data.Account: is_under accepts multiple arguments.

conservancy_beancount/data.py

@@ -36,18 +36,21 @@ class Account(str):
     SEP = bc_account.sep
 
     def is_real_asset(self) -> bool:
-        return (
+        return bool(
             self.is_under('Assets:')
             and not self.is_under('Assets:PrepaidExpenses')
             and not self.is_under('Assets:PrepaidVacation')
         )
 
-    def is_under(self, acct_s: str) -> bool:
-        return self.startswith(acct_s) and (
-            acct_s.endswith(self.SEP)
-            or self == acct_s
-            or self[len(acct_s)] == self.SEP
-        )
+    def is_under(self, *acct_seq: str) -> Optional[str]:
+        for prefix in acct_seq:
+            if self.startswith(prefix) and (
+                prefix.endswith(self.SEP)
+                or self == prefix
+                or self[len(prefix)] == self.SEP
+            ):
+                return prefix
+        return None
 
 
 class PostingMeta(collections.abc.MutableMapping):

tests/test_data_account.py

@@ -29,9 +29,22 @@ from conservancy_beancount import data
     ('Expenses:Tax:Sales', 'Accrued:', False),
     ('Expenses:Tax:Sales', 'Accrued', False),
 ])
-def test_is_under(acct_name, under_arg, expected):
+def test_is_under_one_arg(acct_name, under_arg, expected):
+    expected = under_arg if expected else None
     assert data.Account(acct_name).is_under(under_arg) == expected
 
+@pytest.mark.parametrize('acct_name,expected', [
+    ('Income:Other', 'Income'),
+    ('UnearnedIncome:Other', 'UnearnedIncome'),
+    ('Accrued:AccountsPayable', None),
+    ('Expenses:General', None),
+])
+def test_is_under_multi_arg(acct_name, expected):
+    assert data.Account(acct_name).is_under('Income', 'UnearnedIncome') == expected
+    if expected:
+        expected += ':'
+    assert data.Account(acct_name).is_under('Income:', 'UnearnedIncome:') == expected
+
 @pytest.mark.parametrize('acct_name,expected', [
     ('Accrued:AccountsPayable', False),
     ('Accrued:AccountsReceivable', False),