feat(items): reindex returns sanitized furnidata delta

Emulator/src/test/java/com/eu/habbo/habbohotel/items/FurnitureTextProviderDeltaTest.java

@@ -0,0 +1,40 @@
+package com.eu.habbo.habbohotel.items;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class FurnitureTextProviderDeltaTest {
+
+    @Test
+    void firstReindexReturnsAllAsDelta() {
+        FurnitureTextProvider p = new FurnitureTextProvider(true);
+        List<FurnidataEntry> delta = p.reindex(List.of(
+            new FurnidataEntry(1, "chair", FurnitureType.FLOOR, "Chair", "Sit")));
+        assertEquals(1, delta.size());
+        assertEquals("Chair", delta.get(0).name());
+    }
+
+    @Test
+    void unchangedReindexReturnsEmptyDelta() {
+        FurnitureTextProvider p = new FurnitureTextProvider(true);
+        List<FurnidataEntry> first = List.of(new FurnidataEntry(1, "chair", FurnitureType.FLOOR, "Chair", "Sit"));
+        p.reindex(first);
+        List<FurnidataEntry> delta = p.reindex(first);
+        assertTrue(delta.isEmpty(), "no change => empty delta");
+    }
+
+    @Test
+    void changedNameAppearsInDeltaWithSanitizedValue() {
+        FurnitureTextProvider p = new FurnitureTextProvider(true);
+        p.reindex(List.of(new FurnidataEntry(1, "chair", FurnitureType.FLOOR, "Chair", "Sit")));
+        List<FurnidataEntry> delta = p.reindex(List.of(
+            new FurnidataEntry(1, "chair", FurnitureType.FLOOR, "New %x%", "Sit")));
+        assertEquals(1, delta.size());
+        assertFalse(delta.get(0).name().contains("%"), "delta carries the sanitized name");
+        assertEquals(1, delta.get(0).id());
+        assertEquals(FurnitureType.FLOOR, delta.get(0).type());
+    }
+}