public function testExecuteException()
{
$html = '<script>window.location.href = ' . self::REVIEW_URL . ';</script>';
$shippingMethod = 'flat_rate';
$this->requestMock->expects($this->at(0))->method('getParam')->with('isAjax')->willReturn(true);
$this->requestMock->expects($this->at(1))->method('getParam')->with('shipping_method')->willReturn($shippingMethod);
$this->setupCart();
$exceptionMsg = new \Magento\Framework\Phrase('error');
$exception = new \Magento\Framework\Exception\LocalizedException($exceptionMsg);
$this->checkoutMock->expects($this->once())->method('updateShippingMethod')->with($shippingMethod)->willThrowException($exception);
$this->messageManager->expects($this->once())->method('addExceptionMessage')->with($exception, $exceptionMsg);
$this->responseMock->expects($this->once())->method('setBody')->with($html);
$this->controller->executeInternal();
}
