config: fiscal_year_begin returns a FiscalYear.

conservancy_beancount/config.py

@@ -33,6 +33,7 @@ from typing import (
     Type,
 )
 
+from . import books
 from . import rtutil
 
 class RTCredentials(NamedTuple):
@@ -130,7 +131,7 @@ class Config:
         config_root = self._path_from_environ('XDG_CONFIG_HOME')
         return Path(config_root, name, 'config.ini')
 
-    def fiscal_year_begin(self) -> Tuple[int, int]:
+    def fiscal_year_begin(self) -> books.FiscalYear:
         s = self.file_config.get('Beancount', 'fiscal year begin', fallback='3 1')
         match = re.match(r'([01]?[0-9])(?:\s*[-./ ]\s*([0-3]?[0-9]))?$', s.strip())
         if match is None:
@@ -146,7 +147,7 @@ class Config:
         except ValueError as e:
             raise ValueError(f"fiscal year begin {s!r} is invalid date: {e.args[0]}")
         else:
-            return (month, day)
+            return books.FiscalYear(month, day)
 
     def payment_threshold(self) -> decimal.Decimal:
         return decimal.Decimal(0)

tests/test_config.py

@@ -378,4 +378,6 @@ def test_bad_fiscal_year_begin(value):
 
 def test_default_fiscal_year_begin():
     config = config_mod.Config()
-    assert config.fiscal_year_begin() == (3, 1)
+    actual = config.fiscal_year_begin()
+    assert actual.month == 3
+    assert actual.day == 1