extract setup for mains test

test/risc/mains/helper.rb

@@ -0,0 +1,8 @@
+require_relative '../helper'
+
+module Mains
+  class MainsTest < MiniTest::Test
+    include Risc::Ticker
+    def setup;end
+  end
+end

test/risc/mains/test_adds.rb

@@ -1,9 +1,7 @@
-require_relative '../helper'
+require_relative 'helper'
 
 module Mains
-  class TestAdds < MiniTest::Test
-    include Risc::Ticker
-    def setup;end
+  class TestAdds < MainsTest
 
     def test_ruby_adds
       run_main <<HERE

test/risc/mains/test_puts.rb

@@ -1,9 +1,7 @@
 require_relative '../helper'
 
 module Mains
-  class TestPuts < MiniTest::Test
-    include Risc::Ticker
-    def setup;end
+  class TestPuts < MainsTest
 
     def test_say_hi
       hi = "Hello there"