Add tests for previous draw date function

tests/test_util.py

@@ -25,6 +25,11 @@ def test_get_next_draw_date_none() -> None:
     assert not ud.get_next_draw_date(game=None)
 
 
+def test_get_previous_draw_date_none() -> None:
+    """Test when a game is not provided."""
+    assert not ud.get_previous_draw_date(game=None)
+
+
 def test_get_next_draw_date_minimum() -> None:
     """Test the next draw date returned for each game and when an invalid name is presented (None)"""
     assert ud.get_next_draw_date(game="mega-millions")
@@ -34,6 +39,15 @@ def test_get_next_draw_date_minimum() -> None:
         ud.get_next_draw_date()
 
 
+def test_get_previous_draw_date_minimum() -> None:
+    """Test the next draw date returned for each game and when an invalid name is presented (None)"""
+    assert ud.get_previous_draw_date(game="mega-millions")
+    assert ud.get_previous_draw_date(game="powerball")
+    assert not ud.get_previous_draw_date(game="something")
+    with pytest.raises(TypeError):
+        ud.get_previous_draw_date()
+
+
 def test_get_next_draw_date_specified_from_date() -> None:
     """Test drawing dates returned for each possible day of the week."""
     assert ud.get_next_draw_date(game="mega-millions", from_date='02/15/2026') == '02/17/2026'
@@ -50,6 +64,22 @@ def test_get_next_draw_date_specified_from_date() -> None:
     assert ud.get_next_draw_date(game='powerball', from_date='02/20/2026') == '02/21/2026'
 
 
+def test_get_previous_draw_date_specified_from_date() -> None:
+    """Test drawing dates returned for each possible day of the week."""
+    assert ud.get_previous_draw_date(game="mega-millions", from_date='02/15/2026') == '02/13/2026'
+    assert ud.get_previous_draw_date(game="mega-millions", from_date='02/16/2026') == '02/13/2026'
+    assert ud.get_previous_draw_date(game="mega-millions", from_date='02/17/2026') == '02/13/2026'
+    assert ud.get_previous_draw_date(game="mega-millions", from_date='02/18/2026') == '02/17/2026'
+    assert ud.get_previous_draw_date(game="mega-millions", from_date='02/19/2026') == '02/17/2026'
+
+    assert ud.get_previous_draw_date(game='powerball', from_date='02/15/2026') == '02/14/2026'
+    assert ud.get_previous_draw_date(game='powerball', from_date='02/16/2026') == '02/14/2026'
+    assert ud.get_previous_draw_date(game='powerball', from_date='02/17/2026') == '02/16/2026'
+    assert ud.get_previous_draw_date(game='powerball', from_date='02/18/2026') == '02/16/2026'
+    assert ud.get_previous_draw_date(game='powerball', from_date='02/19/2026') == '02/18/2026'
+    assert ud.get_previous_draw_date(game='powerball', from_date='02/20/2026') == '02/18/2026'
+
+
 @pytest.mark.parametrize("game", ['powerball', 'mega-millions'])
 def test_scrape_game_history(game) -> None:
     """Test scraping the powerball result page for 1996, 2020, and current year."""