generate mains test methods according to file name

test/mains/helper.rb

@@ -5,16 +5,10 @@ module Mains
     include Risc::Ticker
     def setup;end
 
-    def run_main_file(file)
-      file_name = Dir["test/mains/source/#{file}*.rb"].first
-      assert file_name , "no file #{file_name}"
-      input = File.read(file_name)
-      basename = file_name.split("/").last.split(".").first
-      _ , stdout , exit_code = basename.split("_")
-      stdout = "" unless stdout
+    def run_main_check(input , stdout , exit_code)
       run_main(input)
-      assert_equal stdout , @interpreter.stdout , "Wrong stdout for #{file}"
-      assert_equal exit_code , get_return.to_s , "Wrong exit code for #{file}"
+      assert_equal stdout , @interpreter.stdout , "Wrong stdout"
+      assert_equal exit_code , get_return.to_s , "Wrong exit code"
     end
   end
 end

test/mains/test_adds.rb

@@ -1,16 +0,0 @@
-require_relative 'helper'
-
-module Mains
-  class TestAdds < MainsTest
-
-    def test_ruby_adds
-      run_main_file "adds"
-    end
-    def test_ruby_subs
-      run_main_file "subs"
-    end
-    def test_ruby_adds_fibo
-      run_main_file "fibo"
-    end
-  end
-end

test/mains/test_interpreted.rb

@@ -0,0 +1,28 @@
+require_relative 'helper'
+
+module Mains
+  class TestInterpreted < MiniTest::Test
+      include Risc::Ticker
+      def setup;end
+
+    # runnable_methods is called by minitest to determine which tests to run
+    def self.runnable_methods
+      all = Dir["test/mains/source/*.rb"]
+      tests =[]
+      all.each do |file_name|
+        fullname = file_name.split("/").last.split(".").first
+        name , stdout , exit_code = fullname.split("_")
+        method_name = "test_#{name}"
+        tests << method_name
+        input = File.read(file_name)
+        self.send(:define_method, method_name ) do
+          run_main(input)
+          assert_equal stdout , @interpreter.stdout , "Wrong stdout #{name}"
+          assert_equal exit_code , get_return.to_s , "Wrong exit code #{name}"
+        end
+      end
+      tests
+    end
+
+  end
+end