From 4d3502d57f53d5cd54452d9b19475944055989f4 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Fri, 27 Sep 2019 14:01:37 +0900
Subject: More tests for [Feature #16150]

---
 test/ruby/test_object.rb | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'test')

diff --git a/test/ruby/test_object.rb b/test/ruby/test_object.rb
index fcb6c2826f..013b3f01f5 100644
--- a/test/ruby/test_object.rb
+++ b/test/ruby/test_object.rb
@@ -132,6 +132,27 @@ class TestObject < Test::Unit::TestCase
     assert_equal(0.0, nil.to_f)
   end
 
+  def test_nil_to_s
+    str = nil.to_s
+    assert_equal("", str)
+    assert_predicate(str, :frozen?)
+    assert_same(str, nil.to_s)
+  end
+
+  def test_true_to_s
+    str = true.to_s
+    assert_equal("true", str)
+    assert_predicate(str, :frozen?)
+    assert_same(str, true.to_s)
+  end
+
+  def test_false_to_s
+    str = false.to_s
+    assert_equal("false", str)
+    assert_predicate(str, :frozen?)
+    assert_same(str, false.to_s)
+  end
+
   def test_not
     assert_equal(false, Object.new.send(:!))
     assert_equal(true, nil.send(:!))
-- 
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