diff --git a/codeception.yml b/codeception.yml
deleted file mode 100644
index 35fa7fde..00000000
--- a/codeception.yml
+++ /dev/null
@@ -1,10 +0,0 @@
-actor: Tester
-paths:
-    tests: tests
-    log: tests/_output
-    data: tests/_data
-    helpers: tests/_support
-settings:
-    bootstrap: _bootstrap.php
-    colors: true
-    memory_limit: 1024M
\ No newline at end of file
diff --git a/src/Entities/AuthorizationCodeRequestEntity.php b/src/Entities/AuthorizationCodeRequestEntity.php
deleted file mode 100644
index bd401b24..00000000
--- a/src/Entities/AuthorizationCodeRequestEntity.php
+++ /dev/null
@@ -1,79 +0,0 @@
-<?php
-
-namespace League\OAuth2\Server\Entities;
-
-class AuthorizationCodeRequestEntity
-{
-    /**
-     * @var string
-     */
-    private $clientId;
-
-    /**
-     * @var null|string
-     */
-    private $redirectUri;
-
-    /**
-     * @var null|string
-     */
-    private $scope;
-
-    /**
-     * @var null|string
-     */
-    private $state;
-
-    /**
-     * @return string
-     */
-    public function getClientId()
-    {
-        return $this->clientId;
-    }
-
-    /**
-     * @return null|string
-     */
-    public function getRedirectUri()
-    {
-        return $this->redirectUri;
-    }
-
-    /**
-     * @return null|string
-     */
-    public function getScope()
-    {
-        return $this->scope;
-    }
-
-    /**
-     * @return null|string
-     */
-    public function getState()
-    {
-        return $this->state;
-    }
-
-    /**
-     * AuthorizationCodeRequestEntity constructor.
-     *
-     * @param string      $clientId
-     * @param string|null $redirectUri
-     * @param string|null $scope
-     * @param string|null $state
-     */
-    public function __construct($clientId, $redirectUri = null, $scope = null, $state = null)
-    {
-        $this->clientId = $clientId;
-        $this->redirectUri = $redirectUri;
-        $this->scope = $scope;
-        $this->state = $state;
-    }
-
-    public function __sleep()
-    {
-        return ['clientId', 'redirectUri', 'scope', 'state'];
-    }
-}
diff --git a/tests/_output/.gitignore b/tests/_output/.gitignore
deleted file mode 100644
index e69de29b..00000000
diff --git a/tests/_support/ApiHelper.php b/tests/_support/ApiHelper.php
deleted file mode 100644
index 5fcdbe2c..00000000
--- a/tests/_support/ApiHelper.php
+++ /dev/null
@@ -1,10 +0,0 @@
-<?php
-namespace Codeception\Module;
-
-// here you can define custom actions
-// all public methods declared in helper class will be available in $I
-
-class ApiHelper extends \Codeception\Module
-{
-
-}
diff --git a/tests/api/ClientCredentialsCept.php b/tests/api/ClientCredentialsCept.php
deleted file mode 100644
index f0eff536..00000000
--- a/tests/api/ClientCredentialsCept.php
+++ /dev/null
@@ -1,17 +0,0 @@
-<?php
-$I = new ApiTester($scenario);
-$I->wantTo('get an access token using the client credentials grant');
-$I->sendPOST(
-    'client_credentials.php/access_token',
-    [
-        'grant_type'    => 'client_credentials',
-        'client_id'     => 'myawesomeapp',
-        'client_secret' => 'abc123',
-        'scope'         => 'basic'
-    ]
-);
-$I->canSeeResponseCodeIs(200);
-$I->canSeeResponseIsJson();
-$I->seeResponseJsonMatchesJsonPath('$.token_type');
-$I->seeResponseJsonMatchesJsonPath('$.expires_in');
-$I->seeResponseJsonMatchesJsonPath('$.access_token');
\ No newline at end of file
diff --git a/tests/api/ClientCredentialsInvalidClientIdCept.php b/tests/api/ClientCredentialsInvalidClientIdCept.php
deleted file mode 100644
index 97f9fce4..00000000
--- a/tests/api/ClientCredentialsInvalidClientIdCept.php
+++ /dev/null
@@ -1,17 +0,0 @@
-<?php
-$I = new ApiTester($scenario);
-$I->wantTo('get an access token using the client credentials grant, invalid client id');
-$I->sendPOST(
-    'client_credentials.php/access_token',
-    [
-        'grant_type'    => 'client_credentials',
-        'client_id'     => 'myawesomeapp-wrong',
-        'client_secret' => 'foobar'
-    ]
-);
-$I->canSeeResponseCodeIs(401);
-$I->canSeeResponseIsJson();
-$I->seeResponseContainsJson([
-    'error'   => 'invalid_client',
-    'message' => 'Client authentication failed.'
-]);
diff --git a/tests/api/ClientCredentialsInvalidClientSecretCept.php b/tests/api/ClientCredentialsInvalidClientSecretCept.php
deleted file mode 100644
index fe4f88fc..00000000
--- a/tests/api/ClientCredentialsInvalidClientSecretCept.php
+++ /dev/null
@@ -1,17 +0,0 @@
-<?php
-$I = new ApiTester($scenario);
-$I->wantTo('get an access token using the client credentials grant, invalid client secret');
-$I->sendPOST(
-    'client_credentials.php/access_token',
-    [
-        'grant_type'    => 'client_credentials',
-        'client_id'     => 'myawesomeapp',
-        'client_secret' => 'foobar'
-    ]
-);
-$I->canSeeResponseCodeIs(401);
-$I->canSeeResponseIsJson();
-$I->seeResponseContainsJson([
-    'error'   => 'invalid_client',
-    'message' => 'Client authentication failed.'
-]);
diff --git a/tests/api/ClientCredentialsMissingClientIdCept.php b/tests/api/ClientCredentialsMissingClientIdCept.php
deleted file mode 100644
index 68135cdb..00000000
--- a/tests/api/ClientCredentialsMissingClientIdCept.php
+++ /dev/null
@@ -1,15 +0,0 @@
-<?php
-$I = new ApiTester($scenario);
-$I->wantTo('get an access token using the client credentials grant, missing client id');
-$I->sendPOST(
-    'client_credentials.php/access_token',
-    [
-        'grant_type' => 'client_credentials'
-    ]
-);
-$I->canSeeResponseCodeIs(400);
-$I->canSeeResponseIsJson();
-$I->seeResponseContainsJson([
-    'error'   => 'invalid_request',
-    'message' => 'The request is missing a required parameter, includes an invalid parameter value, includes a parameter more than once, or is otherwise malformed. Check the "client_id" parameter.'
-]);
diff --git a/tests/api/ClientCredentialsMissingClientSecretCept.php b/tests/api/ClientCredentialsMissingClientSecretCept.php
deleted file mode 100644
index 369e22d6..00000000
--- a/tests/api/ClientCredentialsMissingClientSecretCept.php
+++ /dev/null
@@ -1,16 +0,0 @@
-<?php
-$I = new ApiTester($scenario);
-$I->wantTo('get an access token using the client credentials grant, missing client secret');
-$I->sendPOST(
-    'client_credentials.php/access_token',
-    [
-        'grant_type' => 'client_credentials',
-        'client_id'  => 'myawesomeapp'
-    ]
-);
-$I->canSeeResponseCodeIs(400);
-$I->canSeeResponseIsJson();
-$I->seeResponseContainsJson([
-    'error'   => 'invalid_request',
-    'message' => 'The request is missing a required parameter, includes an invalid parameter value, includes a parameter more than once, or is otherwise malformed. Check the "client_secret" parameter.'
-]);
diff --git a/tests/api/_bootstrap.php b/tests/api/_bootstrap.php
deleted file mode 100644
index 8a885558..00000000
--- a/tests/api/_bootstrap.php
+++ /dev/null
@@ -1,2 +0,0 @@
-<?php
-// Here you can initialize variables that will be available to your tests