1 files changed, 16 insertions, 1 deletions
diff --git a/mrbgems/mruby-eval/test/eval.rb b/mrbgems/mruby-eval/test/eval.rb
index be43412f7..8cf658f29 100644
--- a/mrbgems/mruby-eval/test/eval.rb
+++ b/mrbgems/mruby-eval/test/eval.rb
@@ -100,7 +100,22 @@ assert('Object#instance_eval with begin-rescue-ensure execution order') do
   assert_equal([:enter_raise_hell, :begin, :rescue, :ensure], hell_raiser.raise_hell)
 end
 
-assert('Kernel.#eval(strinng) Issue #4021') do
+assert('Kernel#instance_eval() to define singleton methods Issue #3141') do
+  foo_class = Class.new do
+    def bar(x)
+      instance_eval "def baz; #{x}; end"
+    end
+  end
+
+  f1 = foo_class.new
+  f2 = foo_class.new
+  f1.bar 1
+  f2.bar 2
+  assert_equal(1){f1.baz}
+  assert_equal(2){f2.baz}
+end
+
+assert('Kernel.#eval(string) Issue #4021') do
   assert_equal('FOO') { (eval <<'EOS').call }
 foo = "FOO"
 Proc.new { foo }