Braintree\Configuration::assertHasClientCredentials PHP Method

    public function assertHasClientCredentials()
    {
        $this->assertHasClientId();
        $this->assertHasClientSecret();
    }

 public function testValidWithOAuthClientCredentialsAndAccessToken()
 {
     $config = new Braintree\Configuration(['clientId' => 'client_id$development$integration_client_id', 'clientSecret' => 'client_secret$development$integration_client_secret', 'accessToken' => 'access_token$development$integration_merchant_id$integration_access_token']);
     $config->assertHasClientCredentials();
     $config->assertHasAccessTokenOrKeys();
 }