dev: introduce TestCase.
dev: implement New(Action) and New<TArg>(TArg, Action<TArg>).
dev: implement New<TArg>(Action<TArg>).
dev: implement code template(TestCase.New.tt).
refactor: fix consdering whether test method is static or not,

not declaring type of it.
dev: implement ConvertToTestCommand.
Merge pull request #21 from jwChung/test-case

Implement the TestCase class