add structs for Thermometer and PowerSocket; add Device trait

smart-house/src/device/thermometer.rs

@@ -0,0 +1,45 @@
+#![allow(unused)]
+
+use std::fmt::Display;
+
+pub struct Thermometer {
+    temperature: f32,
+}
+
+impl Thermometer {
+    pub fn new(temperature: f32) -> Self {
+        Self { temperature }
+    }
+
+    pub fn get_temperature(&self) -> f32 {
+        self.temperature
+    }
+
+    pub fn display(&self) -> impl Display {
+        format!("Thermometer[ {:02.1} ]", self.get_temperature())
+    }
+}
+
+impl super::Device for Thermometer {
+    fn print_status(&self) {
+        println!("{}", self.display())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn smoke_test() {
+        let thermometer = Thermometer::new(20.0);
+        assert_eq!(thermometer.temperature, 20.0);
+        assert_eq!(thermometer.get_temperature(), 20.0);
+    }
+
+    #[test]
+    fn display_test() {
+        assert_eq!(format!("{}", Thermometer::new(19.550).display()), "Thermometer[ 19.5 ]");
+        assert_eq!(format!("{}", Thermometer::new(19.551).display()), "Thermometer[ 19.6 ]");
+    }
+}