1 files changed, 41 insertions, 4 deletions
diff --git a/test/ruby/test_case.rb b/test/ruby/test_case.rb
index f20d1dfd7e..9e8502fb27 100644
--- a/test/ruby/test_case.rb
+++ b/test/ruby/test_case.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 require 'test/unit'
 
 class TestCase < Test::Unit::TestCase
@@ -67,10 +68,13 @@ class TestCase < Test::Unit::TestCase
       assert(false)
     end
 
-    assert_raise(NameError) do
-      case
-      when false, *x, false
+    begin
+      verbose_bak, $VERBOSE = $VERBOSE, nil
+      assert_raise(NameError) do
+        eval("case; when false, *x, false; end")
       end
+    ensure
+      $VERBOSE = verbose_bak
     end
   end
 
@@ -80,7 +84,7 @@ class TestCase < Test::Unit::TestCase
     EOS
 
     assert_in_out_err(['-e', <<-EOS], '', %w[42], [])
-      class Fixnum; undef ===; def ===(o); p 42; true; end; end; case 1; when 1; end
+      class Integer; undef ===; def ===(o); p 42; true; end; end; case 1; when 1; end
     EOS
   end
 
@@ -101,6 +105,18 @@ class TestCase < Test::Unit::TestCase
     else
       assert(false)
     end
+    case 0
+    when 0r
+      assert(true)
+    else
+      assert(false)
+    end
+    case 0
+    when 0i
+      assert(true)
+    else
+      assert(false)
+    end
   end
 
   def test_method_missing
@@ -121,4 +137,25 @@ class TestCase < Test::Unit::TestCase
       end
     }
   end
+
+  module NilEqq
+    refine NilClass do
+      def === other
+        false
+      end
+    end
+  end
+
+  class NilEqqClass
+    using NilEqq
+
+    def eqq(a)
+      case a; when nil then nil; else :not_nil; end
+    end
+  end
+
+
+  def test_deoptimize_nil
+    assert_equal :not_nil, NilEqqClass.new.eqq(nil)
+  end
 end