code: protected synchronized boolean unsetExpectation(final AbstractExpectation<C, P> expectation) {
          if (this.expectations.containsKey(expectation)) {
              this.expectations.remove(expectation);
              AbstractExpectationManager.LOGGER.info("Unregistered expectation {}.", expectation);
              return true;
          }
          return false;
      }
docs: Stop tracking this expectation. Calls from the internal code only.
  
  @param expectation
  The expectation to stop.
  @return If stopped, false if stopped already.