User can see help message with git pair-commit -h

[finishes #62492694]

Author: Jimmy Da and Matt Royal

lib/pivotal_git_scripts/git_pair.rb

@@ -48,6 +48,15 @@ def main(argv)
  end
 
  def commit(argv)
+ if argv[0] == '-h'
+ puts 'Usage: git pair-commit [options_for_git_commit]'
+ puts ''
+ puts 'Commits changes to the repository using `git commit`, but randomly chooses the author email from the'
+ puts 'member of the pair. In order for GitHub to assign credit for the commit activity, the user\'s email'
+ puts 'must be linked in their GitHub account.'
+ exit 0
+ end
+
  config = read_pairs_config
  _, email_ids = extract_author_names_and_email_ids_from_config(config, current_pair_initials)
  author_email = random_author_email(email_ids, config['email'])

spec/cli_spec.rb

@@ -280,8 +280,8 @@ def git_config_value(name, global = false)
  end
  end
 
- describe "pair-commit" do
- context "when a pair has been set" do
+ describe 'pair-commit' do
+ context 'when a pair has been set' do
  before do
  write ".pairs", <<-YAML.unindent
  pairs:
@@ -309,7 +309,7 @@ def git_config_value(name, global = false)
  end
 
  it "randomly chooses from pair and set user.email" do
- emails = 4.times.map do
+ emails = 6.times.map do
  git_pair_commit
  (run "git log -1 --pretty=%ae").strip
  end
@@ -328,9 +328,16 @@ def git_config_value(name, global = false)
  end
  end
 
- context "when no pair has been set" do
- it "raises an exception" do
- git_pair_commit.should include("Error: No pair set")
+ context 'when no pair has been set' do
+ it 'raises an exception' do
+ git_pair_commit.should include('Error: No pair set')
+ end
+ end
+
+ context 'when -h flag is passed' do
+ it 'shows the help message' do
+ results = run 'git pair-commit -h'
+ results.should include('randomly chooses an email address from the pair to use for the commit')
  end
  end