diff --git a/tests/AdminConfigurationsTest.php b/tests/AdminConfigurationsTest.php
new file mode 100644
index 00000000..d0b6ae79
--- /dev/null
+++ b/tests/AdminConfigurationsTest.php
@@ -0,0 +1,217 @@
+<?php
+
+namespace Tests;
+
+use Cache;
+use Redis;
+use App\Models\User;
+use Illuminate\Foundation\Testing\WithoutMiddleware;
+use Illuminate\Foundation\Testing\DatabaseTransactions;
+
+class AdminConfigurationsTest extends BrowserKitTestCase
+{
+    use DatabaseTransactions;
+
+    protected function setUp(): void
+    {
+        // Do not use `WithoutMiddleware` trait
+        parent::setUp();
+        $this->actAs('admin');
+    }
+
+    public function testCustomize()
+    {
+        // Change color
+        $this->visit('/admin/customize')
+            ->select('skin-purple', 'color')
+            ->press('submit_color');
+        $this->assertEquals('skin-purple', option('color_scheme'));
+
+        $this->visit('/admin/customize')
+            ->type('url', 'home_pic_url')
+            ->type('url', 'favicon_url')
+            ->check('transparent_navbar')
+            ->select('1', 'copyright_prefer')
+            ->type('copyright', 'copyright_text')
+            ->press('submit_homepage');
+        $this->assertEquals('url', option('home_pic_url'));
+        $this->assertEquals('url', option('favicon_url'));
+        $this->assertTrue(option('transparent_navbar'));
+        $this->assertEquals('1', option('copyright_prefer'));
+        $this->assertEquals('copyright', option('copyright_text'));
+
+        $this->visit('/admin/customize')
+            ->type('css', 'custom_css')
+            ->type('js', 'custom_js')
+            ->press('submit_customJsCss');
+        $this->assertEquals('css', option('custom_css'));
+        $this->assertEquals('js', option('custom_js'));
+    }
+
+    public function testScore()
+    {
+        $this->visit('/admin/score')
+            ->type('4', 'score_per_storage')
+            ->type('6', 'private_score_per_storage')
+            ->type('8', 'score_per_closet_item')
+            ->uncheck('return_score')
+            ->type('12', 'score_per_player')
+            ->type('500', 'user_initial_score')
+            ->press('submit_rate');
+        $this->assertEquals('4', option('score_per_storage'));
+        $this->assertEquals('6', option('private_score_per_storage'));
+        $this->assertEquals('8', option('score_per_closet_item'));
+        $this->assertFalse(option('return_score'));
+        $this->assertEquals('12', option('score_per_player'));
+        $this->assertEquals('500', option('user_initial_score'));
+
+        $this->visit('/admin/score')
+            ->type('1', 'reporter_score_modification')
+            ->type('2', 'reporter_reward_score')
+            ->press('submit_report');
+        $this->assertEquals('1', option('reporter_score_modification'));
+        $this->assertEquals('2', option('reporter_reward_score'));
+
+        $this->visit('/admin/score')
+            ->type('233', 'sign_score_from')
+            ->type('666', 'sign_score_to')
+            ->type('7', 'sign_gap_time')
+            ->check('sign_after_zero')
+            ->press('submit_sign');
+        $this->assertEquals('233,666', option('sign_score'));
+        $this->assertEquals('7', option('sign_gap_time'));
+        $this->assertTrue(option('sign_after_zero'));
+
+        $this->visit('/admin/score')
+            ->type('1', 'score_award_per_texture')
+            ->uncheck('take_back_scores_after_deletion')
+            ->type('1', 'score_award_per_like')
+            ->press('submit_sharing');
+        $this->assertEquals('1', option('score_award_per_texture'));
+        $this->assertFalse(option('take_back_scores_after_deletion'));
+        $this->assertEquals('1', option('score_award_per_like'));
+    }
+
+    public function testOptions()
+    {
+        $this->visit('/admin/options')
+            ->type('My Site', 'site_name')
+            ->type('hi', 'site_description')
+            ->type('http://blessing.skin/', 'site_url')
+            ->uncheck('user_can_register')
+            ->type('8', 'regs_per_ip')
+            ->select('1', 'ip_get_method')
+            ->type('2048', 'max_upload_file_size')
+            ->see(trans(
+                'options.general.max_upload_file_size.hint',
+                ['size' => ini_get('upload_max_filesize')]
+            ))
+            ->select('cjk', 'player_name_rule')
+            ->type('/^([0-9]+)$/', 'custom_player_name_regexp')
+            ->select('1', 'api_type')
+            ->check('auto_del_invalid_texture')
+            ->uncheck('allow_downloading_texture')
+            ->select('404', 'status_code_for_private')
+            ->type('abc', 'texture_name_regexp')
+            ->type('policy', 'content_policy')
+            ->type('code', 'comment_script')
+            ->press('submit_general');
+        $this->assertEquals('My Site', option_localized('site_name'));
+        $this->assertEquals('hi', option_localized('site_description'));
+        $this->assertEquals('http://blessing.skin', option('site_url'));
+        $this->assertFalse(option('user_can_register'));
+        $this->assertEquals('8', option('regs_per_ip'));
+        $this->assertEquals('1', option('ip_get_method'));
+        $this->assertEquals('2048', option('max_upload_file_size'));
+        $this->assertEquals('cjk', option('player_name_rule'));
+        $this->assertEquals('/^([0-9]+)$/', option('custom_player_name_regexp'));
+        $this->assertEquals('1', option('api_type'));
+        $this->assertTrue(option('auto_del_invalid_texture'));
+        $this->assertFalse(option('allow_downloading_texture'));
+        $this->assertEquals('404', option('status_code_for_private'));
+        $this->assertEquals('abc', option('texture_name_regexp'));
+        $this->assertEquals('policy', option_localized('content_policy'));
+        $this->assertEquals('code', option('comment_script'));
+
+        $this->visit('/admin/options')
+            ->type('http://blessing.skin/index.php', 'site_url')
+            ->press('submit_general');
+        $this->assertEquals('http://blessing.skin', option('site_url'));
+
+        $this->visit('/admin/options')
+            ->type('announcement', 'announcement')
+            ->press('submit_announ');
+        $this->assertEquals('announcement', option_localized('announcement'));
+
+        $this->visit('/admin/options')
+            ->type('kw', 'meta_keywords')
+            ->type('desc', 'meta_description')
+            ->type('<!-- nothing -->', 'meta_extras')
+            ->press('submit_meta');
+        $this->visit('/')
+            ->see('<meta name="keywords" content="kw">')
+            ->see('<meta name="description" content="desc">')
+            ->see('<!-- nothing -->');
+
+        $this->visit('/admin/options')
+            ->type('key', 'recaptcha_sitekey')
+            ->type('secret', 'recaptcha_secretkey')
+            ->check('recaptcha_invisible')
+            ->press('submit_recaptcha');
+        $this->assertEquals('key', option('recaptcha_sitekey'));
+        $this->assertEquals('secret', option('recaptcha_secretkey'));
+        $this->assertTrue(option('recaptcha_invisible'));
+    }
+
+    public function testResource()
+    {
+        $this->visit('/admin/resource')
+            ->check('force_ssl')
+            ->uncheck('auto_detect_asset_url')
+            ->check('return_204_when_notfound')
+            ->type('0', 'cache_expire_time')
+            ->type('url/', 'cdn_address')
+            ->press('submit_resources');
+        $this->assertTrue(option('force_ssl'));
+        $this->assertFalse(option('auto_detect_asset_url'));
+        $this->assertTrue(option('return_204_when_notfound'));
+        $this->assertEquals('0', option('cache_expire_time'));
+        $this->visit('/')->see('url/app/');
+
+        $this->visit('/admin/resource')
+            ->type('', 'cdn_address')
+            ->press('submit_resources');
+        $this->visit('/')->dontSee('url/app/index.js');
+
+        $this->visit('/admin/resource')
+            ->check('enable_redis')
+            ->press('submit_redis');
+        $this->assertTrue(option('enable_redis'));
+
+        Redis::shouldReceive('ping')->once()->andReturn(true);
+        $this->visit('/admin/resource')->see(trans('options.redis.connect.success'));
+
+        Redis::shouldReceive('ping')->once()->andThrow(new \Exception('fake'));
+        $this->visit('/admin/resource')
+            ->see(trans('options.redis.connect.failed', ['msg' => 'fake']));
+
+        option(['enable_redis' => false]);
+
+        $this->visit('/admin/resource')
+            ->see(trans('options.cache.driver', ['driver' => config('cache.default')]))
+            ->check('enable_avatar_cache')
+            ->check('enable_preview_cache')
+            ->check('enable_json_cache')
+            ->check('enable_notfound_cache')
+            ->press('submit_cache');
+        $this->assertTrue(option('enable_avatar_cache'));
+        $this->assertTrue(option('enable_preview_cache'));
+        $this->assertTrue(option('enable_json_cache'));
+        $this->assertTrue(option('enable_notfound_cache'));
+
+        Cache::shouldReceive('flush');
+        $this->visit('/admin/resource')
+            ->click(trans('options.cache.clear'))
+            ->see(trans('options.cache.cleared'));
+    }
+}
diff --git a/tests/AdminControllerTest.php b/tests/AdminControllerTest.php
index 005ff99f..a52573b1 100644
--- a/tests/AdminControllerTest.php
+++ b/tests/AdminControllerTest.php
@@ -2,8 +2,6 @@
 
 namespace Tests;
 
-use Cache;
-use Redis;
 use App\Models\User;
 use App\Models\Player;
 use App\Models\Texture;
@@ -11,7 +9,7 @@ use Illuminate\Support\Str;
 use Illuminate\Foundation\Testing\WithoutMiddleware;
 use Illuminate\Foundation\Testing\DatabaseTransactions;
 
-class AdminControllerTest extends BrowserKitTestCase
+class AdminControllerTest extends TestCase
 {
     use DatabaseTransactions;
 
@@ -27,218 +25,24 @@ class AdminControllerTest extends BrowserKitTestCase
         factory(User::class)->create();
         factory(Texture::class)->create();
         $this->getJson('/admin/chart')
-            ->seeJson(['labels' => [
+            ->assertJson(['labels' => [
                 trans('admin.index.user-registration'),
                 trans('admin.index.texture-uploads'),
             ]])
-            ->seeJsonStructure(['labels', 'xAxis', 'data']);
+            ->assertJsonStructure(['labels', 'xAxis', 'data']);
     }
 
-    public function testCustomize()
-    {
-        // Change color
-        $this->visit('/admin/customize')
-            ->select('skin-purple', 'color')
-            ->press('submit_color');
-        $this->assertEquals('skin-purple', option('color_scheme'));
 
-        $this->visit('/admin/customize')
-            ->type('url', 'home_pic_url')
-            ->type('url', 'favicon_url')
-            ->check('transparent_navbar')
-            ->select('1', 'copyright_prefer')
-            ->type('copyright', 'copyright_text')
-            ->press('submit_homepage');
-        $this->assertEquals('url', option('home_pic_url'));
-        $this->assertEquals('url', option('favicon_url'));
-        $this->assertTrue(option('transparent_navbar'));
-        $this->assertEquals('1', option('copyright_prefer'));
-        $this->assertEquals('copyright', option('copyright_text'));
-
-        $this->visit('/admin/customize')
-            ->type('css', 'custom_css')
-            ->type('js', 'custom_js')
-            ->press('submit_customJsCss');
-        $this->assertEquals('css', option('custom_css'));
-        $this->assertEquals('js', option('custom_js'));
-    }
-
-    public function testScore()
-    {
-        $this->visit('/admin/score')
-            ->type('4', 'score_per_storage')
-            ->type('6', 'private_score_per_storage')
-            ->type('8', 'score_per_closet_item')
-            ->uncheck('return_score')
-            ->type('12', 'score_per_player')
-            ->type('500', 'user_initial_score')
-            ->press('submit_rate');
-        $this->assertEquals('4', option('score_per_storage'));
-        $this->assertEquals('6', option('private_score_per_storage'));
-        $this->assertEquals('8', option('score_per_closet_item'));
-        $this->assertFalse(option('return_score'));
-        $this->assertEquals('12', option('score_per_player'));
-        $this->assertEquals('500', option('user_initial_score'));
-
-        $this->visit('/admin/score')
-            ->type('1', 'reporter_score_modification')
-            ->type('2', 'reporter_reward_score')
-            ->press('submit_report');
-        $this->assertEquals('1', option('reporter_score_modification'));
-        $this->assertEquals('2', option('reporter_reward_score'));
-
-        $this->visit('/admin/score')
-            ->type('233', 'sign_score_from')
-            ->type('666', 'sign_score_to')
-            ->type('7', 'sign_gap_time')
-            ->check('sign_after_zero')
-            ->press('submit_sign');
-        $this->assertEquals('233,666', option('sign_score'));
-        $this->assertEquals('7', option('sign_gap_time'));
-        $this->assertTrue(option('sign_after_zero'));
-
-        $this->visit('/admin/score')
-            ->type('1', 'score_award_per_texture')
-            ->uncheck('take_back_scores_after_deletion')
-            ->type('1', 'score_award_per_like')
-            ->press('submit_sharing');
-        $this->assertEquals('1', option('score_award_per_texture'));
-        $this->assertFalse(option('take_back_scores_after_deletion'));
-        $this->assertEquals('1', option('score_award_per_like'));
-    }
-
-    public function testOptions()
-    {
-        $this->visit('/admin/options')
-            ->type('My Site', 'site_name')
-            ->type('hi', 'site_description')
-            ->type('http://blessing.skin/', 'site_url')
-            ->uncheck('user_can_register')
-            ->type('8', 'regs_per_ip')
-            ->select('1', 'ip_get_method')
-            ->type('2048', 'max_upload_file_size')
-            ->see(trans(
-                'options.general.max_upload_file_size.hint',
-                ['size' => ini_get('upload_max_filesize')]
-            ))
-            ->select('cjk', 'player_name_rule')
-            ->type('/^([0-9]+)$/', 'custom_player_name_regexp')
-            ->select('1', 'api_type')
-            ->check('auto_del_invalid_texture')
-            ->uncheck('allow_downloading_texture')
-            ->select('404', 'status_code_for_private')
-            ->type('abc', 'texture_name_regexp')
-            ->type('policy', 'content_policy')
-            ->type('code', 'comment_script')
-            ->press('submit_general');
-        $this->assertEquals('My Site', option_localized('site_name'));
-        $this->assertEquals('hi', option_localized('site_description'));
-        $this->assertEquals('http://blessing.skin', option('site_url'));
-        $this->assertFalse(option('user_can_register'));
-        $this->assertEquals('8', option('regs_per_ip'));
-        $this->assertEquals('1', option('ip_get_method'));
-        $this->assertEquals('2048', option('max_upload_file_size'));
-        $this->assertEquals('cjk', option('player_name_rule'));
-        $this->assertEquals('/^([0-9]+)$/', option('custom_player_name_regexp'));
-        $this->assertEquals('1', option('api_type'));
-        $this->assertTrue(option('auto_del_invalid_texture'));
-        $this->assertFalse(option('allow_downloading_texture'));
-        $this->assertEquals('404', option('status_code_for_private'));
-        $this->assertEquals('abc', option('texture_name_regexp'));
-        $this->assertEquals('policy', option_localized('content_policy'));
-        $this->assertEquals('code', option('comment_script'));
-
-        $this->visit('/admin/options')
-            ->type('http://blessing.skin/index.php', 'site_url')
-            ->press('submit_general');
-        $this->assertEquals('http://blessing.skin', option('site_url'));
-
-        $this->visit('/admin/options')
-            ->type('announcement', 'announcement')
-            ->press('submit_announ');
-        $this->assertEquals('announcement', option_localized('announcement'));
-
-        $this->visit('/admin/options')
-            ->type('kw', 'meta_keywords')
-            ->type('desc', 'meta_description')
-            ->type('<!-- nothing -->', 'meta_extras')
-            ->press('submit_meta');
-        $this->visit('/')
-            ->see('<meta name="keywords" content="kw">')
-            ->see('<meta name="description" content="desc">')
-            ->see('<!-- nothing -->');
-
-        $this->visit('/admin/options')
-            ->type('key', 'recaptcha_sitekey')
-            ->type('secret', 'recaptcha_secretkey')
-            ->check('recaptcha_invisible')
-            ->press('submit_recaptcha');
-        $this->assertEquals('key', option('recaptcha_sitekey'));
-        $this->assertEquals('secret', option('recaptcha_secretkey'));
-        $this->assertTrue(option('recaptcha_invisible'));
-    }
-
-    public function testResource()
-    {
-        $this->visit('/admin/resource')
-            ->check('force_ssl')
-            ->uncheck('auto_detect_asset_url')
-            ->check('return_204_when_notfound')
-            ->type('0', 'cache_expire_time')
-            ->type('url/', 'cdn_address')
-            ->press('submit_resources');
-        $this->assertTrue(option('force_ssl'));
-        $this->assertFalse(option('auto_detect_asset_url'));
-        $this->assertTrue(option('return_204_when_notfound'));
-        $this->assertEquals('0', option('cache_expire_time'));
-        $this->visit('/')->see('url/app/');
-
-        $this->visit('/admin/resource')
-            ->type('', 'cdn_address')
-            ->press('submit_resources');
-        $this->visit('/')->dontSee('url/app/index.js');
-
-        $this->visit('/admin/resource')
-            ->check('enable_redis')
-            ->press('submit_redis');
-        $this->assertTrue(option('enable_redis'));
-
-        Redis::shouldReceive('ping')->once()->andReturn(true);
-        $this->visit('/admin/resource')->see(trans('options.redis.connect.success'));
-
-        Redis::shouldReceive('ping')->once()->andThrow(new \Exception('fake'));
-        $this->visit('/admin/resource')
-            ->see(trans('options.redis.connect.failed', ['msg' => 'fake']));
-
-        option(['enable_redis' => false]);
-
-        $this->visit('/admin/resource')
-            ->see(trans('options.cache.driver', ['driver' => config('cache.default')]))
-            ->check('enable_avatar_cache')
-            ->check('enable_preview_cache')
-            ->check('enable_json_cache')
-            ->check('enable_notfound_cache')
-            ->press('submit_cache');
-        $this->assertTrue(option('enable_avatar_cache'));
-        $this->assertTrue(option('enable_preview_cache'));
-        $this->assertTrue(option('enable_json_cache'));
-        $this->assertTrue(option('enable_notfound_cache'));
-
-        Cache::shouldReceive('flush');
-        $this->visit('/admin/resource')
-            ->click(trans('options.cache.clear'))
-            ->see(trans('options.cache.cleared'));
-    }
 
     public function testUsers()
     {
-        $this->visit('/admin/users')->see(trans('general.user-manage'));
+        $this->get('/admin/users')->assertSee(trans('general.user-manage'));
     }
 
     public function testGetUserData()
     {
         $this->getJson('/admin/user-data')
-            ->seeJsonStructure([
+            ->assertJsonStructure([
                 'data' => [[
                     'uid',
                     'email',
@@ -253,7 +57,7 @@ class AdminControllerTest extends BrowserKitTestCase
 
         $user = factory(User::class)->create();
         $this->getJson('/admin/user-data?uid='.$user->uid)
-            ->seeJsonSubset([
+            ->assertJson([
                 'data' => [[
                     'uid' => $user->uid,
                     'email' => $user->email,
@@ -267,7 +71,7 @@ class AdminControllerTest extends BrowserKitTestCase
 
     public function testPlayers()
     {
-        $this->visit('/admin/players')->see(trans('general.player-manage'));
+        $this->get('/admin/players')->assertSee(trans('general.player-manage'));
     }
 
     public function testGetPlayerData()
@@ -276,7 +80,7 @@ class AdminControllerTest extends BrowserKitTestCase
         $user = $player->user;
 
         $this->getJson('/admin/player-data')
-            ->seeJsonStructure([
+            ->assertJsonStructure([
                 'data' => [[
                     'pid',
                     'uid',
@@ -288,7 +92,7 @@ class AdminControllerTest extends BrowserKitTestCase
             ]);
 
         $this->getJson('/admin/player-data?uid='.$user->uid)
-            ->seeJsonSubset([
+            ->assertJson([
                 'data' => [[
                     'pid' => $player->pid,
                     'uid' => $user->uid,
@@ -303,7 +107,7 @@ class AdminControllerTest extends BrowserKitTestCase
     {
         // Operate on an not-existed user
         $this->postJson('/admin/users')
-            ->seeJson([
+            ->assertJson([
                 'code' => 1,
                 'message' => trans('admin.users.operations.non-existent'),
             ]);
@@ -312,7 +116,7 @@ class AdminControllerTest extends BrowserKitTestCase
 
         // Operate without `action` field
         $this->postJson('/admin/users', ['uid' => $user->uid])
-            ->seeJson([
+            ->assertJson([
                 'code' => 1,
                 'message' => trans('admin.users.operations.invalid'),
             ]);
@@ -320,7 +124,7 @@ class AdminControllerTest extends BrowserKitTestCase
         // An admin operating on a super admin should be forbidden
         $superAdmin = factory(User::class, 'superAdmin')->create();
         $this->postJson('/admin/users', ['uid' => $superAdmin->uid])
-            ->seeJson([
+            ->assertJson([
                 'code' => 1,
                 'message' => trans('admin.users.operations.no-permission'),
             ]);
@@ -328,22 +132,20 @@ class AdminControllerTest extends BrowserKitTestCase
         // Action is `email` but without `email` field
         $this->postJson(
             '/admin/users',
-            ['uid' => $user->uid, 'action' => 'email'],
-            ['Accept' => 'application/json']
-        )->seeJsonStructure(['errors' => ['email']]);
+            ['uid' => $user->uid, 'action' => 'email']
+        )->assertJsonValidationErrors(['email']);
 
         // Action is `email` but with an invalid email address
         $this->postJson(
             '/admin/users',
-            ['uid' => $user->uid, 'action' => 'email', 'email' => 'invalid'],
-            ['Accept' => 'application/json']
-        )->seeJsonStructure(['errors' => ['email']]);
+            ['uid' => $user->uid, 'action' => 'email', 'email' => 'invalid']
+        )->assertJsonValidationErrors(['email']);
 
         // Using an existed email address
         $this->postJson(
             '/admin/users',
             ['uid' => $user->uid, 'action' => 'email', 'email' => $superAdmin->email]
-        )->seeJson([
+        )->assertJson([
             'code' => 1,
             'message' => trans('admin.users.operations.email.existed', ['email' => $superAdmin->email]),
         ]);
@@ -352,11 +154,11 @@ class AdminControllerTest extends BrowserKitTestCase
         $this->postJson(
             '/admin/users',
             ['uid' => $user->uid, 'action' => 'email', 'email' => 'a@b.c']
-        )->seeJson([
+        )->assertJson([
             'code' => 0,
             'message' => trans('admin.users.operations.email.success'),
         ]);
-        $this->seeInDatabase('users', [
+        $this->assertDatabaseHas('users', [
             'uid' => $user->uid,
             'email' => 'a@b.c',
         ]);
@@ -365,11 +167,11 @@ class AdminControllerTest extends BrowserKitTestCase
         $this->postJson(
             '/admin/users',
             ['uid' => $user->uid, 'action' => 'verification']
-        )->seeJson([
+        )->assertJson([
             'code' => 0,
             'message' => trans('admin.users.operations.verification.success'),
         ]);
-        $this->seeInDatabase('users', [
+        $this->assertDatabaseHas('users', [
             'uid' => $user->uid,
             'verified' => 0,
         ]);
@@ -377,26 +179,24 @@ class AdminControllerTest extends BrowserKitTestCase
         // Action is `nickname` but without `nickname` field
         $this->postJson(
             '/admin/users',
-            ['uid' => $user->uid, 'action' => 'nickname'],
-            ['Accept' => 'application/json']
-        )->seeJsonStructure(['errors' => ['nickname']]);
+            ['uid' => $user->uid, 'action' => 'nickname']
+        )->assertJsonValidationErrors(['nickname']);
 
         // Action is `nickname` but with an invalid nickname
         $this->postJson(
             '/admin/users',
-            ['uid' => $user->uid, 'action' => 'nickname', 'nickname' => '\\'],
-            ['Accept' => 'application/json']
-        )->seeJsonStructure(['errors' => ['nickname']]);
+            ['uid' => $user->uid, 'action' => 'nickname', 'nickname' => '\\']
+        )->assertJsonValidationErrors(['nickname']);
 
         // Set nickname successfully
         $this->postJson(
             '/admin/users',
             ['uid' => $user->uid, 'action' => 'nickname', 'nickname' => 'nickname']
-        )->seeJson([
+        )->assertJson([
             'code' => 0,
             'message' => trans('admin.users.operations.nickname.success', ['new' => 'nickname']),
         ]);
-        $this->seeInDatabase('users', [
+        $this->assertDatabaseHas('users', [
             'uid' => $user->uid,
             'nickname' => 'nickname',
         ]);
@@ -404,29 +204,26 @@ class AdminControllerTest extends BrowserKitTestCase
         // Action is `password` but without `password` field
         $this->postJson(
             '/admin/users',
-            ['uid' => $user->uid, 'action' => 'password'],
-            ['Accept' => 'application/json']
-        )->seeJsonStructure(['errors' => ['password']]);
+            ['uid' => $user->uid, 'action' => 'password']
+        )->assertJsonValidationErrors(['password']);
 
         // Set a too short password
         $this->postJson(
             '/admin/users',
-            ['uid' => $user->uid, 'action' => 'password', 'password' => '1'],
-            ['Accept' => 'application/json']
-        )->seeJsonStructure(['errors' => ['password']]);
+            ['uid' => $user->uid, 'action' => 'password', 'password' => '1']
+        )->assertJsonValidationErrors(['password']);
 
         // Set a too long password
         $this->postJson(
             '/admin/users',
-            ['uid' => $user->uid, 'action' => 'password', 'password' => Str::random(17)],
-            ['Accept' => 'application/json']
-        )->seeJsonStructure(['errors' => ['password']]);
+            ['uid' => $user->uid, 'action' => 'password', 'password' => Str::random(17)]
+        )->assertJsonValidationErrors(['password']);
 
         // Set password successfully
         $this->postJson(
             '/admin/users',
             ['uid' => $user->uid, 'action' => 'password', 'password' => '12345678']
-        )->seeJson([
+        )->assertJson([
             'code' => 0,
             'message' => trans('admin.users.operations.password.success'),
         ]);
@@ -436,26 +233,24 @@ class AdminControllerTest extends BrowserKitTestCase
         // Action is `score` but without `score` field
         $this->postJson(
             '/admin/users',
-            ['uid' => $user->uid, 'action' => 'score'],
-            ['Accept' => 'application/json']
-        )->seeJsonStructure(['errors' => ['score']]);
+            ['uid' => $user->uid, 'action' => 'score']
+        )->assertJsonValidationErrors(['score']);
 
         // Action is `score` but with an not-an-integer value
         $this->postJson(
             '/admin/users',
-            ['uid' => $user->uid, 'action' => 'score', 'score' => 'string'],
-            ['Accept' => 'application/json']
-        )->seeJsonStructure(['errors' => ['score']]);
+            ['uid' => $user->uid, 'action' => 'score', 'score' => 'string']
+        )->assertJsonValidationErrors(['score']);
 
         // Set score successfully
         $this->postJson(
             '/admin/users',
             ['uid' => $user->uid, 'action' => 'score', 'score' => 123]
-        )->seeJson([
+        )->assertJson([
             'code' => 0,
             'message' => trans('admin.users.operations.score.success'),
         ]);
-        $this->seeInDatabase('users', [
+        $this->assertDatabaseHas('users', [
             'uid' => $user->uid,
             'score' => 123,
         ]);
@@ -465,7 +260,7 @@ class AdminControllerTest extends BrowserKitTestCase
             'uid' => $user->uid,
             'action' => 'permission',
             'permission' => -2,
-        ])->seeJsonStructure(['errors' => ['permission']]);
+        ])->assertJsonValidationErrors(['permission']);
         $user = User::find($user->uid);
         $this->assertEquals(User::NORMAL, $user->permission);
 
@@ -474,7 +269,7 @@ class AdminControllerTest extends BrowserKitTestCase
             'uid' => $user->uid,
             'action' => 'permission',
             'permission' => -1,
-        ])->seeJson([
+        ])->assertJson([
             'code' => 0,
             'message' => trans('admin.users.operations.permission'),
         ]);
@@ -483,7 +278,7 @@ class AdminControllerTest extends BrowserKitTestCase
 
         // Delete a user
         $this->postJson('/admin/users', ['uid' => $user->uid, 'action' => 'delete'])
-            ->seeJson([
+            ->assertJson([
                 'code' => 0,
                 'message' => trans('admin.users.operations.delete.success'),
             ]);
@@ -496,7 +291,7 @@ class AdminControllerTest extends BrowserKitTestCase
 
         // Operate on a not-existed player
         $this->postJson('/admin/players', ['pid' => -1])
-            ->seeJson([
+            ->assertJson([
                 'code' => 1,
                 'message' => trans('general.unexistent-player'),
             ]);
@@ -506,7 +301,7 @@ class AdminControllerTest extends BrowserKitTestCase
         $this->postJson(
             '/admin/players',
             ['pid' => factory(Player::class)->create(['uid' => $admin->uid])->pid]
-        )->seeJson([
+        )->assertJson([
             'code' => 1,
             'message' => trans('admin.players.no-permission'),
         ]);
@@ -514,7 +309,7 @@ class AdminControllerTest extends BrowserKitTestCase
         $this->postJson(
             '/admin/players',
             ['pid' => factory(Player::class)->create(['uid' => $superAdmin->uid])->pid]
-        )->seeJson([
+        )->assertJson([
             'code' => 1,
             'message' => trans('admin.players.no-permission'),
         ]);
@@ -522,7 +317,7 @@ class AdminControllerTest extends BrowserKitTestCase
         $this->actingAs($admin)->postJson(
             '/admin/players',
             ['pid' => factory(Player::class)->create(['uid' => $admin->uid])->pid]
-        )->seeJson([
+        )->assertJson([
             'code' => 1,
             'message' => trans('admin.users.operations.invalid'),
         ]);
@@ -531,18 +326,14 @@ class AdminControllerTest extends BrowserKitTestCase
         $this->postJson('/admin/players', [
             'pid' => $player->pid,
             'action' => 'texture',
-        ], [
-            'Accept' => 'application/json',
-        ])->seeJsonStructure(['errors' => ['type']]);
+        ])->assertJsonValidationErrors(['type']);
 
         // Change texture without `tid` field
         $this->postJson('/admin/players', [
             'pid' => $player->pid,
             'action' => 'texture',
             'type' => 'skin',
-        ], [
-            'Accept' => 'application/json',
-        ])->seeJsonStructure(['errors' => ['tid']]);
+        ])->assertJsonValidationErrors(['tid']);
 
         // Change texture with a not-integer value
         $this->postJson('/admin/players', [
@@ -550,9 +341,7 @@ class AdminControllerTest extends BrowserKitTestCase
             'action' => 'texture',
             'type' => 'skin',
             'tid' => 'string',
-        ], [
-            'Accept' => 'application/json',
-        ])->seeJsonStructure(['errors' => ['tid']]);
+        ])->assertJsonValidationErrors(['tid']);
 
         // Invalid texture
         $this->postJson('/admin/players', [
@@ -560,7 +349,7 @@ class AdminControllerTest extends BrowserKitTestCase
             'action' => 'texture',
             'type' => 'skin',
             'tid' => -1,
-        ])->seeJson([
+        ])->assertJson([
             'code' => 1,
             'message' => trans('admin.players.textures.non-existent', ['tid' => -1]),
         ]);
@@ -574,7 +363,7 @@ class AdminControllerTest extends BrowserKitTestCase
             'action' => 'texture',
             'type' => 'skin',
             'tid' => $skin->tid,
-        ])->seeJson([
+        ])->assertJson([
             'code' => 0,
             'message' => trans('admin.players.textures.success', ['player' => $player->name]),
         ]);
@@ -587,7 +376,7 @@ class AdminControllerTest extends BrowserKitTestCase
             'action' => 'texture',
             'type' => 'cape',
             'tid' => $cape->tid,
-        ])->seeJson([
+        ])->assertJson([
             'code' => 0,
             'message' => trans('admin.players.textures.success', ['player' => $player->name]),
         ]);
@@ -600,7 +389,7 @@ class AdminControllerTest extends BrowserKitTestCase
             'action' => 'texture',
             'type' => 'skin',
             'tid' => 0,
-        ])->seeJson([
+        ])->assertJson([
             'code' => 0,
             'message' => trans('admin.players.textures.success', ['player' => $player->name]),
         ]);
@@ -613,7 +402,7 @@ class AdminControllerTest extends BrowserKitTestCase
             'action' => 'texture',
             'type' => 'cape',
             'tid' => 0,
-        ])->seeJson([
+        ])->assertJson([
             'code' => 0,
             'message' => trans('admin.players.textures.success', ['player' => $player->name]),
         ]);
@@ -624,25 +413,21 @@ class AdminControllerTest extends BrowserKitTestCase
         $this->postJson('/admin/players', [
             'pid' => $player->pid,
             'action' => 'owner',
-        ], [
-            'Accept' => 'application/json',
-        ])->seeJsonStructure(['errors' => ['uid']]);
+        ])->assertJsonValidationErrors(['uid']);
 
         // Change owner with a not-integer `uid` value
         $this->postJson('/admin/players', [
             'pid' => $player->pid,
             'action' => 'owner',
             'uid' => 'string',
-        ], [
-            'Accept' => 'application/json',
-        ])->seeJsonStructure(['errors' => ['uid']]);
+        ])->assertJsonValidationErrors(['uid']);
 
         // Change owner to a not-existed user
         $this->postJson('/admin/players', [
             'pid' => $player->pid,
             'action' => 'owner',
             'uid' => -1,
-        ])->seeJson([
+        ])->assertJson([
             'code' => 1,
             'message' => trans('admin.users.operations.non-existent'),
         ]);
@@ -653,7 +438,7 @@ class AdminControllerTest extends BrowserKitTestCase
             'pid' => $player->pid,
             'action' => 'owner',
             'uid' => $user->uid,
-        ])->seeJson([
+        ])->assertJson([
             'code' => 0,
             'message' => trans(
                 'admin.players.owner.success',
@@ -665,16 +450,14 @@ class AdminControllerTest extends BrowserKitTestCase
         $this->postJson('/admin/players', [
             'pid' => $player->pid,
             'action' => 'name',
-        ], [
-            'Accept' => 'application/json',
-        ])->seeJsonStructure(['errors' => ['name']]);
+        ])->assertJsonValidationErrors(['name']);
 
         // Rename a player successfully
         $this->postJson('/admin/players', [
             'pid' => $player->pid,
             'action' => 'name',
             'name' => 'new_name',
-        ])->seeJson([
+        ])->assertJson([
             'code' => 0,
             'message' => trans('admin.players.name.success', ['player' => 'new_name']),
         ]);
@@ -685,7 +468,7 @@ class AdminControllerTest extends BrowserKitTestCase
             'pid' => $player->pid,
             'action' => 'name',
             'name' => 'abc',
-        ])->seeJson(['code' => 0]);
+        ])->assertJson(['code' => 0]);
         $player->refresh();
         $this->assertEquals('abc', $player->user->nickname);
 
@@ -693,7 +476,7 @@ class AdminControllerTest extends BrowserKitTestCase
         $this->postJson('/admin/players', [
             'pid' => $player->pid,
             'action' => 'delete',
-        ])->seeJson([
+        ])->assertJson([
             'code' => 0,
             'message' => trans('admin.players.delete.success'),
         ]);