diff --git a/tests/test_historical.py b/tests/test_historical.py
index 6ea9463befad285ea982fe3d60a38f34845d5ebd..7e935f4c19ef08ecef618b457f55c6ca0552e338 100644
--- a/tests/test_historical.py
+++ b/tests/test_historical.py
@@ -38,6 +38,9 @@ class FakeConfig:
 
 
 output = pytest.fixture(lambda: io.StringIO())
+parametrize_format = pytest.mark.parametrize('output_format', [
+    oxrhist.Formats.LEDGER,
+])
 
 @pytest.fixture(scope='module')
 def single_responder():
@@ -57,7 +60,7 @@ def build_config(
         from_currency=None,
         to_currency=None,
         from_date=None,
-        ledger=False,
+        output_format=oxrhist.Formats.RAW,
         signed_currencies=None,
         denomination=None,
         base='USD',
@@ -69,7 +72,7 @@ def build_config(
         'from_currency': from_currency,
         'to_currency': base if to_currency is None else to_currency,
         'from_date': from_date,
-        'output_format': oxrhist.Formats['LEDGER' if ledger else 'RAW'],
+        'output_format': output_format,
         'signed_currencies': [base] if signed_currencies is None else signed_currencies,
         'denomination': denomination,
     })
@@ -126,61 +129,68 @@ def test_back_conversion(single_responder, output, any_date):
     assert next(lines) == '2.00 USD = 289 ALL\n'
     assert next(lines, None) is None
 
-def test_ledger_rate(single_responder, output, any_date):
+@parametrize_format
+def test_ledger_rate(single_responder, output, any_date, output_format):
     config = build_config(single_responder, any_date,
-                          from_currency='ANG', ledger=True)
+                          from_currency='ANG', output_format=output_format)
     lines = lines_from_run(config, output)
     check_fx_amount(config, lines, '1 ANG', '0.5586', 'USD', '$')
     check_fx_amount(config, lines, '1 USD', '1.79', 'ANG')
     assert next(lines, None) is None
 
-def test_ledger_conversion(single_responder, output, any_date):
-    config = build_config(single_responder, any_date,
-                          from_currency='ALL', amount=300, ledger=True)
+@parametrize_format
+def test_ledger_conversion(single_responder, output, any_date, output_format):
+    config = build_config(single_responder, any_date, from_currency='ALL',
+                          amount=300, output_format=output_format)
     lines = lines_from_run(config, output)
     check_fx_amount(config, lines, '300 ALL', '0.00691', 'USD', '$')
     assert next(lines) == '$2.08\n'
     assert next(lines, None) is None
 
-def test_signed_currencies(single_responder, output, any_date):
-    config = build_config(single_responder, any_date,
-                          from_currency='AED', ledger=True, signed_currencies=['EUR'])
+@parametrize_format
+def test_signed_currencies(single_responder, output, any_date, output_format):
+    config = build_config(single_responder, any_date, from_currency='AED',
+                          output_format=output_format, signed_currencies=['EUR'])
     lines = lines_from_run(config, output)
     check_fx_amount(config, lines, '1 AED', '0.272', 'USD', '$')
     check_fx_amount(config, lines, '1 USD', '3.672', 'AED')
     assert next(lines, None) is None
 
-def test_denomination(single_responder, output, any_date):
+@parametrize_format
+def test_denomination(single_responder, output, any_date, output_format):
     config = build_config(single_responder, any_date,
                           from_currency='ANG', to_currency='AED', amount=10,
-                          ledger=True, denomination='USD')
+                          output_format=output_format, denomination='USD')
     lines = lines_from_run(config, output)
     check_fx_amount(config, lines, '10.00 ANG', '0.558', 'USD', '$')
     check_fx_amount(config, lines, '20.52 AED', '0.272', 'USD', '$')
     assert next(lines, None) is None
 
-def test_redundant_denomination(single_responder, output, any_date):
+@parametrize_format
+def test_redundant_denomination(single_responder, output, any_date, output_format):
     config = build_config(single_responder, any_date,
                           from_currency='ANG', to_currency='USD', amount=10,
-                          ledger=True, denomination='USD')
+                          output_format=output_format, denomination='USD')
     lines = lines_from_run(config, output)
     check_fx_amount(config, lines, '10.00 ANG', '0.558', 'USD', '$')
     assert next(lines) == '$5.59\n'
     assert next(lines, None) is None
 
-def test_from_denomination(single_responder, output, any_date):
+@parametrize_format
+def test_from_denomination(single_responder, output, any_date, output_format):
     config = build_config(single_responder, any_date,
                           from_currency='USD', to_currency='ALL', amount=10,
-                          ledger=True, denomination='USD')
+                          output_format=output_format, denomination='USD')
     lines = lines_from_run(config, output)
     assert next(lines) == '$10.00\n'
     check_fx_amount(config, lines, '1,445 ALL', '0.00691', 'USD', '$')
     assert next(lines, None) is None
 
-def test_rate_precision_added_as_needed(single_responder, output, any_date):
+@parametrize_format
+def test_rate_precision_added_as_needed(single_responder, output, any_date, output_format):
     config = build_config(single_responder, any_date,
                           from_currency='RUB', to_currency='USD', amount=63805,
-                          ledger=True, denomination='USD')
+                          output_format=output_format, denomination='USD')
     lines = lines_from_run(config, output)
     # 63,805 / 57.0763 (the RUB rate) == $1,117.89
     # But using the truncated rate: 63,805 * .01752 == $1,117.86
@@ -190,19 +200,23 @@ def test_rate_precision_added_as_needed(single_responder, output, any_date):
     assert next(lines) == '$1,117.89\n'
     assert next(lines, None) is None
 
-def test_from_date_rates(alternate_responder, output, any_date):
+@parametrize_format
+def test_from_date_rates(alternate_responder, output, any_date, output_format):
     config = build_config(alternate_responder, any_date,
                           from_currency='ANG', to_currency='AED',
-                          from_date=any_date, ledger=True, denomination='USD')
+                          from_date=any_date, output_format=output_format,
+                          denomination='USD')
     lines = lines_from_run(config, output)
     check_fx_amount(config, lines, '1 ANG', '2.051', 'AED', None, '1.909')
     check_fx_amount(config, lines, '1 AED', '0.487', 'ANG', None, '0.523')
     assert next(lines, None) is None
 
-def test_from_date_conversion(alternate_responder, output, any_date):
+@parametrize_format
+def test_from_date_conversion(alternate_responder, output, any_date, output_format):
     config = build_config(alternate_responder, any_date,
                           from_currency='ANG', to_currency='AED', amount=10,
-                          from_date=any_date, ledger=True, denomination='USD')
+                          from_date=any_date, output_format=output_format,
+                          denomination='USD')
     lines = lines_from_run(config, output)
     check_fx_amount(config, lines, '10.00 ANG', '0.558', 'USD', '$', '0.507')
     check_fx_amount(config, lines, '20.52 AED', '0.272', 'USD', '$', '0.265')