Test for string16 added

src/pyfroniusreg/froniusreg.py

@@ -7,6 +7,7 @@ from pymodbus.constants import Endian
 from pymodbus.payload import BinaryPayloadDecoder, BinaryPayloadBuilder
 from pymodbus.client.base import ModbusBaseClient
 
+
 class DataType:
     def __init__(self, width, decode, add):
         width: int
@@ -38,6 +39,7 @@ def decode_string4(decoder) -> str:
     except UnicodeDecodeError:
         return decoder.decode_string(4)
 
+
 def decode_string8(decoder) -> str:
     try:
         return str(decoder.decode_string(8).decode("utf-8"))
@@ -152,5 +154,6 @@ class ScaledFroniusReg:
 
     def set(self, modbus_client: ModbusBaseClient, value: [int, float, str]):
         return self.value_register.set(
-            modbus_client, value / 10 ** self.scale_register.get(modbus_client),
+            modbus_client,
+            value / 10 ** self.scale_register.get(modbus_client),
         )

tests/test_datatype.py

@@ -14,5 +14,15 @@ class TestDataTypes(unittest.TestCase):
         output = froniusreg.int16.decode_from_register(int16_register)
         assert output == 0
 
+    def test_string16(self):
+        string_buffer = froniusreg.string16.encode_to_buffer("Fronius")
+        assert string_buffer == [b"Fr", b"on", b"iu", b"s\x00"]
+
+    def test_string_16_decode(self):
+        int_register = [18034, 28526, 26997, 29440, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
+        output = froniusreg.string16.decode_from_register(int_register)
+        expectation = "Fronius" + 9 * '\x00'
+        assert output == expectation
+
 if __name__ == "__main__":
     unittest.main()