasource_read_row():
         table = pa.Table.from_pydict(data)
         pq.write_table(table, f.name)
 
-        # Instantiate the ParquetDataSource
         datasource = ParquetDataSource([f.name])
 
+        assert len(datasource.shard_names) == 1, "Expected only one shard"
+        shard_name = datasource.shard_names[0]
+
         # sanity check: Read data starting from row 1
-        row_data = list(datasource.open_shard_at_row(shard_name=f.name.replace(".", "_"), row=1))
+        row_data = list(datasource.open_shard_at_row(shard_name=shard_name, row=1))
 
         # Verify the output
         assert len(row_data) == 2  # We expect 2 rows starting from index 1
         assert row_data[0]["column1"] == "value2"
         assert row_data[0]["column2"] == 20
         assert row_data[1]["column1"] == "value3"
-        assert row_data[1]["column2"] == 30
\ No newline at end of file
+        assert row_data[1]["column2"] == 30