First part of int allocation

implemented allocate_int
instead of add_new_int

test/risc/test_builder.rb

@@ -28,6 +28,11 @@ module Risc
     def test_not_alloc_space
       assert_raises {@builder.space}
     end
+    def test_reset
+      assert_equal :r1 , @builder.integer!.symbol
+      @builder.reset_names
+      assert_equal :r1 , @builder.integer!.symbol  # would raise if it existed
+    end
     def test_next_message
       reg = @builder.next_message!
       assert_equal :r1 , reg.symbol

test/risc/test_builder1.rb

@@ -32,5 +32,13 @@ module Risc
       assert_equal :Integer ,  @builder.space.type.class_name
       assert_equal :Space ,  @builder.integer.type.class_name
     end
+    def test_allocate_returns
+      int = @builder.allocate_int
+      assert_equal :r1 , int.symbol
+    end
+    def test_allocate_len
+      int = @builder.allocate_int
+      assert_equal 41 , @builder.compiler.risc_instructions.length
+    end
   end
 end