This semaphore test set covers the following scenarios.

nano_fiber_sem_take(TICKS_UNLIMITED)
  - Wait for a semaphore to be given
  - Take a semaphore without waiting

nano_task_sem_take(TICKS_UNLIMITED)
  - Wait for a semaphore to be given
  - Take a semaphore without waiting

nano_isr_sem_take
  - Take a semaphore without waiting
  - Try to take an unavailable semaphore

nano_fiber_sem_take
  - Take a semaphore without waiting
  - Try to take an unavailable semaphore

nano_task_sem_take
  - Take a semaphore without waiting
  - Try to take an unavailable semaphore

nano_fiber_sem_give
  - Waking a task blocked on a semaphore
  - Giving an available semaphore

nano_task_sem_give
  - Waking a fiber blocked on a semaphore
  - Giving an available semaphore

nano_isr_sem_give
  - Waking a task blocked on a semaphore
  - Giving an available semaphore