diff --git a/tests/Stubs/StubResponseType.php b/tests/Stubs/StubResponseType.php
new file mode 100644
index 00000000..4d40b089
--- /dev/null
+++ b/tests/Stubs/StubResponseType.php
@@ -0,0 +1,60 @@
+<?php
+
+namespace LeagueTests\Stubs;
+
+use League\OAuth2\Server\Entities\Interfaces\AccessTokenEntityInterface;
+use League\OAuth2\Server\Entities\Interfaces\RefreshTokenEntityInterface;
+use League\OAuth2\Server\ResponseTypes\AbstractResponseType;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+
+class StubResponseType extends AbstractResponseType
+{
+    public function __construct() {}
+
+    public function getAccessToken()
+    {
+        return $this->accessToken;
+    }
+
+    public function getRefreshToken()
+    {
+        return $this->refreshToken;
+    }
+
+    /**
+     * @param \League\OAuth2\Server\Entities\Interfaces\AccessTokenEntityInterface $accessToken
+     */
+    public function setAccessToken(AccessTokenEntityInterface $accessToken)
+    {
+        $this->accessToken = $accessToken;
+    }
+
+    /**
+     * @param \League\OAuth2\Server\Entities\Interfaces\RefreshTokenEntityInterface $refreshToken
+     */
+    public function setRefreshToken(RefreshTokenEntityInterface $refreshToken)
+    {
+        $this->refreshToken = $refreshToken;
+    }
+
+    /**
+     * @param ServerRequestInterface $request
+     *
+     * @return ServerRequestInterface
+     */
+    public function determineAccessTokenInHeader(ServerRequestInterface $request)
+    {
+        // TODO: Implement determineAccessTokenInHeader() method.
+    }
+
+    /**
+     * @param ResponseInterface $response
+     *
+     * @return ResponseInterface
+     */
+    public function generateHttpResponse(ResponseInterface $response)
+    {
+        // TODO: Implement generateHttpResponse() method.
+    }
+}
\ No newline at end of file
diff --git a/tests/Stubs/UserEntity.php b/tests/Stubs/UserEntity.php
new file mode 100644
index 00000000..4c157df5
--- /dev/null
+++ b/tests/Stubs/UserEntity.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace LeagueTests\Stubs;
+
+use League\OAuth2\Server\Entities\Interfaces\UserEntityInterface;
+
+class UserEntity implements UserEntityInterface
+{
+    public function getIdentifier()
+    {
+        return 123;
+    }
+}
\ No newline at end of file