Use omit instead of ractor

Author: kou

test/fiddle/test_closure.rb

@@ -158,8 +158,14 @@ def call
       end
     end
 
-    ractor def test_ractor_shareable
-      Closure.create(:int, [:void]) do |c|
+    def test_ractor_shareable
+      omit("Need Ractor") unless defined?(Ractor)
+      closure_class = Class.new(Closure) do
+        def call
+          0
+        end
+      end
+      closure_class.create(:int, [:void]) do |c|
         assert_ractor_shareable(c)
       end
     end

test/fiddle/test_function.rb

@@ -259,7 +259,8 @@ def test_no_memory_leak
       end
     end
 
-    ractor def test_ractor_shareable
+    def test_ractor_shareable
+      omit("Need Ractor") unless defined?(Ractor)
       assert_ractor_shareable(Function.new(@libm['sin'], [TYPE_DOUBLE], TYPE_DOUBLE))
     end
 

test/fiddle/test_handle.rb

@@ -227,7 +227,8 @@ def test_fallback_to_ansi
       end
     end
 
-    ractor def test_ractor_shareable
+    def test_ractor_shareable
+      omit("Need Ractor") unless defined?(Ractor)
       assert_ractor_shareable(Fiddle::Handle.new(LIBC_SO))
     end
   end

test/fiddle/test_memory_view.rb

@@ -160,7 +160,8 @@ def test_to_s
       end
     end
 
-    ractor def test_ractor_shareable
+    def test_ractor_shareable
+      omit("Need Ractor") unless defined?(Ractor)
       ptr = Pointer["hello world"]
       assert_ractor_shareable MemoryView.new(ptr)
       assert_predicate ptr, :frozen?

test/fiddle/test_pinned.rb

@@ -24,7 +24,8 @@ def test_clear
       assert_match "called on", ex.message
     end
 
-    ractor def test_ractor_shareable
+    def test_ractor_shareable
+      omit("Need Ractor") unless defined?(Ractor)
       obj = Object.new
       assert_ractor_shareable(Pinned.new(obj))
       assert_predicate obj, :frozen?

test/fiddle/test_pointer.rb

@@ -306,7 +306,8 @@ def test_null_pointer
       assert_raise(DLError) {nullpo[0] = 1}
     end
 
-    ractor def test_ractor_shareable
+    def test_ractor_shareable
+      omit("Need Ractor") unless defined?(Ractor)
       assert_ractor_shareable(Fiddle::NULL)
       ary = [0,1,2,4,5]
       addr = Pointer.new(dlwrap(ary))