Testing no memory leak occurs via references

[Albert Yang]

Upon a cursory inspection of ForceGC.java, it seems that the fundamental logic involves waiting for a certain duration and relying on chance. However, I am of the opinion that utilizing the WhiteBox API can provide greater determinism and potentially strengthen some of the assertions.

> I decided ForceGC is simpler and easier to use

I was not aware of your specific requirements, so I cannot say for certain which approach is best. (However, it is worth noting that the WhiteBox API can be utilized to implement ForceGC if necessary.)

/Albert