diff --git a/scripts/test/EmailParser/MultipartMixed.t b/scripts/test/EmailParser/MultipartMixed.t
index 5ad640b85c..f795ee316f 100644
--- a/scripts/test/EmailParser/MultipartMixed.t
+++ b/scripts/test/EmailParser/MultipartMixed.t
@@ -26,7 +26,8 @@ use Test2::V0;
 
 # OTOBO modules
 use Kernel::System::UnitTest::RegisterOM;    # Set up $Kernel::OM
-use Kernel::System::EmailParser ();
+use Kernel::System::EmailParser    ();
+use Kernel::System::UnitTest::Diff qw(TextEqOrDiff);
 
 my $Home = $Kernel::OM->Get('Kernel::Config')->Get('Home');
 
@@ -237,7 +238,7 @@ Cheers,<BR>
 /* OTOBO is a web-based ticketing system for service organisations.
 
 Copyright (C) 2001-2020 OTRS AG, https://otrs.com/
-Copyright (C) 2019-2024 Rother OSS GmbH, https://otobo.io/
+Copyright (C) 2019-2025 Rother OSS GmbH, https://otobo.io/
 
 This program is free software: you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -284,7 +285,7 @@ for my $Test (@Tests) {
     );
 
     my $Body = $EmailParserObject->GetMessageBody;
-    is(
+    TextEqOrDiff(
         $Body,
         $Test->{Body},
         "$Test->{Name} - body (line $Test->{Line})",
@@ -299,6 +300,15 @@ for my $Test (@Tests) {
         }
     }
 
+    # Explicitily compare the content of the attachments with TextEqOrDiff(),
+    # just so potential diffs can be more easily inspected
+    for my $i ( 0 .. $Test->{Attachments}->$#* ) {
+        TextEqOrDiff(
+            $Attachments[$i]->{Content},
+            $Test->{Attachments}->[$i]->{Content},
+            "$Test->{Name} - attachment $i (line $Test->{Line})"
+        );
+    }
     is(
         \@Attachments,
         $Test->{Attachments},
diff --git a/scripts/test/Layout/RichTextDocumentComplete.t b/scripts/test/Layout/RichTextDocumentComplete.t
index 97728aefee..55c34e9e0a 100644
--- a/scripts/test/Layout/RichTextDocumentComplete.t
+++ b/scripts/test/Layout/RichTextDocumentComplete.t
@@ -26,6 +26,7 @@ use Test2::V0;
 
 # OTOBO modules
 use Kernel::System::UnitTest::RegisterOM;    # Set up $Kernel::OM
+use Kernel::System::UnitTest::Diff qw(TextEqOrDiff);
 
 # get layout object
 my $LayoutObject = $Kernel::OM->Get('Kernel::Output::HTML::Layout');
@@ -43,7 +44,7 @@ my @Tests = (
 /* OTOBO is a web-based ticketing system for service organisations.
 
 Copyright (C) 2001-2020 OTRS AG, <a href="https://otrs.com/" target="_blank" title="https://otrs.com/">https://otrs.com/</a>
-Copyright (C) 2019-2024 Rother OSS GmbH, <a href="https://otobo.io/" target="_blank" title="https://otobo.io/">https://otobo.io/</a>
+Copyright (C) 2019-2025 Rother OSS GmbH, <a href="https://otobo.io/" target="_blank" title="https://otobo.io/">https://otobo.io/</a>
 
 This program is free software: you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -70,7 +71,7 @@ END_HTML
 /* OTOBO is a web-based ticketing system for service organisations.
 
 Copyright (C) 2001-2020 OTRS AG, <a href="https://otrs.com/" target="_blank" title="https://otrs.com/">https://otrs.com/</a>
-Copyright (C) 2019-2024 Rother OSS GmbH, <a href="https://otobo.io/" target="_blank" title="https://otobo.io/">https://otobo.io/</a>
+Copyright (C) 2019-2025 Rother OSS GmbH, <a href="https://otobo.io/" target="_blank" title="https://otobo.io/">https://otobo.io/</a>
 
 This program is free software: you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -97,7 +98,7 @@ END_HTML
 /* OTOBO is a web-based ticketing system for service organisations.
 
 Copyright (C) 2001-2020 OTRS AG, <a href="https://otrs.com/" target="_blank" title="https://otrs.com/">https://otrs.com/</a>
-Copyright (C) 2019-2024 Rother OSS GmbH, <a href="https://otobo.io/" target="_blank" title="https://otobo.io/">https://otobo.io/</a>
+Copyright (C) 2019-2025 Rother OSS GmbH, <a href="https://otobo.io/" target="_blank" title="https://otobo.io/">https://otobo.io/</a>
 
 This program is free software: you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -123,7 +124,7 @@ END_HTML
 /* OTOBO is a web-based ticketing system for service organisations.
 
 Copyright (C) 2001-2020 OTRS AG, <a href="https://otrs.com/" target="_blank" title="https://otrs.com/">https://otrs.com/</a>
-Copyright (C) 2019-2024 Rother OSS GmbH, <a href="https://otobo.io/" target="_blank" title="https://otobo.io/">https://otobo.io/</a>
+Copyright (C) 2019-2025 Rother OSS GmbH, <a href="https://otobo.io/" target="_blank" title="https://otobo.io/">https://otobo.io/</a>
 
 This program is free software: you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -143,7 +144,7 @@ for my $Test (@Tests) {
     my $HTMLString = $LayoutObject->RichTextDocumentComplete(
         String => $Test->{String},
     );
-    is(
+    TextEqOrDiff(
         "$HTMLString\n",
         $Test->{Result},
         "$Test->{Name} (line $Test->{Line})",
diff --git a/scripts/test/Loader.t b/scripts/test/Loader.t
index 3bf2956e52..c668c5d4f8 100644
--- a/scripts/test/Loader.t
+++ b/scripts/test/Loader.t
@@ -26,6 +26,7 @@ use Test2::V0;
 
 # OTOBO modules
 use Kernel::System::UnitTest::RegisterOM;    # Set up $Kernel::OM
+use Kernel::System::UnitTest::Diff qw(TextEqOrDiff);
 use Kernel::Config;
 
 # the question whether there is a S3 backend must the resolved early
@@ -64,7 +65,7 @@ my $Home = $ConfigObject->Get('Home');
 
     my $MinifiedCSS = $LoaderObject->MinifyCSS( Code => $CSS );
 
-    is( $MinifiedCSS, $ExpectedCSS, 'MinifyCSS()' );
+    TextEqOrDiff( $MinifiedCSS, $ExpectedCSS, 'MinifyCSS()' );
 
     # empty cache
     $Kernel::OM->Get('Kernel::System::Cache')->CleanUp(
@@ -81,8 +82,8 @@ my $Home = $ConfigObject->Get('Home');
         Type     => 'CSS',
     );
 
-    is( $MinifiedCSSFile, $ExpectedCSS, 'GetMinifiedFile() for CSS, no cache' );
-    is( $MinifiedCSSFile, $ExpectedCSS, 'GetMinifiedFile() for CSS, with cache' );
+    TextEqOrDiff( $MinifiedCSSFile, $ExpectedCSS, 'GetMinifiedFile() for CSS, no cache' );
+    TextEqOrDiff( $MinifiedCSSFile, $ExpectedCSS, 'GetMinifiedFile() for CSS, with cache' );
 }
 
 {
@@ -103,7 +104,7 @@ my $Home = $ConfigObject->Get('Home');
     $ExpectedJS =~ s{\r\n}{\n}xmsg;
     chomp $ExpectedJS;    # newline after the last line
 
-    is( $MinifiedJS, $ExpectedJS, 'MinifyJavaScript()' );
+    TextEqOrDiff( $MinifiedJS, $ExpectedJS, 'MinifyJavaScript()' );
 }
 
 {
@@ -151,7 +152,7 @@ my $Home = $ConfigObject->Get('Home');
     $Expected =~ s{\r\n}{\n}xmsg;
     $Expected =~ s{\n$}{};          # newline after the last line
 
-    is( $MinifiedJS, $Expected, 'MinifyFiles() result content' );
+    TextEqOrDiff( $MinifiedJS, $Expected, 'MinifyFiles() result content' );
 
     $MainObject->FileDelete(
         Location => $ConfigObject->Get('TempDir') . "/$MinifiedJSFilename",
@@ -173,7 +174,7 @@ for my $Test (@JSTests) {
     my $Result = $LoaderObject->MinifyJavaScript(
         Code => $Test->{Source},
     );
-    is( $Result, $Test->{Result}, $Test->{Name} );
+    TextEqOrDiff( $Result, $Test->{Result}, $Test->{Name} );
 }
 
 done_testing;
diff --git a/scripts/test/TemplateGenerator/AutoResponse.t b/scripts/test/TemplateGenerator/AutoResponse.t
index 946cef64a0..f0d1135865 100644
--- a/scripts/test/TemplateGenerator/AutoResponse.t
+++ b/scripts/test/TemplateGenerator/AutoResponse.t
@@ -27,6 +27,7 @@ use Test2::V0;
 # OTOBO modules
 use Kernel::System::UnitTest::MockTime qw(FixedTimeSet);
 use Kernel::System::UnitTest::RegisterOM;    # Set up $Kernel::OM
+use Kernel::System::UnitTest::Diff qw(TextEqOrDiff);
 
 my $ConfigObject = $Kernel::OM->Get('Kernel::Config');
 
@@ -143,7 +144,7 @@ my $HTMLTemplate =
 /* OTOBO is a web-based ticketing system for service organisations.
 
 Copyright (C) 2001-2020 OTRS AG, https://otrs.com/
-Copyright (C) 2019-2024 Rother OSS GmbH, https://otobo.io/
+Copyright (C) 2019-2025 Rother OSS GmbH, https://otobo.io/
 
 This program is free software: you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -192,7 +193,7 @@ for my $Test (@Tests) {
         AutoResponseType => 'auto reply/new ticket',
         UserID           => 1,
     );
-    is(
+    TextEqOrDiff(
         $AutoResponse{Text},
         $Test->{ExpectedResult},
         "$Test->{Name} AutoResponse() - Text"
diff --git a/scripts/test/sample/Loader/OTOBO.Agent.App.Login.min.js b/scripts/test/sample/Loader/OTOBO.Agent.App.Login.min.js
index 49c0a4484f..66e2c790ac 100644
--- a/scripts/test/sample/Loader/OTOBO.Agent.App.Login.min.js
+++ b/scripts/test/sample/Loader/OTOBO.Agent.App.Login.min.js
@@ -1,5 +1,5 @@
 // Copyright (C) 2001-2020 OTRS AG, https://otrs.com/
-// Copyright (C) 2019-2024 Rother OSS GmbH, https://otobo.io/
+// Copyright (C) 2019-2025 Rother OSS GmbH, https://otobo.io/
 "use strict";var OTOBO=OTOBO||{};OTOBO.Agent=OTOBO.Agent||{};OTOBO.Agent.App=OTOBO.Agent.App||{};OTOBO.Agent.App.Login=(function(TargetNS){TargetNS.Init=function(){if(!OTOBO.Debug.BrowserCheck()){$('#LoginBox').hide();$('#OldBrowser').show();return;}
 OTOBO.Form.EnableForm($('#LoginBox form, #PasswordBox form'));if($('#User').val()&&$('#User').val().length){$('#Password').focus();}
 else{$('#User').focus();}
diff --git a/scripts/test/sample/Loader/OTOBO.Reset.min.css b/scripts/test/sample/Loader/OTOBO.Reset.min.css
index 5b1a1be6b8..30d4ad39c2 100644
--- a/scripts/test/sample/Loader/OTOBO.Reset.min.css
+++ b/scripts/test/sample/Loader/OTOBO.Reset.min.css
@@ -1,7 +1,7 @@
 /* OTOBO is a web-based ticketing system for service organisations.
 
 Copyright (C) 2001-2020 OTRS AG, https://otrs.com/
-Copyright (C) 2019-2024 Rother OSS GmbH, https://otobo.io/
+Copyright (C) 2019-2025 Rother OSS GmbH, https://otobo.io/
 
 This program is free software: you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software