Ruby code coverage config

coverage.rb

# contents of spec/support/coverage.rb

require 'simplecov'
require 'simplecov-rcov'

SimpleCov.formatters = [
  SimpleCov::Formatter::HTMLFormatter,
  SimpleCov::Formatter::RcovFormatter
]

SimpleCov.start 'rails'

# require all files to get more accurate code_coverage data
# https://github.com/colszowka/simplecov/issues/16#issuecomment-31076575

base_result = {}

Dir['**/*.rb'].each do |file|
  absolute = File::expand_path(file)
  lines = File.readlines(absolute, :encoding => 'UTF-8')

  base_result[absolute] = lines.map do |l|
    l.strip!
    l.empty? || l =~ /^else$/ || l =~ /^end$/ || l[0] == '#' ? nil : 0
  end
end

SimpleCov.at_exit do
  original_result = SimpleCov::Result.new(Coverage.result).original_result
  original_result.keys.each do |covered_file|
    base_result.delete(covered_file)
  end

  merged = original_result.merge_resultset(base_result)

  result = SimpleCov::Result.new(merged)
  result.format!
end