Get rid of code repetition in concurrentfilter test.
Move tests with initial value next to their original version.
Join new lambda tests into a common functions
testing all possible 16 combinations of
functor / function / member / lambda, as they
test in fact the same function. There is no need
to distinguish lambda case over other cases.
This helps in test readability and maintenance.
Add missing tests for lambdas with a combination
of initial value.
Task-number: QTBUG-83802
Change-Id: I45930c1e18a9e4e561909f46a5cbbdf0ad7ba333
Reviewed-by: Sona Kurazyan <sona.kurazyan@qt.io>
daea738b9f