From 3cf23c3f891e2e81c977ea4ab83b62bc2a444b70 Mon Sep 17 00:00:00 2001
From: Akira Matsuda <ronnie@dio.jp>
Date: Thu, 5 Jan 2023 05:25:37 +0900
Subject: [PATCH] Implement SafeBuffer#bytesplice

---
 .../core_ext/string/output_safety.rb          |  4 +++
 .../test/core_ext/string_ext_test.rb          | 30 +++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/activesupport/test/core_ext/string_ext_test.rb b/activesupport/test/core_ext/string_ext_test.rb
index a51f2f64cbe27..c436821c94a0b 100644
--- a/activesupport/test/core_ext/string_ext_test.rb
+++ b/activesupport/test/core_ext/string_ext_test.rb
@@ -987,6 +987,36 @@ def to_s
     assert_predicate string, :html_safe?
   end
 
+  if "".respond_to?(:bytesplice)
+    test "Bytesplicing safe into safe yields safe" do
+      string = "hello".html_safe
+      string.bytesplice(0, 0, "<b>".html_safe)
+
+      assert_equal "<b>hello", string
+      assert_predicate string, :html_safe?
+
+      string = "hello".html_safe
+      string.bytesplice(0..1, "<b>".html_safe)
+
+      assert_equal "<b>llo", string
+      assert_predicate string, :html_safe?
+    end
+
+    test "Bytesplicing unsafe into safe yields escaped safe" do
+      string = "hello".html_safe
+      string.bytesplice(1, 0, "<b>")
+
+      assert_equal "h&lt;b&gt;ello", string
+      assert_predicate string, :html_safe?
+
+      string = "hello".html_safe
+      string.bytesplice(1..2, "<b>")
+
+      assert_equal "h&lt;b&gt;lo", string
+      assert_predicate string, :html_safe?
+    end
+  end
+
   test "emits normal string yaml" do
     assert_equal "foo".to_yaml, "foo".html_safe.to_yaml(foo: 1)
   end