add tests

packages/hydrooj/src/entry/setup.ts

@@ -52,12 +52,6 @@ class Loader {
                         <input name="name" type="text" value="hydro">
                       </label>
                     </div></div>
-                    <div class="row"><div class="columns">
-                      <label class="inverse material textbox">
-                        {{ _('Table Prefix') }}
-                        <input name="prefix" type="text" placeholder="{{ _('Leave blank if none') }}">>
-                      </label>
-                    </div></div>
                     <div class="row"><div class="columns">
                       <label class="inverse material textbox">
                         {{ _('Database Username') }}
@@ -109,7 +103,7 @@ async function get(ctx: Context) {
 
 async function post(ctx: Context) {
     const {
-        host, port, name, username, password, prefix,
+        host, port, name, username, password,
     } = ctx.request.body;
     let mongourl = 'mongodb://';
     if (username) mongourl += `${username}:${password}@`;
@@ -119,7 +113,7 @@ async function post(ctx: Context) {
             useNewUrlParser: true, useUnifiedTopology: true,
         });
         const db = Database.db(name);
-        const coll = prefix ? db.collection('system') : db.collection(`${prefix}.system`);
+        const coll = db.collection('system');
         await Promise.all([
             coll.updateOne(
                 { _id: 'server.host' },