CAN: Add unit tests

Author: eldruin

src/can/id.rs

@@ -101,3 +101,54 @@ impl From<ExtendedId> for Id {
         Id::Extended(id)
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn standard_id_new() {
+        assert_eq!(
+            StandardId::new(StandardId::MAX.as_raw()),
+            Some(StandardId::MAX)
+        );
+    }
+
+    #[test]
+    fn standard_id_new_out_of_range() {
+        assert_eq!(StandardId::new(StandardId::MAX.as_raw() + 1), None);
+    }
+
+    #[test]
+    fn standard_id_new_unchecked_out_of_range() {
+        let id = StandardId::MAX.as_raw() + 1;
+        assert_eq!(unsafe { StandardId::new_unchecked(id) }, StandardId(id));
+    }
+
+    #[test]
+    fn extended_id_new() {
+        assert_eq!(
+            ExtendedId::new(ExtendedId::MAX.as_raw()),
+            Some(ExtendedId::MAX)
+        );
+    }
+
+    #[test]
+    fn extended_id_new_out_of_range() {
+        assert_eq!(ExtendedId::new(ExtendedId::MAX.as_raw() + 1), None);
+    }
+
+    #[test]
+    fn extended_id_new_unchecked_out_of_range() {
+        let id = ExtendedId::MAX.as_raw() + 1;
+        assert_eq!(unsafe { ExtendedId::new_unchecked(id) }, ExtendedId(id));
+    }
+
+    #[test]
+    fn get_standard_id_from_extended_id() {
+        assert_eq!(
+            Some(ExtendedId::MAX.standard_id()),
+            StandardId::new((ExtendedId::MAX.0 >> 18) as u16)
+        );
+    }
+}