diff --git a/test/unit/lib/redmine/unified_diff_test.rb b/test/unit/lib/redmine/unified_diff_test.rb
index 87e9d072f..53138b4cf 100644
--- a/test/unit/lib/redmine/unified_diff_test.rb
+++ b/test/unit/lib/redmine/unified_diff_test.rb
@@ -92,12 +92,12 @@ class Redmine::UnifiedDiffTest < ActiveSupport::TestCase
     raw = <<~DIFF
       --- test.orig.txt Wed Feb 15 16:10:39 2012
       +++ test.new.txt  Wed Feb 15 16:11:25 2012
-      @@ -1,5 +1,5 @@
+      @@ -1,4 +1,4 @@
        Semicolons were mysteriously appearing in code diffs in the repository
-        
+       ```
       -void DoSomething(std::auto_ptr<MyClass> myObj)
       +void DoSomething(const MyClass& myObj)
-       
+       ```
     DIFF
     diff = Redmine::UnifiedDiff.new(raw, :type => 'sbs')
     assert_equal 1, diff.size
@@ -385,7 +385,7 @@ class Redmine::UnifiedDiffTest < ActiveSupport::TestCase
   end
 
   def test_keep_similar_git_footer_line
-    raw = <<~'DIFF'
+    raw = <<~DIFF
       diff --git a/test1.txt b/test1.txt
       --- a/test1.txt
       +++ b/test1.txt
@@ -395,22 +395,22 @@ class Redmine::UnifiedDiffTest < ActiveSupport::TestCase
        $ cd git_utf8_repository_hg
       --
       -Next line has white space after '-'
-      -- 
+      --\s
       ---
       --
        $ touch test.txt
        $ hg add test.txt
-       $ hg commit -m `echo -e "U+1F603\U1F603"` -u `echo -e "U+1F603\U1F603"`
+       $ hg commit -m `echo -e "U+1F603\\U1F603"` -u `echo -e "U+1F603\\U1F603"`
       diff --git a/test2.txt b/test2.txt
       --- a/test2.txt
       +++ b/test2.txt
       @@ -5,9 +5,4 @@
        $ hg add test.txt
-       $ hg commit -m `echo -e "U+1F603\U1F603"` -u `echo -e "U+1F603\U1F603"`
+       $ hg commit -m `echo -e "U+1F603\\U1F603"` -u `echo -e "U+1F603\\U1F603"`
        $ hg bookmark master
       --
       -Next line has white space after '-'
-      -- 
+      --\s
       ---
       --
        $ hg push ../git_utf8_repository
@@ -425,12 +425,12 @@ class Redmine::UnifiedDiffTest < ActiveSupport::TestCase
   end
 
   def test_git_footer_line
-    raw = <<~'DIFF'
+    raw = <<~DIFF
       From 1ed13eda266a3e0a5a8624e79ae28874ebcdeb5c Mon Sep 17 00:00:00 2001
       From: test <none@none>
       Date: Thu, 30 Apr 2020 11:40:20 +0900
       Subject: [PATCH] add 'rpm -q git' and its result
-      
+
       ---
        test.txt | 2 ++
        1 file changed, 2 insertions(+)
@@ -440,14 +440,14 @@ class Redmine::UnifiedDiffTest < ActiveSupport::TestCase
       --- a/test.txt
       +++ b/test.txt
       @@ -6,3 +6,5 @@ $ hg add test.txt
-       $ hg commit -m `echo -e "U+1F603\U1F603"` -u `echo -e "U+1F603\U1F603"`
+       $ hg commit -m `echo -e "U+1F603\\U1F603"` -u `echo -e "U+1F603\\U1F603"`
        $ hg bookmark master
        $ hg push ../git_utf8_repository
       +$ rpm -q git
       +git-1.8.3.1-21.el7_7.x86_64
-      -- 
+      --\s
       1.8.3.1
-      
+
     DIFF
     lines = raw.split("\n")
     lines << ""