1 files changed, 12 insertions, 2 deletions
diff --git a/test/fiddle/test_function.rb b/test/fiddle/test_function.rb
index 0bb66f9b8d..742615a56b 100644
--- a/test/fiddle/test_function.rb
+++ b/test/fiddle/test_function.rb
@@ -21,6 +21,17 @@ module Fiddle
       assert_equal 'sin', func.name
     end
 
+    def test_need_gvl?
+      libruby = Fiddle.dlopen(nil)
+      rb_str_dup = Function.new(libruby['rb_str_dup'],
+                                [:voidp],
+                                :voidp,
+                                need_gvl: true)
+      assert(rb_str_dup.need_gvl?)
+      assert_equal('Hello',
+                   Fiddle.dlunwrap(rb_str_dup.call(Fiddle.dlwrap('Hello'))))
+    end
+
     def test_argument_errors
       assert_raise(TypeError) do
         Function.new(@libm['sin'], TYPE_DOUBLE, TYPE_DOUBLE)
@@ -111,8 +122,7 @@ module Fiddle
       n1 = f.call(nil, 0, msec)
       n2 = th.value
       t1 = Process.clock_gettime(Process::CLOCK_MONOTONIC, :millisecond)
-      delta = EnvUtil.apply_timeout_scale(180)
-      assert_in_delta(msec, t1 - t0, delta, 'slept amount of time')
+      assert_in_delta(msec, t1 - t0, 180, 'slept amount of time')
       assert_equal(0, n1, perror("poll(2) in main-thread"))
       assert_equal(0, n2, perror("poll(2) in sub-thread"))
     end