Enum test not reflecting in coverage

[Ravi]

Hi

I have a class ABC that uses 2 enum variables

num1 and num2

I have written test class for ABC ,but the coverage report shows
test classes missing for
autogenerated classes ABC$num1 and ABC$num2

although I have written
the test class

class num1Test
{ }

in same path as my class

Can anyone please suggest why it is not showing up in class code coverage

do I need to add any annotations
?