I decided to look at the source code after finding out that my enum assertions weren't identifying the subject name when using Be(), and yet it is identified correctly when using NotBe().

Apparently, in EnumAssertions.Be() (see line 60), {context:the enum} was not being used:

This doesn't match the counterpart NotBe() (see line 105):

The above are permalinks but the issue currently exists in both the develop and master branches.