diff --git a/test/test_arena.c b/test/test_arena.c
index 873671f..e7eae4c 100644
--- a/test/test_arena.c
+++ b/test/test_arena.c
@@ -108,6 +108,20 @@ static void test_arena_alloc_size_max(void **state) {
     arena_destroy(&arena);
 }
 
+static void test_arena_align_size_0(void **state) {
+    (void) state;
+
+    ArenaResult value = arena_init(64);
+    assert_true(value.is_valid);
+    Arena arena = value.arena;
+
+    ArenaPointer pointer = arena_alloc(&arena, sizeof(int), 0);
+    assert_false(pointer.is_valid);
+    assert_int_equal(pointer.err, ARENA_INVALID_ALIGN);
+
+    arena_destroy(&arena);
+}
+
 int main(void) {
     const struct CMUnitTest tests[] = {
         cmocka_unit_test(test_push_3_ints),
@@ -115,6 +129,7 @@ int main(void) {
         cmocka_unit_test(test_init_arena_0_cap),
         cmocka_unit_test(test_arena_alloc_size_0),
         cmocka_unit_test(test_arena_alloc_size_max),
+        cmocka_unit_test(test_arena_align_size_0),
     };