basic immutability for type

add_instance_variable now uses global type list to check
adds hash and to_has functions
use backdoor (send) for booting

test/typed/type/test_basic.rb

@@ -70,7 +70,7 @@ class BasicType < MiniTest::Test
 
   def test_add_name
     type = Parfait::Type.new Register.machine.space.get_class_by_name(:Type)
-    type.add_instance_variable :boo , :Object
+    type.send(:private_add_instance_variable, :boo , :Object)
     assert_equal 2 , type.variable_index(:boo)
     assert_equal 4 , type.get_length
     assert_equal :type , type.get(1)

test/typed/type/test_hash.rb

@@ -0,0 +1,49 @@
+require_relative "../helper"
+
+class TypeHash < MiniTest::Test
+
+  def setup
+    @types = Register.machine.boot.space.types
+    @first = @types.values.first
+  end
+
+  def test_hash
+    assert_equal Parfait::Dictionary , @types.class
+  end
+
+  def test_length
+    assert_equal 16 , @types.length
+  end
+
+  def test_two_hashs_not_equal
+    assert @types.keys.last != @types.keys.first
+  end
+
+  def test_name
+    assert_equal "Word_Type" , @types.values.first.name
+  end
+
+  def test_to_hash
+    hash = @first.to_hash
+    assert_equal hash[:type] , :Word
+    assert_equal hash[:char_length] , :Integer
+    assert_equal 2 , @first.instance_length
+  end
+
+  def test_hashcode_with_hash
+    assert_equal @first.hash , Parfait::Type.hash_code_for( @first.to_hash)
+  end
+
+  def test_second_hash_different
+    hash2 = @first.to_hash
+    hash2[:random] = :Type
+    assert @first.hash != Parfait::Type.hash_code_for( hash2 )
+  end
+
+  def test_add_is_different
+    type = @first.add_instance_variable :random , :Integer
+    assert type != @first , "new: #{type.inspect} , old: #{@first.inspect}"
+    assert @first.hash != type.hash
+  end
+
+end