Address coverage issues flagged by codecov

src/undate/converters/edtf/transformer.py

@@ -54,24 +54,19 @@ def year_unspecified(self, items):
         return Tree(data="year", children=[value])
 
     def month_unspecified(self, items):
+        # combine multiple parts into a single string
         value = "".join(self.get_values(items))
         return Tree(data="month", children=[value])
 
     def day_unspecified(self, items):
+        # combine multiple parts into a single string
         value = "".join(self.get_values(items))
         return Tree(data="day", children=[value])
 
     def date_level1(self, items):
         return self.date(items)
 
-    def year(self, items):
-        # when the year is negative, there are two tokens
-        if len(items) > 1 and items[0] == "-":
-            # an anonymous token for the - and the integer year
-            year = items[1]
-            return Tree(data="year", children=[-year])
-
-        return Tree(data="year", children=[items[0]])
+    # year (including negative years) use default transformation
 
     def year_fivedigitsplus(self, items):
         # strip off the leading Y and convert to integer

tests/test_converters/test_base.py

@@ -1,7 +1,7 @@
 import logging
 
 import pytest
-from undate.converters.base import BaseDateConverter
+from undate.converters.base import BaseDateConverter, BaseCalendarConverter
 
 
 class TestBaseDateConverter:
@@ -62,3 +62,15 @@ class ISO8601DateFormat2(BaseDateConverter):
     assert len(BaseDateConverter.available_converters()) != len(
         BaseDateConverter.subclasses()
     )
+
+
+class TestBaseCalendarConverter:
+    def test_not_implemented(self):
+        with pytest.raises(NotImplementedError):
+            BaseCalendarConverter().min_month()
+        with pytest.raises(NotImplementedError):
+            BaseCalendarConverter().max_month(1900)
+        with pytest.raises(NotImplementedError):
+            BaseCalendarConverter().max_day(1900, 12)
+        with pytest.raises(NotImplementedError):
+            BaseCalendarConverter().to_gregorian(1900, 12, 31)