How to set a gem binary in path? - ruby

Question

I have a gem I have built with an executable. The executable is under the bin directory of my repo and it is defined in the gemspec file:
spec.executables << 'my_gem'
After installing the gem the executable is also installed correctly:
$ ls /Users/myuser/.gems/gems/my_gem-1.0.0/
bin/ lib/
$ ls /Users/myuser/.gems/gems/my_gem-1.0.0/bin/
my_gem*
However I want to add this executable in the path so I can run something along the lines of my_gem or bundle exec my_gem to run the executable from the cli.
What do I need to add to my gemspec file to do this?
Here is my ruby version and ruby gems versions:
$ ruby -v
ruby 2.1.1p76
$ gem -v
2.2.2
Here is my gem env:
$ gem env
RubyGems Environment:
- RUBYGEMS VERSION: 2.2.2
- RUBY VERSION: 2.1.1 (2014-02-24 patchlevel 76) [x86_64-darwin15.0]
- INSTALLATION DIRECTORY: /Users/myuser/.gems
- RUBY EXECUTABLE: /Users/myuser/.rbenv/versions/2.1.1/bin/ruby
- EXECUTABLE DIRECTORY: /Users/myuser/.gems/bin
- SPEC CACHE DIRECTORY: /Users/myuser/.gem/specs
- RUBYGEMS PLATFORMS:
- ruby
- x86_64-darwin-15
- GEM PATHS:
- /Users/myuser/.gems
- /Users/myuser/.gem/ruby/2.1.0
- /Users/myuser/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :backtrace => false
- :bulk_threshold => 1000
- :sources => ["https://rubygems.org/", "https://my.org.url/artifactory/api/gems/gem-public/"]
- REMOTE SOURCES:
- https://rubygems.org/
- https://my.org.url/artifactory/api/gems/gem-public/
- SHELL PATH:
- /Users/myuser/.rbenv/versions/2.1.1/bin
- /usr/local/Cellar/rbenv/1.0.0/libexec
- /Users/myuser/.rbenv/shims
- /Users/myuser/.rbenv/bin
- /usr/local/bin
- /usr/bin
- /bin
- /usr/sbin
- /sbin
The weird thing is that I already attempted this with a different gem I created using the gem tutorial and that works just fine.
Update: When debugging this for some reason it's running the lib/my_gem.rb file instead of the bin/my_gem file.

Answer 1

The gem has been installed properly. The issue is actually with the executable.
The executable I created ended with this common if statement:
if $PROGRAM_NAME == __FILE__
main
end
To fix it I just had to change it to this:
main