There are some C++ unit tests that need to check that a set of values eventually converge to another set of values. One example is the ticketholder test that needs to wait until a certain condition is met. In other suites they've had to implement their own version of assertSoon in their fixtures.

Considering that there is a method in the JS tests called assert.soon() that checks the given criteria repeatedly until it passes, would it be possible to add something similar to C++ unit tests?