instead of keeping them as flat variables, prefix all internals with `__` to create consistency. Also add accessors on the class-level to expose these values in all rules. This way we keep all variable-names in one location and get some safety on access.
In some instances, when running inspec shell, you dont get any resources inside of it. i.e. `inspec shell` and then `os` will lead to
```ruby
NameError: undefined local variable or method `os' for
from (pry):1:in `add_content'
```
This is because of instance_eval loading withing the given source/line
information and not attaching to the profile context which actually has
all the resources. Fix it by making sure that inspec shell always
attaches to the profile context with resources by providing nil for
source and line information.
```
describe.one do
describe command("uname -r").stdout do
it { should_not match /x86_64/ }
end
describe test_sth_for_x64_processors do
...
end
end
```
