add test to parse_topic_1

test/sensors_test.gleam

@@ -16,3 +16,15 @@ pub fn file_read_test() {
   reading
   |> should.equal("Temperature 20.5 °C")
 }
+
+pub fn parse_topic_1_test() {
+  let json_string =
+    "{\"temp\":18.84,\"humidity\":28.690811,\"pressure\":944.67}"
+  let readings = sensors.parse_topic_1(json_string)
+  readings
+  |> should.equal([
+    sensors.SensorReading(sensor: sensors.Temperature, value: 18.84),
+    sensors.SensorReading(sensor: sensors.Humidity, value: 28.690811),
+    sensors.SensorReading(sensor: sensors.Pressure, value: 944.67),
+  ])
+}