Issue Resolution
The unit test executes the following independent tests within ping_main()

1.     test_taskSwitchWithSemaphore();
2.     test_taskSwitchWithTaskNotify();
3.     test_taskYield();
4.     test_taskToIsrUsingSemaphoreAndNoTaskSwitch();
5.     test_taskToIsrUsingTaskNotifyAndNoTaskSwitch();
6.     test_taskToIsrUsingSemaphoreAndWithTaskSwitch();
7.     test_taskToIsrUsingTaskNotifyAndWithTaskSwitch();
8.     test_taskSwitchWithFloatOperations();
9.     test_taskToIsrWithFloatOperations();
10.     test_taskDelay();

each of which performs it's own execution time check which it reports.

With different combinations of the test included, the execution time seems to vary. 
Please see the results below:

Workaround
NA