Increase code coverage

[HliasMpGH]

Increased the code coverage by testing untested components.

The componets that were tested (that previously were not) include:

MethodSpec:

• addTypeVariables() (Tested with list of TypeVariables - not done before)
• addExceptions() (Tested with list of Exceptions - not done before)
• addComment()
• addNamedCode()

TypeSpec:

• addPermits() (Tested with list of Classes - not done before)
• recordBuilder() (Tested with ClassName (and not string) - not done before)

LineWrapper:

• append() (Tested overload that appends substring)