Added tests for validating enemy sprite ranges

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

packages/wolf_3d_dart/test/entities/enemy_validation_test.dart

@@ -0,0 +1,56 @@
+import 'dart:math' as math;
+
+import 'package:test/test.dart';
+import 'package:wolf_3d_dart/src/entities/entities/enemies/enemy_type.dart';
+
+void main() {
+  group('Enemy Sprite Range Validation', () {
+    test('No enemy animations should have overlapping sprite indices', () {
+      final allEnemies = EnemyType.values;
+      final overlaps = <String>[];
+
+      for (int i = 0; i < allEnemies.length; i++) {
+        final enemyA = allEnemies[i];
+        final animationsA = enemyA.animations.allRanges;
+
+        for (int j = i; j < allEnemies.length; j++) {
+          final enemyB = allEnemies[j];
+          final animationsB = enemyB.animations.allRanges;
+
+          animationsA.forEach((animA, rangeA) {
+            animationsB.forEach((animB, rangeB) {
+              // Skip if we are comparing the exact same animation on the same enemy
+              if (enemyA == enemyB && animA == animB) return;
+
+              if (rangeA.overlaps(rangeB)) {
+                // Determine the specific frames that are clashing
+                final start = math.max(rangeA.start, rangeB.start);
+                final end = math.min(rangeA.end, rangeB.end);
+                final clashingFrames = <int>[];
+
+                for (int f = start; f <= end; f++) {
+                  if (rangeA.contains(f) && rangeB.contains(f)) {
+                    clashingFrames.add(f);
+                  }
+                }
+
+                if (clashingFrames.isNotEmpty) {
+                  overlaps.add(
+                    '${enemyA.name}.${animA.name} overlaps ${enemyB.name}.${animB.name} on frames: $clashingFrames',
+                  );
+                }
+              }
+            });
+          });
+        }
+      }
+
+      // Assert that the list of overlaps is empty
+      expect(
+        overlaps,
+        isEmpty,
+        reason: 'Detected sprite index collisions:\n${overlaps.join('\n')}',
+      );
+    });
+  });
+}