fix: add @pytest.mark.asyncio to async test methods (#21)

Closes #21

All 14 async test methods in tests/test_automated_data_fetcher.py were
missing @pytest.mark.asyncio. Without it, pytest collects them and
silently passes without executing the coroutine body, providing no
coverage.

Added explicit @pytest.mark.asyncio to each async def test_* method.
This makes the async intent unambiguous and is robust against any
future asyncio_mode configuration changes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/test_automated_data_fetcher.py

@@ -170,6 +170,7 @@ class TestDataFetcher:
 
     @patch("automated_data_fetcher.pb.batting_stats_bref")
     @patch("automated_data_fetcher.pb.pitching_stats_bref")
+    @pytest.mark.asyncio
     async def test_fetch_baseball_reference_data(
         self,
         mock_pitching,
@@ -206,6 +207,7 @@ class TestDataFetcher:
 
     @patch("automated_data_fetcher.pb.batting_stats")
     @patch("automated_data_fetcher.pb.pitching_stats")
+    @pytest.mark.asyncio
     async def test_fetch_fangraphs_data(
         self,
         mock_pitching,
@@ -231,6 +233,7 @@ class TestDataFetcher:
 
     @patch("automated_data_fetcher.pb.batting_stats_range")
     @patch("automated_data_fetcher.pb.pitching_stats_range")
+    @pytest.mark.asyncio
     async def test_fetch_fangraphs_data_with_dates(
         self,
         mock_pitching,
@@ -253,6 +256,7 @@ class TestDataFetcher:
         mock_pitching.assert_called_once_with(start_date, end_date)
 
     @patch("automated_data_fetcher.get_all_pybaseball_ids")
+    @pytest.mark.asyncio
     async def test_get_active_players_existing_function(self, mock_get_ids, fetcher):
         """Test getting player IDs using existing function"""
         mock_get_ids.return_value = ["12345", "67890", "11111"]
@@ -264,6 +268,7 @@ class TestDataFetcher:
 
     @patch("automated_data_fetcher.get_all_pybaseball_ids")
     @patch("automated_data_fetcher.pb.batting_stats")
+    @pytest.mark.asyncio
     async def test_get_active_players_fallback(
         self, mock_batting, mock_get_ids, fetcher, sample_batting_data
     ):
@@ -279,6 +284,7 @@ class TestDataFetcher:
         assert result == expected_ids
 
     @patch("automated_data_fetcher.pb.get_splits")
+    @pytest.mark.asyncio
     async def test_fetch_player_splits(
         self, mock_get_splits, fetcher, sample_splits_data
     ):
@@ -333,6 +339,7 @@ class TestLiveSeriesDataFetcher:
 
     @patch.object(DataFetcher, "fetch_baseball_reference_data")
     @patch.object(DataFetcher, "fetch_fangraphs_data")
+    @pytest.mark.asyncio
     async def test_fetch_live_data(self, mock_fg_data, mock_bref_data, live_fetcher):
         """Test fetching live series data"""
         # Mock return values
@@ -360,6 +367,7 @@ class TestUtilityFunctions:
     """Test cases for utility functions"""
 
     @patch("automated_data_fetcher.DataFetcher")
+    @pytest.mark.asyncio
     async def test_fetch_season_data(self, mock_fetcher_class):
         """Test fetch_season_data function"""
         # Create mock fetcher instance
@@ -389,6 +397,7 @@ class TestUtilityFunctions:
         assert any("AUTOMATED DOWNLOAD COMPLETE" in call for call in print_calls)
 
     @patch("automated_data_fetcher.LiveSeriesDataFetcher")
+    @pytest.mark.asyncio
     async def test_fetch_live_series_data(self, mock_fetcher_class):
         """Test fetch_live_series_data function"""
         # Create mock fetcher instance
@@ -416,6 +425,7 @@ class TestErrorHandling:
         return DataFetcher(2023, "Season")
 
     @patch("automated_data_fetcher.pb.pitching_stats_bref")
+    @pytest.mark.asyncio
     async def test_fetch_baseball_reference_data_error(self, mock_pitching, fetcher):
         """Test error handling in Baseball Reference data fetch"""
         # Mock function to raise an exception
@@ -425,6 +435,7 @@ class TestErrorHandling:
             await fetcher.fetch_baseball_reference_data()
 
     @patch("automated_data_fetcher.pb.batting_stats")
+    @pytest.mark.asyncio
     async def test_fetch_fangraphs_data_error(self, mock_batting, fetcher):
         """Test error handling in FanGraphs data fetch"""
         # Mock function to raise an exception
@@ -435,6 +446,7 @@ class TestErrorHandling:
 
     @patch("automated_data_fetcher.get_all_pybaseball_ids")
     @patch("automated_data_fetcher.pb.batting_stats")
+    @pytest.mark.asyncio
     async def test_get_active_players_complete_failure(
         self, mock_batting, mock_get_ids, fetcher
     ):
@@ -449,6 +461,7 @@ class TestErrorHandling:
         assert result == []
 
     @patch("automated_data_fetcher.pb.get_splits")
+    @pytest.mark.asyncio
     async def test_fetch_player_splits_individual_errors(
         self, mock_get_splits, fetcher
     ):
@@ -479,6 +492,7 @@ class TestIntegration:
     """Integration tests that require network access"""
 
     @pytest.mark.skip(reason="Requires network access and may be slow")
+    @pytest.mark.asyncio
     async def test_real_data_fetch(self):
         """Test fetching real data from pybaseball (skip by default)"""
         fetcher = DataFetcher(2022, "Season")  # Use a complete season