diff --git a/tests/tests_unit/test_exchange_rates.py b/tests/tests_unit/test_exchange_rates.py
index b5080af..a205e12 100644
--- a/tests/tests_unit/test_exchange_rates.py
+++ b/tests/tests_unit/test_exchange_rates.py
@@ -27,6 +27,20 @@ def test_exchange_rate_creation_works():
     assert a_rate.rate_date == datetime.date.today()
 
 
+def test_exchange_rate_can_hold_8_decimal_positions():
+    a_rate = ExchangeRate(
+        from_currency=Currency.USD,
+        to_currency=Currency.EUR,
+        rate=Decimal("1.12345678"),
+        rate_date=datetime.date.today(),
+    )
+
+    assert a_rate.from_currency.value == "USD"
+    assert a_rate.to_currency.value == "EUR"
+    assert a_rate.rate.amount == Decimal("1.12345678")
+    assert a_rate.rate_date == datetime.date.today()
+
+
 def test_descriptor_builds_properly():
 
     a_rate = ExchangeRate(