Fix: Chekstyle naming convention

src/test/java/ch/unibas/dmi/dbis/cs108/casono/server/domain/user/UserFactoryTest.java

@@ -0,0 +1,67 @@
+package ch.unibas.dmi.dbis.cs108.casono.server.domain.user;
+
+import ch.unibas.dmi.dbis.cs108.casono.server.network.sessions.SessionId;
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * Tests for {@link UserFactory} and {@link UserRegistry} name assignment
+ * behavior.
+ */
+public class UserFactoryTest {
+
+    // Logger removed as per patch requirement
+
+    @Test
+    public void createUsersWithDuplicateDesiredNamesAssignsUniqueNames() {
+        UserRegistry registry = new UserRegistry();
+        UserFactory factory = new UserFactory(registry);
+
+        SessionId s1 = new SessionId();
+        SessionId s2 = new SessionId();
+        SessionId s3 = new SessionId();
+
+        // Create first user with desired name "Alice"
+        User u1 = factory.create("Alice", s1);
+        // Create second user requesting the same name
+        User u2 = factory.create("Alice", s2);
+        // Create third user requesting the same name again
+        User u3 = factory.create("Alice", s3);
+
+        assertNotNull(u1);
+        assertNotNull(u2);
+        assertNotNull(u3);
+
+        // All assigned names must be distinct
+        String n1 = u1.getName();
+        String n2 = u2.getName();
+        String n3 = u3.getName();
+
+        // assigned names: n1, n2, n3
+
+        assertNotEquals(n1, n2);
+        assertNotEquals(n1, n3);
+        assertNotEquals(n2, n3);
+
+        // Registry should contain all assigned names
+        assertTrue(registry.getByUsername(n1).isPresent());
+        assertTrue(registry.getByUsername(n2).isPresent());
+        assertTrue(registry.getByUsername(n3).isPresent());
+    }
+
+    @Test
+    public void createUserWithNullDesiredAssignsPlayerN() {
+        UserRegistry registry = new UserRegistry();
+        UserFactory factory = new UserFactory(registry);
+
+        SessionId s1 = new SessionId();
+
+        User u = factory.create(null, s1);
+        assertNotNull(u);
+        String name = u.getName();
+        // assigned anonymous name: name
+        assertTrue(name.startsWith("player"), "expected automatic name starting with 'player'");
+        assertTrue(registry.getByUsername(name).isPresent());
+    }
+}