From a46a94585003beac3f7e12cbba545574456ff7e6 Mon Sep 17 00:00:00 2001
From: George <george@me.com>
Date: Sun, 7 Jun 2026 13:33:19 +0100
Subject: [PATCH] Complete region coordinate boundary coverage

---
 .../livingworld/regions/RegionCoordinateTest.java    | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/test/java/com/livingworld/regions/RegionCoordinateTest.java b/src/test/java/com/livingworld/regions/RegionCoordinateTest.java
index 50569d9..d7044ca 100644
--- a/src/test/java/com/livingworld/regions/RegionCoordinateTest.java
+++ b/src/test/java/com/livingworld/regions/RegionCoordinateTest.java
@@ -148,6 +148,16 @@ class RegionCoordinateTest {
             assertEquals(-2, rc.x());
             assertEquals(0, rc.z());
         }
+
+        @Test
+        void negativeZBoundaryUsesFloorDivision() {
+            assertEquals(
+                    new RegionCoordinate("overworld", 0, -1),
+                    RegionCoordinate.fromBlock("overworld", 0, -128, 8));
+            assertEquals(
+                    new RegionCoordinate("overworld", 0, -2),
+                    RegionCoordinate.fromBlock("overworld", 0, -129, 8));
+        }
     }
 
     // ------------------------------------------------------------------
@@ -375,4 +385,4 @@ class RegionCoordinateTest {
             assertDoesNotThrow(() -> rc.toString());
         }
     }
-}
\ No newline at end of file
+}