diff --git a/testsuite/features/reposync/srv_sync_repo_sync.feature b/testsuite/features/reposync/srv_sync_repo_sync.feature
new file mode 100644
index 000000000000..3edae5612be9
--- /dev/null
+++ b/testsuite/features/reposync/srv_sync_repo_sync.feature
@@ -0,0 +1,55 @@
+# Copyright (c) 2023 SUSE LLC
+# Licensed under the terms of the MIT license.
+
+Feature: Strict Mode for Channel Synchronization
+  In order to control strict mode synchronization
+  As an admin user
+  I want to be able to toggle strict mode synchronization via the UI and command line
+
+Scenario: Create Test-strict-channel
+  Given I am authorized for the "Admin" section
+    And I prepare a channel clone for strict mode testing
+    And I follow the left menu "Software > Manage > Channels"
+    And I follow "Create Channel"
+    And I enter "Test-Strict-Channel" as "Channel Name"
+    And I enter "test-strict-channel" as "Channel Label"
+    And I enter "Test-Strict-Channel for testing" as "Channel Summary"
+    And I click on "Create Channel"
+    Then I should see a "Channel Test-Strict-Channel created." text
+
+Scenario: Prepare repos for strict test
+    Given I am authorized for the "Admin" section
+    And I follow the left menu "Software > Manage > Repositories"
+    And I follow "Create Repository"
+    And I enter "fake-rpm-repo-modified" as "label"
+    And I enter "http://localhost/pub/TestRepoRpmUpdates_STRICT_TEST/" as "url"
+    And I uncheck "metadataSigned"
+    And I click on "Create Repository"
+    Then I should see a "Repository created successfully" text
+
+@rrichardson-test
+Scenario: Testing strict mode
+    Given I am authorized for the "Admin" section
+    And I follow the left menu "Software > Manage > Channels"
+    And I follow "Test-Strict-Channel"
+    And I follow "Repositories" in the "content area"
+    And I check "fake-rpm-repo" in the list
+    And I click on "Save Repositories"
+    And I follow "Sync" in the "content area"
+    And I click on "Sync Now"	
+    And I wait at most 60 seconds until I do not see "Repository sync is running." text, refreshing the page
+    And I check the amount of packages in channel "test-strict-channel"
+    And I follow "Add / Remove"
+    And I uncheck "fake-rpm-repo" in the list
+    And I check "fake-rpm-repo-modified" in the list
+    And I click on "Save Repositories"
+    And I follow "Sync" in the "content area"
+    And I check "no-strict"
+    And I click on "Sync Now"	
+    And I wait at most 60 seconds until I do not see "Repository sync is running." text, refreshing the page
+    Then The amount of packages in channel "Test-Strict-Channel" should be the same as before
+    
+    And I uncheck "no-strict"
+    And I click on "Sync Now"	
+    And I wait at most 60 seconds until I do not see "Repository sync is running." text, refreshing the page
+    Then The amount of packages in channel "Test-Strict-Channel" should be fewer than before
diff --git a/testsuite/features/step_definitions/command_steps.rb b/testsuite/features/step_definitions/command_steps.rb
index e48240def98b..0491bf0f72ec 100644
--- a/testsuite/features/step_definitions/command_steps.rb
+++ b/testsuite/features/step_definitions/command_steps.rb
@@ -117,6 +117,49 @@
 end
 
 # Channels
+When(/^I prepare a channel clone for strict mode testing$/) do
+  get_target('server').run('cp -r /srv/www/htdocs/pub/TestRepoRpmUpdates /srv/www/htdocs/pub/TestRepoRpmUpdates_STRICT_TEST')
+  get_target('server').run('rm -rf /srv/www/htdocs/pub/TestRepoRpmUpdates_STRICT_TEST/repodata')
+  %w[i586 src x86_64].each do |folder|
+    get_target('server').run("rm -f /srv/www/htdocs/pub/TestRepoRpmUpdates_STRICT_TEST/#{folder}/rute-dummy-2.0-1.2.*.rpm")
+  end
+  get_target('server').run('createrepo_c /srv/www/htdocs/pub/TestRepoRpmUpdates_STRICT_TEST')
+  get_target('server').run('gzip -dc /srv/www/htdocs/pub/TestRepoRpmUpdates/repodata/*-updateinfo.xml.gz > /tmp/updateinfo.xml')
+  get_target('server').run('modifyrepo_c --verbose --mdtype updateinfo /tmp/updateinfo.xml /srv/www/htdocs/pub/TestRepoRpmUpdates_STRICT_TEST/repodata')
+end
+
+Given(/^I am logged into the API$/) do
+  server_node = get_target('server')
+  api_url = "https://#{server_node.public_ip}/rhn/manager/api/auth/login"
+  response = get_target('server').run("curl -H 'Content-Type: application/json' -d '{'login': 'admin', 'password': 'admin'}' -i #{api_url}")
+  raise 'Failed to login to the API' unless response.code == 200
+end
+
+$package_amount = nil
+
+When(/^I check the amount of packages in channel "([^"]*)"$/) do |channel_label|
+  channels = $api_test.channel.list_all_channels
+  if channels.key?(channel_label)
+    package_amount = channels[channel_label]['packages']
+    puts "Package amount for 'test-strict': #{package_amount}"
+  else
+    puts "#{channel_label} channel not found."
+  end
+end
+
+Then(/^The amount of packages in channel "([^"]*)" should be the same as before$/) do |channel_label|
+  channels = $api_test.channel.list_all_channels
+  if channels.key?(channel_label) && ($package_amount != channels[channel_label]['packages'])
+    raise 'Package counts do not match'
+  end
+end
+
+Then(/^The amount of packages in channel "([^"]*)" should be fewer than before$/) do |channel_label|
+  channels = $api_test.channel.list_all_channels
+  if channels.key?(channel_label) && channels[channel_label]['packages'] >= $package_amount
+    raise 'Package count is not fewer than before'
+  end
+end
 
 When(/^I delete these channels with spacewalk-remove-channel:$/) do |table|
   channels_cmd = 'spacewalk-remove-channel '
diff --git a/testsuite/features/step_definitions/navigation_steps.rb b/testsuite/features/step_definitions/navigation_steps.rb
index 504575bff9e8..687b22ef319a 100644
--- a/testsuite/features/step_definitions/navigation_steps.rb
+++ b/testsuite/features/step_definitions/navigation_steps.rb
@@ -941,6 +941,14 @@
   row.set(true)
 end
 
+When(/^I uncheck "([^"]*)" in the list$/) do |text|
+  top_level_xpath_query = "//div[@class=\"table-responsive\"]/table/tbody/tr[.//td[contains(.,'#{text}')]]//input[@type='checkbox']"
+  row = find(:xpath, top_level_xpath_query, match: :first)
+  raise "xpath: #{top_level_xpath_query} not found" if row.nil?
+
+  row.set(false)
+end
+
 #
 # Test if an option is selected
 #
diff --git a/testsuite/features/support/namespaces/channel.rb b/testsuite/features/support/namespaces/channel.rb
index 47ce0cc589d9..eb9ee822ad5a 100644
--- a/testsuite/features/support/namespaces/channel.rb
+++ b/testsuite/features/support/namespaces/channel.rb
@@ -33,6 +33,26 @@ def verify_channel(label)
          .include?(label)
   end
 
+  def list_all_channels
+    channels = @test.call('channel.listAllChannels', sessionKey: @test.token)
+
+    mapped_channels =
+      channels.map do |channel|
+        [
+          channel['label'],
+          {
+            'id' => channel['id'],
+            'name' => channel['name'],
+            'provider_name' => channel['provider_name'],
+            'packages' => channel['packages'],
+            'systems' => channel['systems'],
+            'arch_name' => channel['arch_name']
+          }
+        ]
+      end
+    mapped_channels.to_h
+  end
+
   def list_software_channels
     channels = @test.call('channel.listSoftwareChannels', sessionKey: @test.token)
     channels.map { |channel| channel['label'] }
diff --git a/testsuite/run_sets/github_validation/github_validation_core.yml b/testsuite/run_sets/github_validation/github_validation_core.yml
index 3dc0be5f7a24..72a170c42d49 100644
--- a/testsuite/run_sets/github_validation/github_validation_core.yml
+++ b/testsuite/run_sets/github_validation/github_validation_core.yml
@@ -10,6 +10,7 @@
 - features/reposync/srv_create_fake_repositories.feature
 - features/reposync/srv_sync_fake_channels.feature
 - features/reposync/srv_create_activationkey.feature
+- features/reposync/srv_sync_repo_sync.feature
 - features/core/srv_osimage.feature
 - features/core/srv_docker.feature
 ## Container features END ###