replace fake compiler with real

less room for error

test/risc/test_callable_compiler.rb

@@ -11,8 +11,7 @@ module Risc
   class TestCallableCompiler < MiniTest::Test
     def setup
       Parfait.boot!({})
-      label = SlotMachine::Label.new("hi","ho")
-      @compiler = CallableCompiler.new(FakeCallable.new  , label)
+      @compiler = Risc.test_compiler
     end
     def test_ok
       assert @compiler
@@ -22,7 +21,7 @@ module Risc
     end
     def test_current_label
       assert_equal Label , @compiler.current.class
-      assert_equal "ho" , @compiler.current.name
+      assert_equal "start_label" , @compiler.current.name
     end
     def test_slot
       assert @compiler.risc_instructions

test/risc/test_register_value1.rb

@@ -7,7 +7,7 @@ module Risc
       Parfait.boot!(Parfait.default_test_options)
       @r0 = RegisterValue.new(:r0 , :Message)
       @r1 = RegisterValue.new(:r1 , :Space)
-      @compiler = FakeCompiler.new
+      @compiler = Risc.test_compiler
     end
 
     def test_resolves_index_ok