A will is an important document and the testator may have made his or her spouse a beneficiary in the will.

However what happens when the testator remarries?  What does the law say?

Any gift to or appointment in favour of one spouse in the will of the other shall be invalidated if the marriage has been terminated by divorce or annulment unless the will contains an express provision to the contrary.
This means the former spouse would not be entitled to the gift in the will, unless the testator makes express provision for it. Just because the gift becomes invalid, it does not mean the will is invalid.