fix: bell and minute rollover, add test case

test/test_time.py

@@ -60,7 +60,7 @@ def test_time_operator(self):
         assert t1 != 1
         assert not t1 == 1
 
-    def test_rollover(self):
+    def test_positive_rollover(self):
         et = EorzeaTime()
         et.sun = 1
         et.bell = 23
@@ -83,6 +83,37 @@ def test_rollover(self):
         assert et.bell == 3
         assert et.sun == 4
 
+    def test_negative_rollover(self):
+        et = EorzeaTime()
+        et.sun = 1
+        et.bell = 0
+        et.minute = 0
+
+        et.minute -= 1
+
+        assert et.minute == 59
+        assert et.bell == 23
+        assert et.sun == 32
+        assert et.moon == 1
+        assert et.year == 1070
+
+        et.minute -= 119
+
+        assert et.minute == 0
+        assert et.bell == 22
+
+        et.bell -= 48
+
+        assert et.minute == 0
+        assert et.bell == 22
+        assert et.sun == 30
+        assert et.moon == 1
+
+        et.moon -= 11
+
+        assert et.moon == 2
+        assert et.year == 1069
+
     def test_property(self):
         ts = 12700000
         et = EorzeaTime(ts)
@@ -96,16 +127,6 @@ def test_property(self):
         assert et.moon_phase == 0.50
         assert et.moon_name == "Sixth Embral Moon"
 
-        et = EorzeaTime()
-        et.moon += 13
-        et.sun += 33
-        et.bell += 26
-        et.minute += 65
-        et.moon -= 13
-        et.sun -= 33
-        et.bell -= 26
-        et.minute -= 65
-
     def test_repr(self):
         et = EorzeaTime.now()
         assert repr(et) == f"EorzeaTime({et.get_unix_time()})"