rename meta to singleton class

seems more appropriate, as it is the class for a single object
Also seems to be called that on the net (don't remember where the meta came from, but it's gone)

test/parfait/test_singleton_class.rb

@@ -0,0 +1,53 @@
+require_relative "helper"
+
+module Parfait
+  class TestSingletonClass < ParfaitTest
+
+    def setup
+      super
+      @try = @space.create_class( :Try , :Object).singleton_class
+    end
+
+    def test_type_forclass
+      assert_equal "Class(Space)" ,  @space.get_type.object_class.inspect
+      assert_equal :Space ,          @space.get_type.object_class.name
+    end
+    def test_new_superclass_name
+      assert_equal :Object , @try.clazz.super_class_name
+    end
+    def test_new_superclass
+      assert_equal "Class(Try)" , @try.clazz.inspect
+      assert_equal "SingletonClass(Try)" , @try.inspect
+    end
+    def test_new_methods
+      assert_equal @try.method_names.class, @try.instance_methods.class
+      assert_equal @try.method_names.get_length , @try.instance_methods.get_length
+    end
+    def test_remove_nothere
+      assert  !@try.remove_instance_method(:foo)
+    end
+    def test_resolve
+      assert_nil @try.resolve_method :foo
+    end
+    def test_remove_method
+      assert_equal false , @try.remove_instance_method( :foo)
+    end
+    def test_add_nil_method_raises
+      assert_raises{ @try.add_instance_method(nil)}
+    end
+    def test_add_instance_variable_changes_type
+      before = @try.instance_type
+      @try.add_instance_variable(:counter , :Integer)
+      assert before != @try.instance_type
+    end
+    def test_add_instance_variable_changes_type_hash
+      before = @try.instance_type.hash
+      @try.add_instance_variable(:counter , :Integer)
+      assert before != @try.instance_type.hash
+    end
+    def test_add_instance_variable_changes_class_type
+      @try.add_instance_variable(:counter , :Integer)
+      assert_equal @try.clazz.type , @try.instance_type
+    end
+  end
+end