1 files changed, 6 insertions, 0 deletions
diff --git a/test/optparse/test_reqarg.rb b/test/optparse/test_reqarg.rb
index d5686d13aa..31d4fef417 100644
--- a/test/optparse/test_reqarg.rb
+++ b/test/optparse/test_reqarg.rb
@@ -6,6 +6,7 @@ module TestOptionParserReqArg
     super
     @opt.def_option "--with_underscore=VAL" do |x| @flag = x end
     @opt.def_option "--with-hyphen=VAL" do |x| @flag = x end
+    @opt.def_option("--lambda=VAL", &->(x) {@flag = x})
   end
 
   class Def1 < TestOptionParser
@@ -81,6 +82,11 @@ module TestOptionParserReqArg
     assert_equal("foo4", @flag)
   end
 
+  def test_lambda
+    assert_equal(%w"", no_error {@opt.parse!(%w"--lambda=lambda1")})
+    assert_equal("lambda1", @flag)
+  end
+
   class TestOptionParser::WithPattern < TestOptionParser
     def test_pattern
       pat = num = nil