fix dvd path that crash if do not contain path (bnc#938786)

src/modules/SourceDialogs.rb

@@ -2266,8 +2266,11 @@ def SelectStore(key, event)
           @_url = "smb://"
         elsif selected == :nfs
           @_url = "nfs://"
+        # this case is specific, as it return complete path and not just
+        # prefix as others
         elsif selected == :cd || selected == :dvd
-          @_url = selected == :cd ? "cd://" : "dvd://"
+          # use three slashes as third slash means path
+          @_url = selected == :cd ? "cd:///" : "dvd:///"
           if @cd_device_name != ""
             @_url = Ops.add(
               Ops.add(@_url, "?devices="),

test/source_dialogs_test.rb

@@ -80,4 +80,15 @@
       expect(subject.URLScheme("test")).to eq "url"
     end
   end
+
+  describe ".SelectStore" do
+    it "sets url to full url for DVD and CD selection" do
+      allow(Yast::UI).to receive(:QueryWidget).with(Id(:type), :CurrentButton)
+        .and_return(:dvd)
+
+      described_class.SelectStore(:type, {})
+
+      expect(described_class.instance_variable_get("@_url")).to eq "dvd:///"
+    end
+  end
 end

test/test_helper.rb

@@ -8,3 +8,4 @@
 end
 
 require "yast"
+require "yast/rspec"