PayPal\Test\Auth\OAuthTokenCredentialTest::testGetAccessTokenUnitMock PHP Method

    public function testGetAccessTokenUnitMock()
    {
        $config = array('mode' => 'sandbox');
        /** @var OAuthTokenCredential $auth */
        $auth = $this->getMockBuilder('\\PayPal\\Auth\\OAuthTokenCredential')->setConstructorArgs(array('clientId', 'clientSecret'))->setMethods(array('getToken'))->getMock();
        $auth->expects($this->any())->method('getToken')->will($this->returnValue(array('refresh_token' => 'refresh_token_value')));
        $response = $auth->getRefreshToken($config, 'auth_value');
        $this->assertNotNull($response);
        $this->assertEquals('refresh_token_value', $response);
    }