diff --git a/tests/test_unit_tx.py b/tests/test_unit_tx.py
new file mode 100644
index 0000000000000000000000000000000000000000..f2e6375d8142cfd67ca52fd9a4cad8b8537393f2
--- /dev/null
+++ b/tests/test_unit_tx.py
@@ -0,0 +1,14 @@
+import pytest
+
+from silkaj.tx import truncBase
+
+
+@pytest.mark.parametrize('amount,base,expected', [
+        (0, 0, 0),
+        (10, 2, 0),
+        (100, 2, 100),
+        (306, 2, 300),
+        (3060, 3, 3000),
+])
+def test_truncBase(amount, base, expected):
+    assert truncBase(amount, base) == expected