Fix Functional Test Magento\Checkout\Test\TestCase\OnePageCheckoutOfflinePaymentMethodsTest::test with data set "OnePageCheckoutTestVariation7_0"

[p-bystritsky]

Preconditions

1. Magento 2

Steps to reproduce

1. Run Functional Test Magento\Checkout\Test\TestCase\OnePageCheckoutOfflinePaymentMethodsTest::test with data set "OnePageCheckoutTestVariation7_0"

Expected result

1. Test should pass successfully.

Actual result

1. Control 'out of stock' is not visible.
   Failed asserting that two strings are equal.
   --- Expected
   +++ Actual
   @@ @@
   -'out of stock'
   +'in stock'

Note

In Magento without MSI products are deducted from Stock immediately after Order is placed, but in Magento with MSI only after Order is shipped / invoiced.

https://travis-ci.org/magento-engcom/msi/jobs/382820875