diff --git a/tests/test_historical.py b/tests/test_historical.py
index 48d4bbc5a299d846b8b81c64841d76822b9a6ba4..a8988aa5b2efebf9da805ea0e9ebd84b543a0428 100644
--- a/tests/test_historical.py
+++ b/tests/test_historical.py
@@ -2,6 +2,7 @@ import argparse
 import decimal
 import io
 import json
+import re
 
 import pytest
 
@@ -68,6 +69,23 @@ def lines_from_run(config, output):
     output.seek(0)
     return iter(output)
 
+def check_fx_amount(config, lines, amount, cost, fx_code, fx_sign=None, price=None):
+    if price is None:
+        price = cost
+    cost = re.escape(cost) + r'\d*'
+    price = re.escape(price) + r'\d*'
+    if fx_sign is not None and fx_code in config.args.signed_currencies:
+        rate_fmt = f'{re.escape(fx_sign)}{{}}'
+    else:
+        rate_fmt = f'{{}} {re.escape(fx_code)}'
+    pattern = r'^{} {{={}}} @ {}$'.format(
+        re.escape(amount),
+        rate_fmt.format(cost),
+        rate_fmt.format(price),
+    )
+    line = next(lines, "<EOF>")
+    assert re.match(pattern, line)
+
 def test_rate_list(historical1_responder, output, any_date):
     config = build_config(historical1_responder, any_date)
     lines = lines_from_run(config, output)
@@ -102,15 +120,15 @@ def test_ledger_rate(historical1_responder, output, any_date):
     config = build_config(historical1_responder, any_date,
                           from_currency='ANG', ledger=True)
     lines = lines_from_run(config, output)
-    assert next(lines) == '1 ANG {=$0.55866} @ $0.55866\n'
-    assert next(lines) == '1 USD {=1.79 ANG} @ 1.79 ANG\n'
+    check_fx_amount(config, lines, '1 ANG', '0.5586', 'USD', '$')
+    check_fx_amount(config, lines, '1 USD', '1.79', 'ANG')
     assert next(lines, None) is None
 
 def test_ledger_conversion(historical1_responder, output, any_date):
     config = build_config(historical1_responder, any_date,
                           from_currency='ALL', amount=300, ledger=True)
     lines = lines_from_run(config, output)
-    assert next(lines) == '300 ALL {=$0.006919} @ $0.006919\n'
+    check_fx_amount(config, lines, '300 ALL', '0.00691', 'USD', '$')
     assert next(lines) == '$2.08\n'
     assert next(lines, None) is None
 
@@ -118,8 +136,8 @@ def test_signed_currencies(historical1_responder, output, any_date):
     config = build_config(historical1_responder, any_date,
                           from_currency='AED', ledger=True, signed_currencies=['EUR'])
     lines = lines_from_run(config, output)
-    assert next(lines) == '1 AED {=0.2723 USD} @ 0.2723 USD\n'
-    assert next(lines) == '1 USD {=3.67246 AED} @ 3.67246 AED\n'
+    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(historical1_responder, output, any_date):
@@ -127,8 +145,8 @@ def test_denomination(historical1_responder, output, any_date):
                           from_currency='ANG', to_currency='AED', amount=10,
                           ledger=True, denomination='USD')
     lines = lines_from_run(config, output)
-    assert next(lines) == '10.00 ANG {=$0.55866} @ $0.55866\n'
-    assert next(lines) == '20.52 AED {=$0.2723} @ $0.2723\n'
+    check_fx_amount(config, lines, '10.00 ANG', '0.558', 'USD', '$')
+    check_fx_amount(config, lines, '20.52 AED', '0.272', 'USD', '$')
     assert next(lines, None) is None
 
 def test_redundant_denomination(historical1_responder, output, any_date):
@@ -136,7 +154,7 @@ def test_redundant_denomination(historical1_responder, output, any_date):
                           from_currency='ANG', to_currency='USD', amount=10,
                           ledger=True, denomination='USD')
     lines = lines_from_run(config, output)
-    assert next(lines) == '10.00 ANG {=$0.55866} @ $0.55866\n'
+    check_fx_amount(config, lines, '10.00 ANG', '0.558', 'USD', '$')
     assert next(lines) == '$5.59\n'
     assert next(lines, None) is None
 
@@ -146,7 +164,7 @@ def test_from_denomination(historical1_responder, output, any_date):
                           ledger=True, denomination='USD')
     lines = lines_from_run(config, output)
     assert next(lines) == '$10.00\n'
-    assert next(lines) == '1,445 ALL {=$0.006919} @ $0.006919\n'
+    check_fx_amount(config, lines, '1,445 ALL', '0.00691', 'USD', '$')
     assert next(lines, None) is None
 
 def test_rate_precision_added_as_needed(historical1_responder, output, any_date):
@@ -158,6 +176,6 @@ def test_rate_precision_added_as_needed(historical1_responder, output, any_date)
     # But using the truncated rate: 63,805 * .01752 == $1,117.86
     # Make sure the rate is specified with enough precision to get the
     # correct conversion amount.
-    assert next(lines) == '63,805.00 RUB {=$0.0175204} @ $0.0175204\n'
+    check_fx_amount(config, lines, '63,805.00 RUB', '0.0175204', 'USD', '$')
     assert next(lines) == '$1,117.89\n'
     assert next(lines, None) is None