public function testExecuteException()
{
$agreement = ['test-data'];
$quote = $this->getQuoteMock();
$quote->expects(self::once())->method('getItemsCount')->willReturn(0);
$resultMock = $this->getResultMock();
$resultMock->expects(self::once())->method('setPath')->with('checkout/cart')->willReturnSelf();
$this->resultFactoryMock->expects(self::once())->method('create')->with(ResultFactory::TYPE_REDIRECT)->willReturn($resultMock);
$this->requestMock->expects(self::once())->method('getPostValue')->with('agreement', [])->willReturn($agreement);
$this->checkoutSessionMock->expects(self::once())->method('getQuote')->willReturn($quote);
$this->orderPlaceMock->expects(self::never())->method('execute');
$this->messageManagerMock->expects(self::once())->method('addExceptionMessage')->with(self::isInstanceOf('\\InvalidArgumentException'), 'We can\'t initialize checkout.');
self::assertEquals($this->placeOrder->execute(), $resultMock);
}
