TESTING: add simple client to ease test

src/clients/test_addon_selection.rb

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+require "registration/clients/test_addon_selection"
+Yast::TestAddonSelectionClient.new.main

src/lib/registration/clients/test_addon_selection.rb

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+# Copyright (c) [2019] SUSE LLC
+#
+# All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of version 2 of the GNU General Public License as published
+# by the Free Software Foundation.
+#
+# 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, contact SUSE LLC.
+#
+# To contact SUSE LLC about this file by physical or electronic mail, you may
+# find current contact information at www.suse.com.
+
+require "suse/connect"
+require "registration/ui/addon_selection_registration_dialog"
+
+class RegistrationMock
+  def activated_products
+    YAML.load_file("test/fixtures/activated_products.yml")
+  end
+
+  def get_addon_list
+    YAML.load_file("test/fixtures/pure_addons.yml")
+  end
+
+  def addon_generator(params = {})
+    SUSE::Connect::Remote::Product.new(suse_connect_product_generator(params))
+  end
+end
+
+module Yast
+  class Registration::Addon
+    def self.find_all(registration)
+      YAML.load_file("test/fixtures/sle15_addons.yaml")
+    end
+  end
+
+  class TestAddonSelectionClient < Client
+    def main
+      Yast.import "Mode"
+      Yast.import "Stage"
+      Yast.import "Wizard"
+
+
+      Stage.Set("continue")
+      Mode.SetMode("installation")
+
+      Wizard.CreateDialog
+
+      registration = RegistrationMock.new
+      Registration::UI::AddonSelectionRegistrationDialog.run(registration)
+
+      Wizard.CloseDialog
+
+      true
+    end
+  end
+end