sethvargo/chefspec — pull request #282 by ryotarai (2013-12-17 12:58:25+00:00)
Title: Raise an error when cookbook_path can't be determined.

With this patch:
```
1) example::default installs foo
Failure/Error: let(:chef_run) { ChefSpec::Runner.new.converge(described_recipe) }
ChefSpec::Error:
Can't find cookbook_path. (You should put spec files under 'spec' directory or set RSpec.configuration.cookbook_path)
# /Users/ryota/code/github/sethvargo/chefspec/lib/chefspec/runner.rb:303:in `calling_cookbook_path'
# /Users/ryota/code/github/sethvargo/chefspec/lib/chefspec/runner.rb:67:in `initialize'
# ./foo_spec.rb:4:in `new'
# ./foo_spec.rb:4:in `block (2 levels) in '
# ./foo_spec.rb:7:in `block (2 levels) in '
```