Add timer_unit_tests to separate file

tests/timer_unit_tests.rs

@@ -0,0 +1,37 @@
+#[cfg(all(test, not(feature = "mips64_timer_tests")))]
+mod timer_unit_tests {
+    use martos::timer::Timer;
+    use std::time::Duration;
+
+    #[test]
+    /// Tests setup timer function and getting counter value (bad unit test).
+    fn test_setup_timer() {
+        Timer::setup_timer();
+        let timer = Timer::get_timer(0)
+            .expect("The timer is already active or a timer with this index does not exist.");
+        assert_eq!(timer.get_time().as_micros(), 0);
+        timer.release_timer();
+    }
+
+    #[test]
+    /// Tests loop timer function.
+    fn test_loop_timer() {
+        Timer::setup_timer();
+        let mut timer = Timer::get_timer(0)
+            .expect("The timer is already active or a timer with this index does not exist.");
+        timer.loop_timer();
+        assert_eq!(timer.get_time().as_micros(), 0);
+        timer.release_timer();
+    }
+
+    #[test]
+    /// Tests stop condition timer function.
+    fn test_stop_condition_timer() {
+        let timer = Timer::get_timer(0)
+            .expect("The timer is already active or a timer with this index does not exist.");
+        timer.change_period_timer(Duration::new(10, 0));
+        timer.start_timer();
+        assert!(!timer.stop_condition_timer());
+        timer.release_timer();
+    }
+}