Move simplecov setup to test_helper to try compatibility with codeclimate

Author: Vladimir Dobriakov

Rakefile

@@ -8,13 +8,6 @@ Rake::TestTask.new(:test) do |t|
   t.verbose = true
   t.warning = true
   t.test_files = FileList["test/**/*_test.rb"]
-
-  # Require and start simplecov BEFORE minitest/autorun loads ./lib to get correct test results.
-  # Otherwise lot of executed lines are not detect.
-  require 'simplecov'
-  SimpleCov.start do
-    add_filter 'test'
-  end
 end
 
 Rake::RDocTask.new do |rdoc|

test/test_helper.rb

@@ -1,3 +1,10 @@
+# Require and start simplecov BEFORE minitest/autorun loads ./lib to get correct test results.
+# Otherwise lot of executed lines are not detected.
+require 'simplecov'
+SimpleCov.start do
+  add_filter 'test'
+end
+
 require 'minitest/autorun'
 
 class << Minitest::Test