Add missing example parameter in block && fix spec path

[MaicolBen]

Fix:

• Failure/Error: Unable to find matching line from backtrace 'example' is not available from within an example (e.g. an 'it' block) or from constructs that run in the scope of an example (e.g. 'before', 'let', etc). It is only available on an example group (e.g. a 'describe' or 'context' block).. So I added example in the request block
• undefined method underscore' for nil:NilClass in file_name = $1.underscore, so I retrieved the path from example.metadata[:example_group][:file_path]

Resolves #15