Add AutoinstSize#unlimited?

src/lib/y2storage/proposal/autoinst_devices_planner.rb

@@ -371,7 +371,7 @@ def assign_size_to_partition(disk, partition, part_section)
 
         partition.min_size = size_info.min
         partition.max_size = size_info.max
-        partition.weight = 1 if size_info.max == DiskSize.unlimited
+        partition.weight = 1 if size_info.unlimited?
         true
       end
 
@@ -395,7 +395,7 @@ def assign_size_to_lv(vg, lv, lv_section)
           lv.min_size = size_info.min
           lv.max_size = size_info.max
         end
-        lv.weight = 1 if size_info.max == DiskSize.unlimited
+        lv.weight = 1 if size_info.unlimited?
 
         true
       end

src/lib/y2storage/proposal/autoinst_size.rb

@@ -42,6 +42,13 @@ def initialize(value, min: nil, max: nil, weight: nil, percentage: nil)
         @weight = weight
         @percentage = percentage
       end
+
+      # Determines whether the size is unlimited
+      #
+      # @return [Boolean] +true+ if unlimited; +false+ otherwise.
+      def unlimited?
+        !!max && max.unlimited?
+      end
     end
   end
 end

test/y2storage/proposal/autoinst_size_test.rb

@@ -0,0 +1,55 @@
+#!/usr/bin/env rspec
+# encoding: utf-8
+
+# Copyright (c) [2017] 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_relative "../spec_helper"
+require "y2storage/proposal/autoinst_size"
+
+describe Y2Storage::Proposal::AutoinstSize do
+
+  subject(:autoinst_size) { described_class.new("10GB", max: max) }
+
+  describe "#unlimited?" do
+    context "when max size is unlimited" do
+      let(:max) { Y2Storage::DiskSize.unlimited }
+
+      it "returns true" do
+        expect(autoinst_size).to be_unlimited
+      end
+    end
+
+    context "when max size is nil" do
+      let(:max) { nil }
+
+      it "returns false" do
+        expect(autoinst_size).to_not be_unlimited
+      end
+    end
+
+    context "when max size is not unlimited" do
+      let(:max) { Y2Storage::DiskSize.GiB(10) }
+
+      it "returns false" do
+        expect(autoinst_size).to_not be_unlimited
+      end
+    end
+  end
+end