diff --git a/tests/test_datatype.py b/tests/test_datatype.py
index 326d9c5..a42b037 100644
--- a/tests/test_datatype.py
+++ b/tests/test_datatype.py
@@ -9,6 +9,10 @@ class TestDataTypes(unittest.TestCase):
         int16_buffer = froniusreg.int16.encode_to_buffer(1024)
         assert int16_buffer == [b"\x04\x00"]
 
+    def test_int16_decode(self):
+        int16_register = [0x0, 0x1, 0x0, 0x0, 0x0, 0x5, 0x1, 0x3, 0x2, 0x0, 0x0]
+        output = froniusreg.int16.decode_from_register(int16_register)
+        assert output == 0
 
 if __name__ == "__main__":
     unittest.main()