feat(util/time): cleanup, document and add tests

Drop the unused `dur` function, it's nowhere found in the code.

Document both Timebase and Timebase::now()

Add tests

Signed-off-by: Paul Spooren <mail@aparcar.org>

util/src/time.rs

@@ -1,20 +1,53 @@
-use std::time::{Duration, Instant};
+use std::time::Instant;
+
+/// A timebase.
+///
+/// This is a simple wrapper around `std::time::Instant` that provides a
+/// convenient way to get the seconds elapsed since the creation of the
+/// `Timebase` instance.
 
 #[derive(Clone, Debug)]
 pub struct Timebase(Instant);
 
 impl Default for Timebase {
+    // TODO: Implement new()?
     fn default() -> Self {
         Self(Instant::now())
     }
 }
 
 impl Timebase {
+    /// Returns the seconds elapsed since the creation of the `Timebase`
     pub fn now(&self) -> f64 {
         self.0.elapsed().as_secs_f64()
     }
+}
 
-    pub fn dur(&self, t: f64) -> Duration {
-        Duration::from_secs_f64(t)
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::thread::sleep;
+    use std::time::Duration;
+
+    #[test]
+    fn test_timebase() {
+        let timebase = Timebase::default();
+        let now = timebase.now();
+        assert!(now > 0.0);
+    }
+
+    #[test]
+    fn test_timebase_clone() {
+        let timebase = Timebase::default();
+        let timebase_clone = timebase.clone();
+        assert_eq!(timebase.0, timebase_clone.0);
+    }
+
+    #[test]
+    fn test_timebase_sleep() {
+        let timebase = Timebase::default();
+        sleep(Duration::from_secs(1));
+        let now = timebase.now();
+        assert!(now > 1.0);
     }
 }