diff --git a/test/helpers/icons_helper_test.rb b/test/helpers/icons_helper_test.rb
new file mode 100644
index 000000000..e8ae94c9c
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+++ b/test/helpers/icons_helper_test.rb
@@ -0,0 +1,128 @@
+# frozen_string_literal: true
+
+# Redmine - project management software
+# Copyright (C) 2006- Jean-Philippe Lang
+#
+# 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 Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+require_relative '../test_helper'
+
+class IconsHelperTest < Redmine::HelperTest
+ include IconsHelper
+
+ def test_sprite_icon_should_return_svg_with_defaults
+ expected = %r{$}
+ icon = sprite_icon('edit')
+
+ assert_match expected, icon
+ end
+
+ def test_sprite_icon_should_return_svg_with_label
+ expected = %r{Edit}
+ icon = sprite_icon('edit', 'Edit')
+
+ assert_match expected, icon
+ end
+
+ def test_sprite_icon_should_return_svg_with_hidden_label_when_icon_only_is_true
+ expected = %r{Edit}
+ icon = sprite_icon('edit', 'Edit', icon_only: true)
+
+ assert_match expected, icon
+ end
+
+ def test_sprite_icon_should_return_svg_with_custom_size
+ expected = %r{$}
+ icon = sprite_icon('edit', size: '24')
+
+ assert_match expected, icon
+ end
+
+ def test_sprite_icon_should_return_svg_with_custom_css_class
+ expected = %r{$}
+ icon = sprite_icon('edit', css_class: 'custom-class')
+
+ assert_match expected, icon
+ end
+
+ def test_sprite_icon_should_return_svg_with_custom_sprite
+ expected = %r{$}
+ icon = sprite_icon('edit', sprite: 'custom')
+
+ assert_match expected, icon
+ end
+
+ def test_sprite_icon_should_return_svg_with_plugin_sprite
+ expected = %r{$}
+ icon = sprite_icon('edit', plugin: 'my_plugin')
+
+ assert_match expected, icon
+ end
+
+ def test_file_icon_should_return_folder_icon_for_directory
+ entry = stub(:is_dir? => true)
+ expected = %r{folder_name}
+ icon = file_icon(entry, "folder_name")
+
+ assert_match expected, icon
+ end
+
+ def test_file_icon_should_return_folder_icon_for_files
+ entry = stub(:is_dir? => false)
+ expected = %r{file_name}
+ icon = file_icon(entry, "file_name")
+
+ assert_match expected, icon
+ end
+
+ def test_file_icon_should_return_file_type_icon_for_files
+ entry = stub(:is_dir? => false)
+ expected = %r{text.txt}
+ icon = file_icon(entry, "text.txt")
+
+ assert_match expected, icon
+ end
+
+ def test_principal_icon_should_return_group_icon_for_group_classes
+ expected = %r{}
+
+ %w(groupanonymous groupnonmember group).each do |principal_class|
+ assert_match expected, principal_icon(principal_class)
+ end
+ end
+
+ def test_principal_icon_should_return_nil_for_non_group_classes
+ assert_nil principal_icon('user')
+ end
+
+ def test_activity_event_type_icon_should_return_correct_icon_for_reply_events
+ expected = %r{}
+ assert_match expected, activity_event_type_icon('reply')
+ end
+
+ def test_activity_event_type_icon_should_return_correct_icon_for_time_entry_events
+ expected = %r{}
+ assert_match expected, activity_event_type_icon('time-entry')
+ end
+
+ def test_icon_for_mime_type_should_return_specific_icon_for_known_mime_types
+ assert_equal 'text-plain', icon_for_mime_type('text-plain')
+ assert_equal 'application-pdf', icon_for_mime_type('application-pdf')
+ end
+
+ def test_icon_for_mime_type_should_return_generic_file_icon_for_unknown_mime_types
+ assert_equal 'file', icon_for_mime_type('unknown-type')
+ end
+end
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