Add spec

spec/public/versions_spec.rb

@@ -78,4 +78,31 @@
       end
     end
   end
+
+  describe '#in_range' do
+    let(:versions) do
+      [
+        ResourceRegistry::Versions::Version.new('2024-01-01'),
+        ResourceRegistry::Versions::Version.new('2024-04-28'),
+        ResourceRegistry::Versions::Version.new('2024-09-20'),
+        ResourceRegistry::Versions::Version.new('2025-01-09')
+      ]
+    end
+
+    it 'filtered the version by >= from & <= to' do
+      expect(subject.in_range('2024-04-28', '2024-09-20')).count.to eq(2)
+    end
+
+    context 'without to' do
+      it 'filtered the version by >= from' do
+        expect(subject.in_range('2024-04-28', nil)).count.to eq(3)
+      end
+    end
+
+    context 'without from' do
+      it 'filtered the version by <= to' do
+        expect(subject.in_range(nil, '2024-09-20')).count.to eq(3)
+      end
+    end
+  end
 end