test display with old databases

src/commands/display.rs

@@ -39,6 +39,7 @@ impl FromStr for Sheet {
     }
 }
 
+#[derive(Default)]
 pub struct Args {
     ids: bool,
     start: Option<DateTime<Utc>>,
@@ -96,3 +97,41 @@ impl<'a> Command<'a> for DisplayCommand {
         )
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    use crate::database::SqliteDatabase;
+    use crate::test_utils::PrettyString;
+
+    #[test]
+    fn display_as_local_time_if_previous_version() {
+        let args = Default::default();
+        let mut db = SqliteDatabase::from_path("assets/test_old_db.db").unwrap();
+        let mut out = Vec::new();
+        let mut err = Vec::new();
+        let config = Default::default();
+
+        DisplayCommand::handle(args, &mut db, &mut out, &mut err, &config).unwrap();
+
+        assert_eq!(PrettyString(&String::from_utf8_lossy(&out)), PrettyString("Timesheet: default
+    Day                Start      End        Duration Notes
+    Tue Jun 29, 2021   06:26:49 - 07:26:52    1:00:03 lets do some rust
+                                              1:00:03
+    ---------------------------------------------------------------------
+    Total                                     1:00:03
+"));
+
+        assert_eq!(
+            PrettyString(&String::from_utf8_lossy(&err)),
+            PrettyString("[WARNING] You are using the old timetrap format, it is advised that you update your database using t migrate")
+        );
+    }
+
+    #[test]
+    fn correctly_use_utc_if_new_version() {
+        assert!(false, "start with a newly created database");
+        assert!(false, "correctly display times in local timezone");
+    }
+}

src/formatters.rs

@@ -57,6 +57,12 @@ pub enum Formatter {
     Custom(String),
 }
 
+impl Default for Formatter {
+    fn default() -> Formatter {
+        Formatter::Text
+    }
+}
+
 impl Formatter {
     /// Prints the given entries to the specified output device.
     ///