Fix SimpleCov integration

features/support/env.rb

@@ -20,12 +20,12 @@
   # 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'
-  ENV["SIMPLECOV_COMMAND_NAME"] = command_name.to_s
+  set_environment_variable "SIMPLECOV_COMMAND_NAME", command_name.to_s
 
   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.
-  ENV["RUBYOPT"] = "-r#{simplecov_setup_pathname} #{ENV['RUBYOPT']}"
+  prepend_environment_variable "RUBYOPT", "-r#{simplecov_setup_pathname} "
 end

features/support/simplecov_setup.rb

@@ -2,13 +2,30 @@
 
 # @note this file is loaded in env.rb to setup simplecov using RUBYOPTs for
 # child processes and @in-process
+#
+# Current implementation slows down things immensely:
+#
+# On main:
+# bin/cucumber --format progress  192.97s user 34.46s system 79% cpu 4:47.10 total
+#
+# On fix-simplecov-integration: with SimpleFormatter
+# bin/cucumber --format progress  581.96s user 75.12s system 91% cpu 12:00.38 total
+#
+# On fix-simplecov-integration: with DumbFormatter
+# bin/cucumber --format progress  732.04s user 105.59s system 92% cpu 15:05.49 total
+#
 unless RUBY_PLATFORM.include?("java")
   require "simplecov"
   root = File.expand_path("../..", __dir__)
-  command_name = ENV["SIMPLECOV_COMMAND_NAME"] || "Cucumber Features"
-  SimpleCov.command_name(command_name)
   SimpleCov.root(root)
 
+  if (command_name = ENV["SIMPLECOV_COMMAND_NAME"])
+    SimpleCov.command_name(command_name)
+    SimpleCov.formatter SimpleCov::Formatter::SimpleFormatter
+  else
+    SimpleCov.command_name "Cucumber Features"
+  end
+
   # Run simplecov by default
   SimpleCov.start unless ENV.key? "ARUBA_NO_COVERAGE"
 end