diff --git a/src/Site/Test/LibAuth.php b/src/Site/Test/LibAuth.php
new file mode 100644
index 0000000..40386d1
--- /dev/null
+++ b/src/Site/Test/LibAuth.php
@@ -0,0 +1,223 @@
+<?php
+namespace Site\Test;
+
+require_once __DIR__.'/../../../autoload.php';
+
+use Site\Lib\Tester;
+use Site\Lib\Auth;
+
+$test = new Tester([
+  'colorOutput' => true,
+  'verboseOutput' => true
+]);
+
+$test->describe('ユーザー登録', function($test): void {
+  $test->it('アカウントを作成出来るはず', function($test): void {
+    $user = "admin1234";
+    $pass = "testTEST1234!#$%@[]:;";
+    $passVerify = "testTEST1234!#$%@[]:;";
+    $email = "test@076.co.jp";
+
+    $auth = new Auth();
+    $res = $auth->mkUser($user, $pass, $passVerify, $email);
+
+    $expect = true;
+
+    $test->assertNotNull($res);
+    $test->assertEquals($res->isSuccess, $expect);
+  });
+
+  $test->it('空フィールドでアカウントを作成出来ないはず', function($test): void {
+    $user = "";
+    $pass = "testTEST1234!#$%@[]:;";
+    $passVerify = "testTEST1234!#$%@[]:;";
+    $email = "test@076.ne.jp";
+
+    $auth = new Auth();
+    $res = $auth->mkUser($user, $pass, $passVerify, $email);
+
+    $expect = 'エラー：ユーザー名をご入力下さい。'.'<br />';
+
+    $test->assertNotNull($res);
+    $test->assertEquals($res->message, $expect);
+
+    $user = "admin5678";
+    $pass = "";
+    $res = $auth->mkUser($user, $pass, $passVerify, $email);
+
+    $expect = 'エラー：パスワードをご入力下さい。'.'<br />';
+
+    $test->assertNotNull($res);
+    $test->assertEquals($res->message, $expect);
+
+    $pass = "testTEST1234!#$%@[]:;";
+    $email = "";
+    $res = $auth->mkUser($user, $pass, $passVerify, $email);
+
+    $expect = 'エラー：メールアドレスをご入力下さい。'.'<br />';
+
+    $test->assertNotNull($res);
+    $test->assertEquals($res->message, $expect);
+  });
+
+  $test->it('既にユーザー名やメールアドレスが存在するアカウントを作成出来ないはず', function($test): void {
+    $user = "admin1234";
+    $pass = "testTEST1234!#$%@[]:;";
+    $passVerify = "testTEST1234!#$%@[]:;";
+    $email = "test@076.ne.jp";
+
+    $auth = new Auth();
+    $res = $auth->mkUser($user, $pass, $passVerify, $email);
+
+    $expect = 'ユーザー「admin1234」は既に存在します。'.'<br />';
+
+    $test->assertNotNull($res);
+    $test->assertEquals($res->message, $expect);
+
+    $user = "admin5678";
+    $email = "test@076.co.jp";
+    $res = $auth->mkUser($user, $pass, $passVerify, $email);
+
+    $expect = 'ユーザー「test@076.co.jp」は既に存在します。'.'<br />';
+
+    $test->assertNotNull($res);
+    $test->assertEquals($res->message, $expect);
+  });
+
+  $test->it('一致しない、短い、又は不安なパスワードでアカウントを作成出来ないはず', function($test): void {
+    $user = "admin5678";
+    $pass = "testtest1234!#$%@[]:;";
+    $passVerify = "testTEST1234!#$%@[]:;";
+    $email = "test@076.ne.jp";
+
+    $auth = new Auth();
+    $res = $auth->mkUser($user, $pass, $passVerify, $email);
+
+    $expect = 'エラー：パスワードは一致していません。'.'<br />';
+
+    $test->assertNotNull($res);
+    $test->assertEquals($res->message, $expect);
+
+    $pass = "testTEST1234";
+    $passVerify = "testTEST1234";
+    $res = $auth->mkUser($user, $pass, $passVerify, $email);
+
+    $expect = 'エラー：パスワードは20以上をご入力下さい。'.'<br />';
+
+    $test->assertNotNull($res);
+    $test->assertEquals($res->message, $expect);
+
+    $pass = "testTEST1234testTEST";
+    $passVerify = "testTEST1234testTEST";
+    $res = $auth->mkUser($user, $pass, $passVerify, $email);
+
+    $expect = 'エラー：パスワードは2つ以上の大文字、2つ以上の小文字、2つ以上の数字、及び2つ以上の特別文字を含む事が必須です。'.'<br />';
+
+    $test->assertNotNull($res);
+    $test->assertEquals($res->message, $expect);
+  });
+
+  $test->it('不正なメールアドレスでアカウントを作成出来ないはず', function($test): void {
+    $user = "admin5678";
+    $pass = "testTEST1234!#$%@[]:;";
+    $passVerify = "testTEST1234!#$%@[]:;";
+    $email = "test@076.niggerballs";
+
+    $auth = new Auth();
+    $res = $auth->mkUser($user, $pass, $passVerify, $email);
+
+    $expect = 'エラー：メールアドレスは不正です。'.'<br />';
+
+    $test->assertNotNull($res);
+    $test->assertEquals($res->message, $expect);
+
+    $email = "test@076";
+    $res = $auth->mkUser($user, $pass, $passVerify, $email);
+
+    $expect = 'エラー：メールアドレスは不正です。'.'<br />';
+
+    $test->assertNotNull($res);
+    $test->assertEquals($res->message, $expect);
+  });
+
+  // ユーザーの削除
+  $users = scandir(ROOT.'/data/user');
+  $userFile = '';
+  foreach ($users as $u) {
+    if (str_contains($u, 'admin1234')) {
+      $userFile = $u;
+      break;
+    }
+  }
+  unlink(ROOT.'/data/user/'.$userFile);
+  rmdir(ROOT.'/public/static/user/admin1234');
+});
+
+// TODO: CLIからクッキーを設定出来ないから、「Site\Lib\Auth::getUserData(): Return value must be of type stdClass, null returned」って発生する・・・
+// $test->describe('ログインとログアウト', function($test): void {
+//   $user = "admin1234";
+//   $pass = "testTEST1234!#$%@[]:;";
+//   $passVerify = "testTEST1234!#$%@[]:;";
+//   $email = "test@076.co.jp";
+
+//   $auth = new Auth();
+//   $res = $auth->mkUser($user, $pass, $passVerify, $email);
+//   unset($auth);
+
+//   $test->it('正しい認証情報でログイン出来るはず', function($test) use ($user, $pass): void {
+//     $auth = new Auth();
+//     $res = $auth->setToken($user, $pass);
+
+//     $test->assertTrue($res->isSuccess);
+//     $test->assertEquals('ログイン成功', $res->message);
+
+//     $auth2 = new Auth();
+//     $usr = $auth2->getLoggedInUser();
+
+//     $test->assertNotNull($usr);
+//     $test->assertEquals($user, $usr->username);
+//   });
+
+//   $test->it('間違ったパスワードでログイン出来ないはず', function($test) use ($user): void {
+//     $auth = new Auth();
+//     $res = $auth->setToken($user, 'fuseipassword');
+
+//     $test->assertFalse($res->isSuccess);
+//     $test->assertEquals('ユーザー名又はパスワードが一致していません', $res->message);
+//   });
+
+//   $test->it('存在しないユーザーでログイン出来ないはず', function($test) use ($pass): void {
+//     $auth = new Auth();
+//     $res = $auth->setToken('fumeiuser', $pass);
+
+//     $test->assertFalse($res->isSuccess);
+//     $test->assertEquals('ユーザー名又はパスワードが一致していません', $res->message);
+//   });
+
+//   $test->it('ログアウト出来るはず', function($test) use ($user, $pass): void {
+//     $auth = new Auth();
+//     $auth->setToken($user, $pass);
+
+//     $res = $auth->logout();
+
+//     $test->assertTrue($res->isSuccess);
+//     $test->assertEquals('ログイン成功', $res->message);
+
+//     $auth2 = new Auth();
+//     $usr = $auth2->getLoggedInUser();
+
+//     $test->assertNull($usr);
+//   });
+
+//   // ユーザーの削除
+//   $users = scandir(ROOT.'/data/user');
+//   $userFile = '';
+//   foreach ($users as $u) {
+//     if (str_contains($u, 'admin1234')) {
+//       $userFile = $u;
+//       break;
+//     }
+//   }
+//   unlink(ROOT.'/data/user/'.$userFile);
+//   rmdir(ROOT.'/public/static/user/admin1234');
+// });
\ No newline at end of file
diff --git a/tester.php b/tester.php
index b2e81ee..87dc5ea 100644
--- a/tester.php
+++ b/tester.php
@@ -1,8 +1,12 @@
 <?php
 require_once __DIR__.DIRECTORY_SEPARATOR.'/autoload.php';
+require_once __DIR__.DIRECTORY_SEPARATOR.'/util.php';
 define('ROOT', realpath(__DIR__));
 require_once __DIR__.DIRECTORY_SEPARATOR.'/config/config.php';
 
+mb_internal_encoding('UTF-8');
+header('Content-Type: text/plain; charset=UTF-8');
+
 $testDir = __DIR__.DIRECTORY_SEPARATOR.'src/Site/Test';
 $testFiles = glob($testDir.'/*.php');