feat: storing multiple properties for a set

Author: nergal-perm

src/main/java/ru/ewc/spv/core/Storage.java

@@ -34,7 +34,7 @@ public class Storage {
     public void add(StoredValue specification) {
         this.specifications.add(
             new StoredValue(
-                String.valueOf(++nextSetId),
+                specification.set() == null ? String.valueOf(++nextSetId) : specification.set(),
                 specification.property(),
                 specification.value()
             )
@@ -49,4 +49,10 @@ public StoredValue get(String set) {
             .orElse(null);
         return storedValue;
     }
+
+    public List<StoredValue> getAsList(String set) {
+        return this.specifications.stream()
+            .filter(specification -> set.equals(specification.set()))
+            .toList();
+    }
 }

src/test/java/ru/ewc/spv/core/StorageTest.java

@@ -31,10 +31,7 @@
 public class StorageTest {
     @Test
     void shouldGetSetsWithSingleProperties() {
-        final Storage actual = storageWith(
-            new StoredValue(null, "Property", "Value"),
-            new StoredValue(null, "NewProp", "NewValue")
-        );
+        final Storage actual = defaultStorage();
         MatcherAssert.assertThat(
             "The storage property for the first set should be fetched",
             actual.get("1"),
@@ -47,6 +44,28 @@ void shouldGetSetsWithSingleProperties() {
         );
     }
 
+    @Test
+    void shouldGetSetWithMultipleProperties() {
+        final Storage actual = defaultStorage();
+        MatcherAssert.assertThat(
+            "Should fetch all properties of a set",
+            actual.getAsList("3"),
+            Matchers.hasItems(
+                new StoredValue("3", "Property", "ValueTheThird"),
+                new StoredValue("3", "AnotherProp", "AnotherValue")
+            )
+        );
+    }
+
+    private static Storage defaultStorage() {
+        return storageWith(
+            new StoredValue(null, "Property", "Value"),
+            new StoredValue(null, "NewProp", "NewValue"),
+            new StoredValue(null, "Property", "ValueTheThird"),
+            new StoredValue("3", "AnotherProp", "AnotherValue")
+        );
+    }
+
     private static Storage storageWith(StoredValue... specifications) {
         final Storage target = new Storage();
         for (StoredValue specification : specifications) {