Add simplecov to cucumber env

MSP-11647

Port simplecov setup from metasploit-version so that child processes, in
this case msfconsole, will load simplecov and report coverage back to
the parent process.  Coverage from msfconsole's cucumber features is the
only way to get coverage on portions of the command dispatcher commands.

Author: limhoff-r7

features/support/env.rb

@@ -1,3 +1,6 @@
+# Has to be the first file required so that all other files show coverage information
+require 'simplecov'
+
 # IMPORTANT: This file is generated by cucumber-rails - edit at your own peril.
 # It is recommended to regenerate this file in the future when you upgrade to a 
 # newer version of cucumber-rails. Consider adding your own code to a new file 

features/support/hooks.rb

@@ -2,4 +2,25 @@
   set_env('MSF_DATBASE_CONFIG', Rails.configuration.paths['config/database'].existent.first)
   set_env('RAILS_ENV', 'test')
   @aruba_timeout_seconds = 4.minutes
-end
+end
+
+Before do |scenario|
+  command_name = case scenario
+                 when Cucumber::Ast::Scenario, Cucumber::Ast::ScenarioOutline
+                   "#{scenario.feature.title} #{scenario.name}"
+                 when Cucumber::Ast::OutlineTable::ExampleRow
+                   scenario_outline = scenario.scenario_outline
+
+                   "#{scenario_outline.feature.title} #{scenario_outline.name} #{scenario.name}"
+                 else
+                   raise TypeError, "Don't know how to extract command name from #{scenario.class}"
+                 end
+
+  # Used in simplecov_setup so that each scenario has a different name and their coverage results are merged instead
+  # of overwriting each other as 'Cucumber Features'
+  set_env('SIMPLECOV_COMMAND_NAME', command_name)
+
+  simplecov_setup_pathname = Pathname.new(__FILE__).expand_path.parent.join('simplecov_setup')
+  # set environment variable so child processes will merge their coverage data with parent process's coverage data.
+  set_env('RUBYOPT', "-r#{simplecov_setup_pathname} #{ENV['RUBYOPT']}")
+end

features/support/simplecov_setup.rb

@@ -0,0 +1,11 @@
+# @note this file is loaded in env.rb to setup simplecov using RUBYOPTs for child processes
+
+require 'simplecov'
+
+require 'pathname'
+
+root = Pathname(__FILE__).expand_path.parent.parent.parent
+
+SimpleCov.command_name(ENV['SIMPLECOV_COMMAND_NAME'])
+SimpleCov.root(root)
+load root.join('.simplecov')