diff --git a/plugins/bc-mail/src/Model/Entity/MailContent.php b/plugins/bc-mail/src/Model/Entity/MailContent.php
index e40f6c1740..5babb22437 100755
--- a/plugins/bc-mail/src/Model/Entity/MailContent.php
+++ b/plugins/bc-mail/src/Model/Entity/MailContent.php
@@ -60,6 +60,7 @@ class MailContent extends Entity
      * @return int
      * @checked
      * @noTodo
+     * @unitTest
      */
     public function getNumberOfMessages()
     {
diff --git a/plugins/bc-mail/tests/TestCase/Model/Entity/MailContentTest.php b/plugins/bc-mail/tests/TestCase/Model/Entity/MailContentTest.php
new file mode 100644
index 0000000000..e35781ed72
--- /dev/null
+++ b/plugins/bc-mail/tests/TestCase/Model/Entity/MailContentTest.php
@@ -0,0 +1,67 @@
+<?php
+
+namespace BcMail\Test\TestCase\Model\Entity;
+
+use BaserCore\Test\Factory\ContentFactory;
+use BaserCore\TestSuite\BcTestCase;
+use BcMail\Model\Entity\MailContent;
+use BcMail\Service\MailMessagesServiceInterface;
+use BcMail\Test\Factory\MailContentFactory;
+use Cake\ORM\Entity;
+use Cake\ORM\TableRegistry;
+
+class MailContentTest extends BcTestCase
+{
+    public function setUp(): void
+    {
+        parent::setUp();
+        $this->MailContent = new MailContent();
+    }
+
+    public function tearDown(): void
+    {
+        parent::tearDown();
+    }
+
+
+    /**
+     * Test getNumberOfMessages
+     */
+    public function testGetNumberOfMessages()
+    {
+        $MailMessagesService = $this->getService(MailMessagesServiceInterface::class);
+
+        $rs = $this->MailContent->getNumberOfMessages();
+        $this->assertEquals(0, $rs);
+
+        //テストデータベースを生成
+        $MailMessagesService->createTable(1);
+        $mailMessageTable = TableRegistry::getTableLocator()->get('BcMail.MailMessages');
+        $mailContentId = 1;
+        $mailMessageTable->setup($mailContentId);
+        $mailMessageTable->save(new Entity(['id' => 1]));
+        $mailMessageTable->save(new Entity(['id' => 2]));
+        // テストデータを作成する
+        ContentFactory::make([
+            'id' => 9,
+            'name' => 'contact',
+            'plugin' => 'BcMail',
+            'type' => 'MailContent',
+            'entity_id' => 1,
+            'url' => '/contact/',
+            'site_id' => 1,
+            'title' => 'お問い合わせ(※関連Fixture未完了)',
+            'status' => true,
+        ])->persist();
+        MailContentFactory::make(['id' => 1, 'save_info' => 1])->persist();
+
+        $this->MailContent->id = $mailContentId;
+
+        $rs = $this->MailContent->getNumberOfMessages();
+        $this->assertEquals(2, $rs);
+
+        //不要なテーブルを削除
+        $MailMessagesService->dropTable(1);
+    }
+
+}