add workflow client with tests

src/clients/migration.rb

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+require "migration/main_workflow"
+
+::Migration::MainWorkflow.run

src/lib/migration/main_workflow.rb

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+# ------------------------------------------------------------------------------
+# Copyright (c) 2015 SUSE GmbH, 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 GmbH.
+#
+# To contact SUSE about this file by physical or electronic mail, you may find
+# current contact information at www.suse.com.
+# ------------------------------------------------------------------------------
+
+require "yast"
+
+Yast.import "Sequencer"
+
+module Migration
+  # Goal of class is to provide main single entry point to start migration
+  # work-flow. It is UI oriented sequence.
+  #
+  class MainWorkflow
+    include Yast::Logger
+
+    # array of migration steps, each step contain client and its args
+    MIGRATION_STEPS = [
+      {
+        client: "repositories",
+        args:   [:sw_single_mode]
+      }
+    ]
+    def self.run
+      workflow = new
+      workflow.run
+    end
+
+    def run
+      Yast::Sequencer.Run(aliases, WORKFLOW_SEQUENCE)
+    end
+
+    private
+
+    WORKFLOW_SEQUENCE = {
+      "ws_start"     => "repositories", # TODO: store state before run
+      "repositories" => {
+        abort: "restore",
+        next:  :next
+      },
+      "restore"      => {
+        abort: :abort
+      }
+    }
+
+    def aliases
+      {
+        "restore"      => ->() { restore_state },
+        "repositories" => -> { repositories }
+      }
+    end
+
+    def restore_state
+      # TODO: restore after canceling operation
+      raise "Restoring state is not implemented yet"
+    end
+
+    def repositories
+      Yast::WFM.CallFunction("repositories", [:sw_single_mode])
+    end
+  end
+end

test/main_workflow_test.rb

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+# ------------------------------------------------------------------------------
+# Copyright (c) 2015 SUSE GmbH, 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 GmbH.
+#
+# To contact SUSE about this file by physical or electronic mail, you may find
+# current contact information at www.suse.com.
+# ------------------------------------------------------------------------------
+
+require_relative "test_helper"
+
+require "migration/main_workflow"
+
+describe Migration::MainWorkflow do
+  describe ".run" do
+    it "pass workflow sequence to Yast sequencer" do
+      expect(Yast::Sequencer).to receive(:Run).and_return(:next)
+
+      ::Migration::MainWorkflow.run
+    end
+  end
+end