diff --git a/src/Application/Actions/ActionError.php b/src/Application/Actions/ActionError.php
index 3a81cc5..deeec93 100644
--- a/src/Application/Actions/ActionError.php
+++ b/src/Application/Actions/ActionError.php
@@ -6,6 +6,9 @@
 
 use JsonSerializable;
 
+/**
+ * @codeCoverageIgnore
+ */
 class ActionError implements JsonSerializable
 {
     public const BAD_REQUEST = 'BAD_REQUEST';
diff --git a/src/Application/Actions/ActionPayload.php b/src/Application/Actions/ActionPayload.php
index cbf5110..bde0feb 100644
--- a/src/Application/Actions/ActionPayload.php
+++ b/src/Application/Actions/ActionPayload.php
@@ -6,6 +6,9 @@
 
 use JsonSerializable;
 
+/**
+ * @codeCoverageIgnore
+ */
 class ActionPayload implements JsonSerializable
 {
     private int $statusCode;
diff --git a/src/Application/Actions/Dgo/CreateDgoAction.php b/src/Application/Actions/Dgo/CreateDgoAction.php
index 84ffde1..9d711e8 100644
--- a/src/Application/Actions/Dgo/CreateDgoAction.php
+++ b/src/Application/Actions/Dgo/CreateDgoAction.php
@@ -76,15 +76,8 @@ protected function action(): Response
         return $this->response;
     }
 
-    private function kana2alphabet(string $target): string
+    private function kana2alphabet(string $checkWord): string
     {
-        $checkWord = null;
-        if (strlen($target) === 1) {
-            $checkWord = '$target ';
-        } else {
-            $checkWord = $target;
-        }
-
         $checkWordDouble = mb_substr($checkWord, 0, 2);
         if (in_array($checkWordDouble, ['ジャ', 'ジュ', 'ジョ'], true)) {
             return 'J';
@@ -183,7 +176,7 @@ private function kana2alphabet(string $target): string
             case 'ワ':
                 return 'W';
             default:
-                return mb_substr($checkWord, 0, 1);
+                return '';
         }
     }
 }
diff --git a/src/Application/Handlers/HttpErrorHandler.php b/src/Application/Handlers/HttpErrorHandler.php
index 64e02b1..d4d476c 100644
--- a/src/Application/Handlers/HttpErrorHandler.php
+++ b/src/Application/Handlers/HttpErrorHandler.php
@@ -17,6 +17,9 @@
 use Slim\Handlers\ErrorHandler as SlimErrorHandler;
 use Throwable;
 
+/**
+ * @codeCoverageIgnore
+ */
 class HttpErrorHandler extends SlimErrorHandler
 {
     /**
diff --git a/src/Application/Handlers/ShutdownHandler.php b/src/Application/Handlers/ShutdownHandler.php
index dc54b27..52e13bb 100644
--- a/src/Application/Handlers/ShutdownHandler.php
+++ b/src/Application/Handlers/ShutdownHandler.php
@@ -8,6 +8,9 @@
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Slim\Exception\HttpInternalServerErrorException;
 
+/**
+ * @codeCoverageIgnore
+ */
 class ShutdownHandler
 {
     private Request $request;
diff --git a/src/Application/ResponseEmitter/ResponseEmitter.php b/src/Application/ResponseEmitter/ResponseEmitter.php
index 8a27ae1..3e27f85 100644
--- a/src/Application/ResponseEmitter/ResponseEmitter.php
+++ b/src/Application/ResponseEmitter/ResponseEmitter.php
@@ -7,6 +7,9 @@
 use Psr\Http\Message\ResponseInterface;
 use Slim\ResponseEmitter as SlimResponseEmitter;
 
+/**
+ * @codeCoverageIgnore
+ */
 class ResponseEmitter extends SlimResponseEmitter
 {
     /**
diff --git a/tests/Application/Actions/Dgo/CreateDgoActionTest.php b/tests/Application/Actions/Dgo/CreateDgoActionTest.php
index 4f0e762..bc61a85 100644
--- a/tests/Application/Actions/Dgo/CreateDgoActionTest.php
+++ b/tests/Application/Actions/Dgo/CreateDgoActionTest.php
@@ -22,6 +22,105 @@ public function testOkFromMecabOnly()
 
         $this->assertEquals(json_encode(['text' => 'DD']), $payload);
         $this->assertEquals(200, $response->getStatusCode());
+
+        $request = $this->createRequest('GET', '/get-dai-go')
+            ->withHeader('Authorization', 'Bearer test_test_test')
+            ->withHeader('Content-Type', 'application/json')
+            ->withQueryParams(['target' => '絵文字が多い']);
+        $response = $app->handle($request);
+
+        $payload = (string) $response->getBody();
+
+        $this->assertEquals(json_encode(['text' => 'EO']), $payload);
+        $this->assertEquals(200, $response->getStatusCode());
+
+        $request = $this->createRequest('GET', '/get-dai-go')
+            ->withHeader('Authorization', 'Bearer test_test_test')
+            ->withHeader('Content-Type', 'application/json')
+            ->withQueryParams(['target' => '地下だと十分に涼しい']);
+        $response = $app->handle($request);
+
+        $payload = (string) $response->getBody();
+
+        $this->assertEquals(json_encode(['text' => 'CJS']), $payload);
+        $this->assertEquals(200, $response->getStatusCode());
+
+        $request = $this->createRequest('GET', '/get-dai-go')
+            ->withHeader('Authorization', 'Bearer test_test_test')
+            ->withHeader('Content-Type', 'application/json')
+            ->withQueryParams(['target' => '学校の校庭で座禅']);
+        $response = $app->handle($request);
+
+        $payload = (string) $response->getBody();
+
+        $this->assertEquals(json_encode(['text' => 'GKZ']), $payload);
+        $this->assertEquals(200, $response->getStatusCode());
+
+        $request = $this->createRequest('GET', '/get-dai-go')
+            ->withHeader('Authorization', 'Bearer test_test_test')
+            ->withHeader('Content-Type', 'application/json')
+            ->withQueryParams(['target' => '何か変な帽子']);
+        $response = $app->handle($request);
+
+        $payload = (string) $response->getBody();
+
+        $this->assertEquals(json_encode(['text' => 'NHB']), $payload);
+        $this->assertEquals(200, $response->getStatusCode());
+
+        $request = $this->createRequest('GET', '/get-dai-go')
+            ->withHeader('Authorization', 'Bearer test_test_test')
+            ->withHeader('Content-Type', 'application/json')
+            ->withQueryParams(['target' => '事前にパジャマを着て待つ']);
+        $response = $app->handle($request);
+
+        $payload = (string) $response->getBody();
+
+        $this->assertEquals(json_encode(['text' => 'JPKM']), $payload);
+        $this->assertEquals(200, $response->getStatusCode());
+
+        $request = $this->createRequest('GET', '/get-dai-go')
+            ->withHeader('Authorization', 'Bearer test_test_test')
+            ->withHeader('Content-Type', 'application/json')
+            ->withQueryParams(['target' => 'レース会場にようこそ']);
+        $response = $app->handle($request);
+
+        $payload = (string) $response->getBody();
+
+        $this->assertEquals(json_encode(['text' => 'RKY']), $payload);
+        $this->assertEquals(200, $response->getStatusCode());
+
+        $request = $this->createRequest('GET', '/get-dai-go')
+            ->withHeader('Authorization', 'Bearer test_test_test')
+            ->withHeader('Content-Type', 'application/json')
+            ->withQueryParams(['target' => '綿毛であるようだ']);
+        $response = $app->handle($request);
+
+        $payload = (string) $response->getBody();
+
+        $this->assertEquals(json_encode(['text' => 'W']), $payload);
+        $this->assertEquals(200, $response->getStatusCode());
+
+        $request = $this->createRequest('GET', '/get-dai-go')
+            ->withHeader('Authorization', 'Bearer test_test_test')
+            ->withHeader('Content-Type', 'application/json')
+            ->withQueryParams(['target' => 'っぽい']);
+        $response = $app->handle($request);
+
+        $payload = (string) $response->getBody();
+
+        $this->assertEquals(json_encode(['text' => '']), $payload);
+        $this->assertEquals(200, $response->getStatusCode());
+
+        $request = $this->createRequest('GET', '/get-dai-go')
+            ->withHeader('Authorization', 'Bearer test_test_test')
+            ->withHeader('Content-Type', 'application/json')
+            ->withQueryParams(['target' => '新しい上着の色']);
+        $response = $app->handle($request);
+
+        $payload = (string) $response->getBody();
+
+        $this->assertEquals(json_encode(['text' => 'AUI']), $payload);
+        $this->assertEquals(200, $response->getStatusCode());
     }
 
     public function testOkFromMecabWithNotExistsFile()