diff --git a/zig-ecs/src/ecs/groups.zig b/zig-ecs/src/ecs/groups.zig
index 25e42c3..2384c3b 100644
--- a/zig-ecs/src/ecs/groups.zig
+++ b/zig-ecs/src/ecs/groups.zig
@@ -96,3 +96,26 @@ test "BasicGroup creation" {
     reg.remove(i32, e0);
     std.debug.assert(group.len() == 0);
 }
+
+test "BasicGroup exclides" {
+    var reg = Registry.init(std.testing.allocator);
+    defer reg.deinit();
+
+    var group = reg.group(.{}, .{ i32 }, .{ u32 });
+    std.testing.expectEqual(group.len(), 0);
+
+    var e0 = reg.create();
+    reg.add(e0, @as(i32, 44));
+
+    std.debug.assert(group.len() == 1);
+
+    var iterated_entities: usize = 0;
+    var iter = group.iterator();
+    while (iter.next()) |entity| {
+        iterated_entities += 1;
+    }
+    std.testing.expectEqual(iterated_entities, 1);
+
+    reg.add(e0, @as(u32, 55));
+    std.debug.assert(group.len() == 0);
+}
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