Only create Versions DF when needed

spec/app/finders/theme_version_spec.rb

@@ -13,20 +13,21 @@ describe WPScan::Finders::ThemeVersion::Base do
       expect(theme_version.finders.map { |f| f.class.to_s.demodulize }).to eql @expected
     end
 
-    context 'when no related specific finders' do
+    context 'when no related dynamic finders' do
       it 'contains the default finders' do
         @expected = default_finders
       end
     end
 
-    context 'when specific finders' do
-      {
-      }.each do |theme_slug, specific_finders|
+    # Dynamic Version Finders are not tested here, they are in
+    # spec/lib/finders/dynamic_finder/theme_versions_spec
+    context 'when dynamic finders' do
+      WPScan::DB::DynamicFinders::Theme.versions_finders_configs.each do |theme_slug, configs|
         context "when #{theme_slug} theme" do
           let(:slug) { theme_slug }
 
-          it 'contains the expected finders' do
-            @expected = default_finders + specific_finders
+          it 'contains the expected finders (default + the dynamic ones)' do
+            @expected = default_finders + configs.keys
           end
         end
       end