diff --git a/app/models/repository/subversion.rb b/app/models/repository/subversion.rb
index 4cafe4fa5..fa60492c1 100644
--- a/app/models/repository/subversion.rb
+++ b/app/models/repository/subversion.rb
@@ -51,7 +51,7 @@ class Repository::Subversion < Repository
 
   # Returns a path relative to the url of the repository
   def relative_path(path)
-    path.gsub(Regexp.new("^\/?#{Regexp.escape(relative_url)}"), '')
+    path.gsub(Regexp.new("^/?#{Regexp.escape(relative_url)}"), '')
   end
 
   def fetch_changesets
diff --git a/test/helpers/application_helper_test.rb b/test/helpers/application_helper_test.rb
index 64ef8a2de..a5c533a4f 100644
--- a/test/helpers/application_helper_test.rb
+++ b/test/helpers/application_helper_test.rb
@@ -1411,7 +1411,7 @@ class ApplicationHelperTest < Redmine::HelperTest
       </code></pre>
     RAW
     expected = <<~EXPECTED
-      <pre><code class="ECMA_script syntaxhl" data-language=\"ECMA_script\"><span class="cm">/* Hello */</span><span class="nb">document</span><span class="p">.</span><span class="nx">write</span><span class="p">(</span><span class="dl">"</span><span class="s2">Hello World!</span><span class="dl">"</span><span class="p">);</span></code></pre>
+      <pre><code class="ECMA_script syntaxhl" data-language="ECMA_script"><span class="cm">/* Hello */</span><span class="nb">document</span><span class="p">.</span><span class="nx">write</span><span class="p">(</span><span class="dl">"</span><span class="s2">Hello World!</span><span class="dl">"</span><span class="p">);</span></code></pre>
     EXPECTED
     with_settings :text_formatting => 'textile' do
       assert_equal expected.gsub(%r{[\r\n\t]}, ''), textilizable(raw).gsub(%r{[\r\n\t]}, '')
@@ -1425,7 +1425,7 @@ class ApplicationHelperTest < Redmine::HelperTest
       </code></pre>
     RAW
     expected = <<~EXPECTED
-      <pre><code class=\"ruby syntaxhl\" data-language=\"ruby\"><span class=\"n\">x</span> <span class=\"o\">=</span> <span class=\"n\">a</span> <span class=\"o\">&amp;</span> <span class=\"n\">b</span></code></pre>
+      <pre><code class="ruby syntaxhl" data-language="ruby"><span class="n">x</span> <span class="o">=</span> <span class="n">a</span> <span class="o">&amp;</span> <span class="n">b</span></code></pre>
     EXPECTED
     with_settings :text_formatting => 'textile' do
       assert_equal expected.gsub(%r{[\r\n\t]}, ''), textilizable(raw).gsub(%r{[\r\n\t]}, '')
@@ -2214,7 +2214,7 @@ class ApplicationHelperTest < Redmine::HelperTest
                   "/projects/ecookbook/wiki/A_%22quoted%22_name",
                   :class => "wiki-page new"),
       '[[le français, c\'est super]]' =>
-          link_to("le français, c\'est super",
+          link_to("le français, c'est super",
                   "/projects/ecookbook/wiki/Le_fran%C3%A7ais_c'est_super",
                   :class => "wiki-page new"),
       '[[broken < less]]' =>
diff --git a/test/system/issues_test.rb b/test/system/issues_test.rb
index b987a95a1..6d19b65df 100644
--- a/test/system/issues_test.rb
+++ b/test/system/issues_test.rb
@@ -46,7 +46,7 @@ class IssuesSystemTest < ApplicationSystemTestCase
     assert_kind_of Issue, issue
 
     # check redirection
-    find 'div#flash_notice', :visible => true, :text => "Issue \##{issue.id} created."
+    find 'div#flash_notice', :visible => true, :text => "Issue ##{issue.id} created."
     assert_equal issue_path(:id => issue), current_path
 
     # check issue attributes
diff --git a/test/unit/lib/redmine/helpers/url_test.rb b/test/unit/lib/redmine/helpers/url_test.rb
index d927fd0a6..09d9b6c03 100644
--- a/test/unit/lib/redmine/helpers/url_test.rb
+++ b/test/unit/lib/redmine/helpers/url_test.rb
@@ -42,7 +42,7 @@ class URLTest < ActiveSupport::TestCase
     "mailto:foo@example.org",
     " http://example.com/",
     "",
-    "/javascript:alert(\'filename\')",
+    "/javascript:alert('filename')",
   ]
 
   def test_uri_with_link_safe_scheme_should_recognize_safe_uris
@@ -52,18 +52,18 @@ class URLTest < ActiveSupport::TestCase
   end
 
   LINK_UNSAFE_URIS = [
-    "javascript:alert(\'XSS\');",
-    "javascript    :alert(\'XSS\');",
-    "javascript:    alert(\'XSS\');",
-    "javascript    :   alert(\'XSS\');",
-    ":javascript:alert(\'XSS\');",
+    "javascript:alert('XSS');",
+    "javascript    :alert('XSS');",
+    "javascript:    alert('XSS');",
+    "javascript    :   alert('XSS');",
+    ":javascript:alert('XSS');",
     "javascript&#58;",
     "javascript&#0058;",
     "javascript&#x3A;",
     "javascript&#x003A;",
     "java\0script:alert(\"XSS\")",
     "java\script:alert(\"XSS\")",
-    " \x0e  javascript:alert(\'XSS\');",
+    " \x0e  javascript:alert('XSS');",
     "data:image/png;base64,foobar",
     "vbscript:foobar",
     "data:text/html;base64,foobar",
diff --git a/test/unit/lib/redmine/wiki_formatting/common_mark/formatter_test.rb b/test/unit/lib/redmine/wiki_formatting/common_mark/formatter_test.rb
index 2eeb28759..81d8acf5b 100644
--- a/test/unit/lib/redmine/wiki_formatting/common_mark/formatter_test.rb
+++ b/test/unit/lib/redmine/wiki_formatting/common_mark/formatter_test.rb
@@ -151,7 +151,7 @@ class Redmine::WikiFormatting::CommonMark::FormatterTest < ActionView::TestCase
         <p>This is some text<sup><a href="#fn-1" id="fnref-1">1</a></sup>.</p>
          <ol>
         <li id="fn-1">
-        <p>This is the foot note <a href="#fnref-1" aria-label=\"Back to content\">↩</a></p>
+        <p>This is the foot note <a href="#fnref-1" aria-label="Back to content">↩</a></p>
         </li>
         </ol>
       EXPECTED
diff --git a/test/unit/lib/redmine/wiki_formatting/textile_formatter_test.rb b/test/unit/lib/redmine/wiki_formatting/textile_formatter_test.rb
index 12e24b8a6..381cfdffc 100644
--- a/test/unit/lib/redmine/wiki_formatting/textile_formatter_test.rb
+++ b/test/unit/lib/redmine/wiki_formatting/textile_formatter_test.rb
@@ -512,12 +512,12 @@ class Redmine::WikiFormatting::TextileFormatterTest < ActionView::TestCase
     <<~STR.chomp,
       h2. Heading 2
 
-      <pre><code class=\"ruby\">
+      <pre><code class="ruby">
         def foo
         end
       </code></pre>
 
-      <pre><code><pre><code class=\"ruby\">
+      <pre><code><pre><code class="ruby">
         Place your code here.
       </code></pre>
       </code></pre>
@@ -693,7 +693,7 @@ class Redmine::WikiFormatting::TextileFormatterTest < ActionView::TestCase
       fn1. This is the foot note
     STR
     expected = <<~EXPECTED
-      <p>This is some text<sup><a href=\"#fn1\">1</a></sup>.</p>
+      <p>This is some text<sup><a href="#fn1">1</a></sup>.</p>
       <p id="fn1" class="footnote"><sup>1</sup> This is the foot note</p>
     EXPECTED
     assert_equal expected.gsub(%r{[\r\n\t]}, ''), to_html(text).gsub(%r{[\r\n\t]}, '')