diff --git a/lib/mom/mom_collection.rb b/lib/mom/mom_collection.rb
index 991a7955..28e245c8 100644
--- a/lib/mom/mom_collection.rb
+++ b/lib/mom/mom_collection.rb
@@ -16,7 +16,7 @@ module Mom
 
     # lazily instantiate the compiler for init function
     def init_compiler
-      @init_compilers ||= create_init_compiler
+      @init_compilers ||= MomCollection.create_init_compiler
     end
 
     # Return all compilers, namely the MethodCompilers passed in, plus the
@@ -47,8 +47,8 @@ module Mom
      # - load fist message, set up Space as receiver
      # - call main, ie set up message for that etc
      # - exit (exit_sequence) which passes a machine int out to c
-     def create_init_compiler
-       compiler = self.class.compiler_for(:Object,:__init__ ,{})
+     def self.create_init_compiler
+       compiler = compiler_for(:Object,:__init__ ,{})
        compiler._reset_for_init # no return, just for init
        compiler.add_code Init.new("missing")
        return compiler
diff --git a/lib/rubyx/interpret.rb b/lib/rubyx/interpret.rb
index e0134fe4..485bdb3b 100644
--- a/lib/rubyx/interpret.rb
+++ b/lib/rubyx/interpret.rb
@@ -24,8 +24,10 @@ class RubyXC < Thor
     rescue
       fail MalformattedArgumentError , "No such file #{file}"
     end
+    code = get_preload + ruby
+
     compiler = RubyX::RubyXCompiler.new(extract_options)
-    linker = compiler.ruby_to_binary(ruby, :interpreter)
+    linker = compiler.ruby_to_binary(code, :interpreter)
 
     puts "interpreting #{file}"
 
diff --git a/lib/vool/basic_values.rb b/lib/vool/basic_values.rb
index b4eee094..aaca4a23 100644
--- a/lib/vool/basic_values.rb
+++ b/lib/vool/basic_values.rb
@@ -105,5 +105,8 @@ module Vool
     def ct_type
       Parfait.object_space.get_type_by_class_name(:Word)
     end
+    def to_s(depth = 0)
+      ":#{@value}"
+    end
   end
 end
diff --git a/lib/vool/builtin.rb b/lib/vool/builtin.rb
index efda20c7..735e645f 100644
--- a/lib/vool/builtin.rb
+++ b/lib/vool/builtin.rb
@@ -14,7 +14,6 @@ module Vool
       {
         "Object.get" => "def get_internal_word(at); X.get_internal_word;end",
         "Object.missing" => "def method_missing(at); X.method_missing;end",
-        "Object.init" => "def __init__(at); X.init;end",
         "Object.exit" => "def exit; X.exit;end",
         "Integer.div4" => "def div4; X.div4;end",
         "Integer.div10" => "def div10; X.div10;end",
@@ -32,7 +31,7 @@ module Vool
         "Word.put" => "def putstring(at); X.putstring;end",
         "Word.set" => "def set_internal_byte(at, val); X.set_internal_byte;end",
         "Word.get" => "def get_internal_byte(at); X.get_internal_byte;end",
-        "Space.main" => "def main(args);return;end",
+        "Space.main" => "def main(args);return nil;end",
       }
     end
     def self.builtin_code
diff --git a/test/elf/helper.rb b/test/elf/helper.rb
index 5cc834e1..490d2d04 100644
--- a/test/elf/helper.rb
+++ b/test/elf/helper.rb
@@ -3,10 +3,6 @@ require_relative "../helper"
 module Elf
 
   class FullTest < MiniTest::Test
-    DEBUG = false
-
-    def setup
-    end
 
     def in_space(input)
       "class Space; #{input} ; end"
diff --git a/test/mains/test_arm.rb b/test/mains/test_arm.rb
index ec187a84..e622985a 100644
--- a/test/mains/test_arm.rb
+++ b/test/mains/test_arm.rb
@@ -49,8 +49,9 @@ module Mains
 
     def run_code(input , name )
       puts "Compiling #{name}.o" if DEBUG
+      code = Vool::Builtin.builtin_code + input
 
-      linker = ::RubyX::RubyXCompiler.new({}).ruby_to_binary( input , :arm )
+      linker = ::RubyX::RubyXCompiler.new({}).ruby_to_binary( code , :arm )
       writer = Elf::ObjectWriter.new(linker)
 
       writer.save "mains.o"
diff --git a/test/mom/macro/test_init.rb b/test/mom/macro/test_init.rb
index 96888354..48421d1f 100644
--- a/test/mom/macro/test_init.rb
+++ b/test/mom/macro/test_init.rb
@@ -4,18 +4,19 @@ module Mom
   module Builtin
     class TestObjectInitRisc < BootTest
       def setup
-        super
-        @method = get_compiler("Object",:init)
+        Parfait.boot!(Parfait.default_test_options)
+        get_compiler("Space",:main)
+        @method = MomCollection.create_init_compiler
       end
       def test_mom_length
         assert_equal :__init__ , @method.callable.name
-        assert_equal 7 , @method.mom_instructions.length
+        assert_equal 2 , @method.mom_instructions.length
       end
       def test_compile
         assert_equal Risc::MethodCompiler , @method.to_risc.class
       end
       def test_risc_length
-        assert_equal 31 , @method.to_risc.risc_instructions.length
+        assert_equal 19 , @method.to_risc.risc_instructions.length
       end
     end
   end
diff --git a/test/ruby/test_basic_values.rb b/test/ruby/test_basic_values.rb
index 398321a7..e24ef963 100644
--- a/test/ruby/test_basic_values.rb
+++ b/test/ruby/test_basic_values.rb
@@ -99,7 +99,7 @@ module Ruby
       assert_equal "'string'" , compile_const( "'string'")
     end
     def test_sym
-      assert_equal "'symbol'" , compile_const( ":symbol")
+      assert_equal ":symbol" , compile_const( ":symbol")
     end
     def test_nil
       assert_equal "nil" , compile_const( "nil")
diff --git a/test/rubyx/test_compile.rb b/test/rubyx/test_compile.rb
new file mode 100644
index 00000000..da0f0d25
--- /dev/null
+++ b/test/rubyx/test_compile.rb
@@ -0,0 +1,11 @@
+require_relative "helper"
+require "rubyx/rubyxc"
+
+module RubyX
+  class TestRubyXCliCompile < MiniTest::Test
+
+    def test_compile
+      assert_output(/compiling/) {RubyXC.start(["compile" , "--preload","test/mains/source/add__4.rb"])}
+    end
+  end
+end
diff --git a/test/rubyx/test_execute.rb b/test/rubyx/test_execute.rb
new file mode 100644
index 00000000..df3ada08
--- /dev/null
+++ b/test/rubyx/test_execute.rb
@@ -0,0 +1,11 @@
+require_relative "helper"
+require "rubyx/rubyxc"
+
+module RubyX
+  class TestRubyXCliExecute < MiniTest::Test
+
+    def test_execute
+      assert_output(/Running/) {RubyXC.start(["execute" ,"--preload",  "test/mains/source/add__4.rb"])}
+    end
+  end
+end
diff --git a/test/rubyx/test_interpret.rb b/test/rubyx/test_interpret.rb
new file mode 100644
index 00000000..f8a3d861
--- /dev/null
+++ b/test/rubyx/test_interpret.rb
@@ -0,0 +1,11 @@
+require_relative "helper"
+require "rubyx/rubyxc"
+
+module RubyX
+  class TestRubyXCliInterpret < MiniTest::Test
+
+    def test_interpret
+      assert_output(/interpreting/) {RubyXC.start(["interpret" ,"--preload", "test/mains/source/add__4.rb"])}
+    end
+  end
+end
diff --git a/test/rubyx/test_rubyxc.rb b/test/rubyx/test_rubyxc.rb
index 58034461..3e391f59 100644
--- a/test/rubyx/test_rubyxc.rb
+++ b/test/rubyx/test_rubyxc.rb
@@ -13,21 +13,5 @@ module RubyX
     def test_file_fail
       assert_output(nil , /No such file/) {RubyXC.start(["compile" , "hi"])}
     end
-    def test_file_open
-      assert_output(/compiling/) {RubyXC.start(["compile" , "test/mains/source/add__4.rb"])}
-      #File.delete "add__4.o"
-    end
-    def test_interpret
-      assert_output(/interpreting/) {RubyXC.start(["interpret" , "test/mains/source/add__4.rb"])}
-    end
-    def test_execute
-      assert_output(/Running/) {RubyXC.start(["execute" , "test/mains/source/add__4.rb"])}
-    end
-    def test_stats
-      out, err = capture_io {RubyXC.start(["stats" , "test/mains/source/add__4.rb"])}
-      assert out.include?("Space") , out
-      assert out.include?("Total") , out
-      assert out.include?("Objects=") , out
-    end
   end
 end
diff --git a/test/rubyx/test_stats.rb b/test/rubyx/test_stats.rb
new file mode 100644
index 00000000..cfda2e3d
--- /dev/null
+++ b/test/rubyx/test_stats.rb
@@ -0,0 +1,14 @@
+require_relative "helper"
+require "rubyx/rubyxc"
+
+module RubyX
+  class TestRubyXCliStats < MiniTest::Test
+
+    def test_stats
+      out, err = capture_io {RubyXC.start(["stats" ,"--preload", "test/mains/source/add__4.rb"])}
+      assert out.include?("Space") , out
+      assert out.include?("Total") , out
+      assert out.include?("Objects=") , out
+    end
+  end
+end
diff --git a/test/vool/test_builtin.rb b/test/vool/test_builtin.rb
index 0f284e06..8e7766a7 100644
--- a/test/vool/test_builtin.rb
+++ b/test/vool/test_builtin.rb
@@ -6,7 +6,7 @@ module Vool
 
     def setup
       Parfait.boot!(Parfait.default_test_options)
-      @code = Macro.boot_methods({})
+      @code = Builtin.boot_methods({})
     end
     def as_ruby
       @ruby = Ruby::RubyCompiler.compile(@code)
diff --git a/test/vool/test_macro_expression.rb b/test/vool/test_macro_expression.rb
index 955f9a66..789c6fe8 100644
--- a/test/vool/test_macro_expression.rb
+++ b/test/vool/test_macro_expression.rb
@@ -7,6 +7,9 @@ module Mom
       @a = arg
       @b = b
     end
+    def to_risc(compiler)
+      Risc.label("some" , "thing")
+    end
   end
 end
 
@@ -30,6 +33,10 @@ module Vool
       assert_equal  Vool::IntegerConstant , @ins.b.class
       assert_equal  1 , @ins.b.value
     end
+    def test_to_risc
+      comp = @compiler.to_risc
+      assert_equal Risc::MethodCompiler , comp.class
+      assert_equal :main , comp.callable.name
+    end
   end
-
 end