1 files changed, 38 insertions, 0 deletions
diff --git a/test/ruby/test_case.rb b/test/ruby/test_case.rb
index 41a22038a0..98498dada6 100644
--- a/test/ruby/test_case.rb
+++ b/test/ruby/test_case.rb
@@ -1,4 +1,5 @@
 require 'test/unit'
+require_relative 'envutil.rb'
 
 class TestCase < Test::Unit::TestCase
   def test_case
@@ -45,5 +46,42 @@ class TestCase < Test::Unit::TestCase
     else
       assert(false)
     end
+
+    case "+"
+    when *%w/. +/
+      assert(true)
+    else
+      assert(false)
+    end
+
+    case
+    when *[], false
+      assert(false)
+    else
+      assert(true)
+    end
+
+    case
+    when *false, []
+      assert(true)
+    else
+      assert(false)
+    end
+
+    assert_raise(NameError) do
+      case
+      when false, *x, false
+      end
+    end
+  end
+
+  def test_deoptimization
+    assert_in_out_err(['-e', <<-EOS], '', %w[42], [])
+      class Symbol; undef ===; def ===(o); p 42; true; end; end; case :foo; when :foo; end
+    EOS
+
+    assert_in_out_err(['-e', <<-EOS], '', %w[42], [])
+      class Fixnum; undef ===; def ===(o); p 42; true; end; end; case 1; when 1; end
+    EOS
   end
 end