Add unit tests for main model parts (#310)

Add tests for following models:
- Blog
- Instance
- Media
- User

plume-models/tests/lib.rs

@@ -1,15 +1,11 @@
 extern crate diesel;
-#[macro_use] extern crate diesel_migrations;
+#[macro_use]
+extern crate diesel_migrations;
 
 extern crate plume_models;
 
 use diesel::Connection;
-use plume_models::{
-	DATABASE_URL,
-    Connection as Conn,
-    instance::*,
-    safe_string::SafeString,
-};
+use plume_models::{Connection as Conn, DATABASE_URL};
 
 #[cfg(feature = "sqlite")]
 embed_migrations!("../migrations/sqlite");
@@ -24,24 +20,7 @@ fn db() -> Conn {
 }
 
 #[test]
-fn instance_insert() {
+fn empty_test() {
     let conn = &db();
-	conn.test_transaction::<_, (), _>(|| {
-        Instance::insert(conn, NewInstance {
-            default_license: "WTFPL".to_string(),
-            local: true,
-            long_description: SafeString::new("This is my instance."),
-            long_description_html: "<p>This is my instance</p>".to_string(),
-            short_description: SafeString::new("My instance."),
-            short_description_html: "<p>My instance</p>".to_string(),
-            name: "My instance".to_string(),
-            open_registrations: true,
-            public_domain: "plu.me".to_string(),
-        });
-        let inst = Instance::get_local(conn);
-        assert!(inst.is_some());
-        let inst = inst.unwrap();
-        assert_eq!(inst.name, "My instance".to_string());
-		Ok(())
-    });
+    conn.test_transaction::<_, (), _>(|| Ok(()));
 }