Displays tests added in the new PR branch

custom_json_formatter.rb

# frozen_string_literal: true

require "rspec/core/formatters/base_text_formatter"

class CustomJsonFormatter
  # This registers the notifications this formatter supports, and tells
  # us that this was written against the RSpec 3.x formatter API.
  RSpec::Core::Formatters.register self, :example_started

  def initialize(output)
    @output = output
  end

  def example_started(notification)
    @output << {
      full_description: notification.example.full_description,
      location: notification.example.location
    }.to_json
    @output << ",\n"
  end
end

pr_rspec_diff

#!/usr/bin/env ruby
# frozen_string_literal: true

require "json"

results = `git diff --name-status master | grep _spec.rb`

files_by_git_action = { A: [], M: [], D: [] }

results.split("\n").each do |result_line|
  git_action, file = result_line.split("\t")
  files_by_git_action[git_action.to_sym] << file
end

`git checkout master`
puts "Running specs for files changed or deleted"
master_output = `bundle exec rspec #{(files_by_git_action[:M] + files_by_git_action[:D]).join(" ")} --require ./spec/support/custom_json_formatter.rb --format CustomJsonFormatter`

`git checkout -`
puts "Running specs for files changed or created"
branch_output = `bundle exec rspec #{(files_by_git_action[:M] + files_by_git_action[:A]).join(" ")} --require ./spec/support/custom_json_formatter.rb --format CustomJsonFormatter`

master_rows = JSON.parse("[#{master_output[0..-3]}]")
master_full_descriptions = master_rows.map{ |row| row["full_description"] }
branch_rows = JSON.parse("[#{branch_output[0..-3]}]")
branch_full_descriptions = branch_rows.map{ |row| row["full_description"] }

new_examples = branch_full_descriptions.uniq - (master_full_descriptions.uniq & branch_full_descriptions.uniq)

locations = branch_rows.select{ |row| new_examples.include?(row["full_description"]) }.map{ |row| row["location"] }

pr_changed_tests = "bundle exec rspec #{locations.sort.join(" ")} --format documentation"
puts pr_changed_tests
puts "Running specs...\n"
puts `#{pr_changed_tests}`