Move Kernel#__send__ test to core from mruby-metaprog

mrbgems/mruby-metaprog/test/metaprog.rb

@@ -1,17 +1,3 @@
-assert('Kernel#__send__', '15.3.1.3.4') do
-  # test with block
-  l = __send__(:lambda) do
-    true
-  end
-
-  assert_true l.call
-  assert_equal Proc, l.class
-  # test with argument
-  assert_true __send__(:respond_to?, :nil?)
-  # test without argument and without block
-  assert_equal String, __send__(:to_s).class
-end
-
 assert('Kernel#send', '15.3.1.3.44') do
   # test with block
   l = send(:lambda) do

test/t/kernel.rb

@@ -88,6 +88,20 @@ assert('Kernel#__id__', '15.3.1.3.3') do
   assert_equal Fixnum, __id__.class
 end
 
+assert('Kernel#__send__', '15.3.1.3.4') do
+  # test with block
+  l = __send__(:lambda) do
+    true
+  end
+
+  assert_true l.call
+  assert_equal Proc, l.class
+  # test with argument
+  assert_true __send__(:respond_to?, :nil?)
+  # test without argument and without block
+  assert_equal String, __send__(:to_s).class
+end
+
 assert('Kernel#block_given?', '15.3.1.3.6') do
   def bg_try(&b)
     if block_given?