feat: configure SUMA product tree base URL

Allow user to configure the SUMA product tree base URL in RMT's config
file `mirroring.suma_product_tree_base_url` attribute. The configured
value takes precedence over the default (https://scc.suse.com/suma/).

lib/rmt/mirror/suma_product_tree.rb

@@ -3,9 +3,9 @@ class RMT::Mirror::SumaProductTree
 
   attr_reader :mirroring_base_dir, :url, :logger
 
-  def initialize(logger:, mirroring_base_dir:, url: FILE_URL)
+  def initialize(logger:, mirroring_base_dir:, url: nil)
     @mirroring_base_dir = mirroring_base_dir
-    @url = url
+    @url = url || Settings.try(:mirroring).try(:suma_product_tree_base_url) || FILE_URL
     @logger = logger
   end
 

spec/lib/rmt/mirror/suma_product_tree_spec.rb

@@ -12,7 +12,7 @@
   let(:ref_configuration) do
     {
       relative_path: 'product_tree.json',
-      base_url: described_class::FILE_URL,
+      base_url: base_url,
       cache_dir: nil,
       base_dir: File.join(base_dir, '/suma/')
     }
@@ -21,11 +21,7 @@
   let(:base_dir) { '/tmp' }
   let(:downloader) { instance_double RMT::Downloader }
 
-  describe '#mirror' do
-    before do
-      allow(RMT::Downloader).to receive(:new).and_return downloader
-    end
-
+  shared_examples 'mirror SUMA product tree' do
     it 'mirrors the product_tree file' do
       expect(RMT::Mirror::FileReference).to receive(:new).with(**ref_configuration)
       expect(downloader).to receive(:download_multi)
@@ -48,4 +44,34 @@
       end
     end
   end
+
+  describe '#mirror' do
+    before do
+      allow(RMT::Downloader).to receive(:new).and_return downloader
+    end
+
+    context 'with default SUMA product tree URL' do
+      before do
+        allow(Settings).to receive(:try).with(:mirroring).and_return(nil)
+      end
+
+      it_behaves_like 'mirror SUMA product tree' do
+        let(:base_url) { 'https://scc.suse.com/suma/' }
+      end
+    end
+
+    context 'with custom SUMA product tree URL' do
+      before do
+        allow(Settings).to receive(:try).with(:mirroring).and_return(mirroring_configuration)
+        allow(mirroring_configuration).to receive(:try)
+          .with(:suma_product_tree_base_url).and_return(base_url)
+      end
+
+      let(:mirroring_configuration) { instance_double(Config::Options) }
+
+      it_behaves_like 'mirror SUMA product tree' do
+        let(:base_url) { 'http://localhost:3000/suma/' }
+      end
+    end
+  end
 end