diff --git a/tests/TestCase.php b/tests/TestCase.php
index 0ff1962..185b27a 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -12,6 +12,8 @@ protected function setUp(): void
     {
         parent::setUp();
 
+        copy(__DIR__.'/../vendor/orchestra/testbench-core/laravel/.env.example', __DIR__.'/../vendor/orchestra/testbench-core/laravel/.env');
+
         // テスト用のファイルが残ってたら消す(web.php)
         if (is_file(__DIR__.'/../vendor/orchestra/testbench-core/laravel/routes/web.php')) {
             unlink(__DIR__.'/../vendor/orchestra/testbench-core/laravel/routes/web.php');
@@ -56,6 +58,17 @@ protected function setUp(): void
         file_put_contents(__DIR__.'/../vendor/orchestra/testbench-core/laravel/config/app.php', $configfile);
     }
 
+    protected function tearDown(): void
+    {
+        parent::tearDown();
+
+        // テスト用のファイルが残ってたら消す(.env)
+        if (is_file(__DIR__.'/../vendor/orchestra/testbench-core/laravel/.env')) {
+            unlink(__DIR__.'/../vendor/orchestra/testbench-core/laravel/.env');
+        }
+
+    }
+
     protected function getPackageProviders($app)
     {
         return [