* test/dl/test_callback.rb (**) adding a callback test file

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@25687 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/dl/test_callback.rb

@@ -0,0 +1,32 @@
+require_relative 'test_base'
+require_relative '../ruby/envutil'
+
+module DL
+  class TestCallback < TestBase
+    include DL
+
+    def test_callback_with_string
+      called_with = nil
+      addr = set_callback(TYPE_VOID, 1) do |str|
+        called_with = dlunwrap(str)
+      end
+      func = CFunc.new(addr, TYPE_VOID, 'test')
+
+      func.call([dlwrap('foo')])
+      assert_equal 'foo', called_with
+    end
+
+    def test_call_callback
+      called = false
+
+      addr = set_callback(TYPE_VOID, 0) do
+        called = true
+      end
+
+      func = CFunc.new(addr, TYPE_VOID, 'test')
+      func.call([])
+
+      assert called, 'function should be called'
+    end
+  end
+end