diff --git a/plugins/bc-installer/src/Controller/Admin/InstallationsController.php b/plugins/bc-installer/src/Controller/Admin/InstallationsController.php
index 59c5c9402f..6d8ee4de1a 100644
--- a/plugins/bc-installer/src/Controller/Admin/InstallationsController.php
+++ b/plugins/bc-installer/src/Controller/Admin/InstallationsController.php
@@ -98,6 +98,7 @@ public function step2(InstallationsAdminServiceInterface $service)
      * @return void|Response
      * @noTodo
      * @checked
+     * @unitTest
      */
     public function step3(InstallationsAdminServiceInterface $service)
     {
diff --git a/plugins/bc-installer/tests/TestCase/Controller/Admin/InstallationsControllerTest.php b/plugins/bc-installer/tests/TestCase/Controller/Admin/InstallationsControllerTest.php
index 15c6f3af42..3c36ff1598 100644
--- a/plugins/bc-installer/tests/TestCase/Controller/Admin/InstallationsControllerTest.php
+++ b/plugins/bc-installer/tests/TestCase/Controller/Admin/InstallationsControllerTest.php
@@ -10,9 +10,12 @@
  */
 
 namespace BcInstaller\Test\TestCase\Controller\Admin;
+use BaserCore\Test\Scenario\InitAppScenario;
 use BaserCore\TestSuite\BcTestCase;
 use BcInstaller\Controller\Admin\InstallationsController;
+use Cake\Core\Configure;
 use Cake\Event\Event;
+use CakephpFixtureFactories\Scenario\ScenarioAwareTrait;
 
 /**
  * Class InstallationsControllerTest
@@ -21,6 +24,7 @@
  */
 class InstallationsControllerTest extends BcTestCase
 {
+    use ScenarioAwareTrait;
 
     /**
     /**
@@ -29,6 +33,8 @@ class InstallationsControllerTest extends BcTestCase
     public function setUp(): void
     {
         parent::setUp();
+        $this->loadFixtureScenario(InitAppScenario::class);
+        $this->loginAdmin($this->getRequest());
     }
 
     /**
@@ -73,7 +79,41 @@ public function testStep2()
      */
     public function testStep3()
     {
-        $this->markTestIncomplete('このテストは、まだ実装されていません。');
+        $this->enableSecurityToken();
+        $this->enableCsrfToken();
+        Configure::write("BcEnv.isInstalled", false);
+
+        $this->get('/baser/admin/bc-installer/installations/step3');
+        $this->assertResponseCode(200);
+
+        $config = [
+            'mode' => 'back',
+            'dbType' => 'mysql',
+            'dbHost' => 'localhost',
+            'dbPrefix' => '',
+            'dbPort' => '3306',
+            'dbUsername' => 'dbUsername',
+            'dbPassword' => 'dbPassword',
+            'dbSchema' => 'dbSchema',
+            'dbName' => 'basercms',
+            'dbEncoding' => 'utf-8',
+            'dbDataPattern' => 'BcThemeSample.default'
+        ];
+
+        $this->post('/baser/admin/bc-installer/installations/step3', $config);
+        $this->assertResponseCode(302);
+        $this->assertRedirect('/baser/admin/bc-installer/installations/step2');
+
+        $config['mode'] = 'checkDb';
+        $this->post('/baser/admin/bc-installer/installations/step3', $config);
+        $this->assertResponseCode(200);
+
+        $config['mode'] = 'createDb';
+        $this->post('/baser/admin/bc-installer/installations/step3', $config);
+        $this->assertResponseCode(200);
+
+
+        Configure::write("BcEnv.isInstalled", true);
     }
 
     /**