Add tests for dbstate.

src/db/sqlite/state.rs

@@ -13,6 +13,13 @@ impl DbState for Database {
     }
 
     async fn set_device_id(&self, device_id: &str) -> Result<(), DataError> {
+        // This will have to be updated if we ever add another column
+        // to this table!
+        sqlx::query("DELETE FROM bot_state")
+            .execute(&self.conn)
+            .await
+            .ok();
+
         sqlx::query(
             r#"INSERT INTO bot_state
                       (device_id)
@@ -25,3 +32,59 @@ impl DbState for Database {
         Ok(())
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::super::DbState;
+    use super::*;
+
+    async fn create_db() -> Database {
+        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
+        crate::db::sqlite::migrator::migrate(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        Database::new(db_path.path().to_str().unwrap())
+            .await
+            .unwrap()
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn set_and_get_device_id() {
+        let db = create_db().await;
+
+        db.set_device_id("device_id")
+            .await
+            .expect("Could not set device ID");
+
+        let device_id = db.get_device_id().await.expect("Could not get device ID");
+
+        assert!(device_id.is_some());
+        assert_eq!(device_id.unwrap(), "device_id");
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn no_device_id_set_returns_none() {
+        let db = create_db().await;
+        let device_id = db.get_device_id().await.expect("Could not get device ID");
+        assert!(device_id.is_none());
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn can_update_device_id() {
+        let db = create_db().await;
+
+        db.set_device_id("device_id")
+            .await
+            .expect("Could not set device ID");
+
+        db.set_device_id("device_id2")
+            .await
+            .expect("Could not set device ID");
+
+        let device_id = db.get_device_id().await.expect("Could not get device ID");
+
+        assert!(device_id.is_some());
+        assert_eq!(device_id.unwrap(), "device_id2");
+    }
+}