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..23f8f5ceb796
--- /dev/null
+++ b/testsuite/features/reposync/srv_sync_repo_sync.feature
@@ -0,0 +1,56 @@
+# Copyright (c) 2023 SUSE LLC
+# Licensed under the terms of the MIT license.
+
+@susemanager
+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
+
+@susemanager
+Scenario: Run synchronization with default strict mode
+  Given I am authorized for the "Admin" section
+    And I prepare a channel clone for strict mode testing
+    And I am on the Channels page
+    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
+    
+    And I follow "Repositories" in the content area
+    And I follow "Create Repository"
+    And I enter "TestRepo_Default" as "Repository Label"
+    And I enter "http://localhost/pub/TestRepoRpmUpdates/" as "Repository URL"
+    And I follow "Create Repository"
+    Then I should see a "Repository created successfully" text
+    
+    And I follow "Create Repository"
+    And I enter "TestRepo_Modified" as "Repository Label"
+    And I enter "http://localhost/pub/TestRepoRpmUpdates_STRICT_TEST/" as "Repository URL"
+    And I uncheck "Has Signed Metadata"
+    And I follow "Create Repository"
+    Then I should see a "Repository created successfully" text
+    
+    And I check "TestRepo_Default"
+    And I follow "Save Repositories"
+    And I follow "Sync"
+    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 "TestRepo_Default"
+    And I check "TestRepo_Modified"
+    And I follow "Save Repositories"
+    And I follow "Sync"
+    And I check "Do not use strict mode"
+    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 am logged into the API
+    Then The amount of packages in channel "Test-Strict-Channel" should be the same as before
+    
+    And I uncheck "Do not use strict mode"
+    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 fewer than before
\ No newline at end of file
diff --git a/testsuite/features/step_definitions/command_steps.rb b/testsuite/features/step_definitions/command_steps.rb
index a0dceddc9e70..994055bd8a4b 100644
--- a/testsuite/features/step_definitions/command_steps.rb
+++ b/testsuite/features/step_definitions/command_steps.rb
@@ -117,6 +117,55 @@
 end
 
 # Channels
+When(/^i prepare a channel clone for strict mode testing$/) do
+  get_target('server').run('cp -r /srv/www/htdocs/pub/TestRepoRpmUpdates /srv/www/htdocs/pub/TestRepoRpmUpdates_STRICT_TEST')
+  get_target('server').run('rm -rf /srv/www/htdocs/pub/TestRepoRpmUpdates_STRICT_TEST/repodata')
+  %w[i586 src x86_64].each do |folder|
+    get_target('server').run("rm -f /srv/www/htdocs/pub/TestRepoRpmUpdates_STRICT_TEST/#{folder}/rute-dummy-2.0-1.2.*.rpm")
+  end
+  get_target('server').run('createrepo_c /srv/www/htdocs/pub/TestRepoRpmUpdates_STRICT_TEST')
+  get_target('server').run('gzip -dc /srv/www/htdocs/pub/TestRepoRpmUpdates/repodata/*-updateinfo.xml.gz > /tmp/updateinfo.xml')
+  get_target('server').run('modifyrepo_c --verbose --mdtype updateinfo /tmp/updateinfo.xml /srv/www/htdocs/pub/TestRepoRpmUpdates_STRICT_TEST/repodata')
+end
+
+$api_token = nil # TODO: Move elsewhere
+
+Given(/^I am logged into the API$/) do # TODO: Move elsewhere
+  api_url = "https://localhost/rhn/manager/api/auth/login"
+  response = RestClient.post(api_url, { login: "admin", password: "admin" }.to_json, { content_type: :json })
+  raise "Failed to login to the API" unless response.code == 200
+  
+  $api_token = response.cookies["pxt-session-cookie"]
+end
+
+$previous_packages_count = nil
+
+When(/^i check the amount of packages in channel "([^"]*)"$/) do |channel_label|
+  api_url = "https://localhost/rhn/manager/api/listAllChannels"
+  response = RestClient.get(api_url, { content_type: :json, cookie: "pxt-session-cookie=#{$api_token}" })
+  channels = JSON.parse(response.body)["result"]
+  channel = channels.find { |c| c["label"] == channel_label }
+  raise "Channel not found" unless channel
+  $previous_packages_count = channel["packages"]
+end
+
+Then(/^The amount of packages in channel "([^"]*)" should be the same as before$/) do |channel_label|
+  api_url = "https://localhost/rhn/manager/api/listAllChannels"
+  response = RestClient.get(api_url, { content_type: :json, cookie: "pxt-session-cookie=#{$api_token}" })
+  channels = JSON.parse(response.body)["result"]
+  channel = channels.find { |c| c["label"] == channel_label }
+  raise "Channel not found" unless channel
+  raise "Package counts do not match" unless $previous_packages_count == channel["packages"]
+end
+
+Then(/^The amount of packages in channel "([^"]*)" should be fewer than before$/) do |channel_label|
+  api_url = "https://localhost/rhn/manager/api/listAllChannels"
+  response = RestClient.get(api_url, { content_type: :json, cookie: "pxt-session-cookie=#{$api_token}" })
+  channels = JSON.parse(response.body)["result"]
+  channel = channels.find { |c| c["label"] == channel_label }
+  raise "Channel not found" unless channel
+  raise "Package count is not fewer than before" unless channel["packages"] < $previous_packages_count
+end
 
 When(/^I delete these channels with spacewalk-remove-channel:$/) do |table|
   channels_cmd = 'spacewalk-remove-channel '