diff --git a/tests/test_reports_balance.py b/tests/test_reports_balance.py
index 5855ba35049e5f59fb3f92d81db24a665282d081..876c04bac72224fd53bc200ec0f8cae63790bcf7 100644
--- a/tests/test_reports_balance.py
+++ b/tests/test_reports_balance.py
@@ -127,6 +127,25 @@ def test_le_zero(balance_map_kwargs, expected):
     balance = core.Balance(amounts.items())
     assert balance.le_zero() == expected
 
+@pytest.mark.parametrize('balance_map_kwargs', [
+    {},
+    {'USD': 0},
+    {'EUR': 10},
+    {'JPY': 20, 'BRL': 30},
+    {'EUR': -15},
+    {'JPY': -25, 'BRL': -35},
+    {'JPY': 40, 'USD': 0, 'EUR': -50},
+])
+def test_abs(balance_map_kwargs):
+    amounts = testutil.balance_map(**balance_map_kwargs)
+    actual = abs(core.Balance(amounts.items()))
+    assert set(actual) == set(balance_map_kwargs)
+    abs_amounts = testutil.balance_map(**{
+        key: abs(number) for key, number in balance_map_kwargs.items()
+    })
+    for key in balance_map_kwargs:
+        assert actual[key] == abs_amounts[key]
+
 @pytest.mark.parametrize('balance_map_kwargs', [
     {},
     {'USD': 0},