diff -r 949908c97474 -r 2be8fe3d5a2d tests/test_list.c
--- a/tests/test_list.c	Wed Jan 24 22:19:05 2024 +0100
+++ b/tests/test_list.c	Thu Jan 25 22:01:12 2024 +0100
@@ -36,6 +36,68 @@
 
 #include <stdarg.h>
 
+CX_TEST(test_array_add) {
+    int stackspace[5] = {1,1,2,3,5};
+    int *stackarray = stackspace;
+    size_t stackarray_size = 3;
+    size_t stackarray_capacity = 5;
+    int *heaparray = calloc(5, sizeof(int));
+    heaparray[0] = 2;
+    heaparray[1] = 3;
+    heaparray[2] = 5;
+    heaparray[3] = 7;
+    heaparray[4] = 11;
+    size_t heaparray_size = 3;
+    size_t heaparray_capacity = 5;
+    int elem = 8, elem2 = 47;
+    enum cx_array_copy_result result;
+    CX_TEST_DO {
+        result = cx_array_add(&stackarray, &stackarray_size, &stackarray_capacity, sizeof(int), &elem, NULL);
+        CX_TEST_ASSERT(result == CX_ARRAY_COPY_SUCCESS);
+        CX_TEST_ASSERT(stackarray[0] == 1);
+        CX_TEST_ASSERT(stackarray[1] == 1);
+        CX_TEST_ASSERT(stackarray[2] == 2);
+        CX_TEST_ASSERT(stackarray[3] == 8);
+        CX_TEST_ASSERT(stackarray[4] == 5);
+        CX_TEST_ASSERT(stackarray_size == 4);
+        CX_TEST_ASSERT(stackarray_capacity == 5);
+
+        stackarray_size = 5;
+        result = cx_array_add(&stackarray, &stackarray_size, &stackarray_capacity, sizeof(int), &elem2, NULL);
+        CX_TEST_ASSERT(result == CX_ARRAY_COPY_REALLOC_NOT_SUPPORTED);
+        CX_TEST_ASSERT(stackarray[0] == 1);
+        CX_TEST_ASSERT(stackarray[1] == 1);
+        CX_TEST_ASSERT(stackarray[2] == 2);
+        CX_TEST_ASSERT(stackarray[3] == 8);
+        CX_TEST_ASSERT(stackarray[4] == 5);
+        CX_TEST_ASSERT(stackarray_size == 5);
+        CX_TEST_ASSERT(stackarray_capacity == 5);
+
+        result = cx_array_add(&heaparray, &heaparray_size, &heaparray_capacity, sizeof(int), &elem, cx_array_default_reallocator);
+        CX_TEST_ASSERT(result == CX_ARRAY_COPY_SUCCESS);
+        CX_TEST_ASSERT(heaparray[0] == 2);
+        CX_TEST_ASSERT(heaparray[1] == 3);
+        CX_TEST_ASSERT(heaparray[2] == 5);
+        CX_TEST_ASSERT(heaparray[3] == 8);
+        CX_TEST_ASSERT(heaparray[4] == 11);
+        CX_TEST_ASSERT(heaparray_size == 4);
+        CX_TEST_ASSERT(heaparray_capacity == 5);
+
+        heaparray_size = 5;
+        result = cx_array_add(&heaparray, &heaparray_size, &heaparray_capacity, sizeof(int), &elem2, cx_array_default_reallocator);
+        CX_TEST_ASSERT(result == CX_ARRAY_COPY_SUCCESS);
+        CX_TEST_ASSERT(heaparray[0] == 2);
+        CX_TEST_ASSERT(heaparray[1] == 3);
+        CX_TEST_ASSERT(heaparray[2] == 5);
+        CX_TEST_ASSERT(heaparray[3] == 8);
+        CX_TEST_ASSERT(heaparray[4] == 11);
+        CX_TEST_ASSERT(heaparray[5] == 47);
+        CX_TEST_ASSERT(heaparray_size == 6);
+        CX_TEST_ASSERT(heaparray_capacity >= 6);
+    }
+    free(heaparray);
+}
+
 typedef struct node {
     struct node *next;
     struct node *prev;
@@ -1344,6 +1406,8 @@
 CxTestSuite *cx_test_suite_array_list(void) {
     CxTestSuite *suite = cx_test_suite_new("array_list");
 
+    cx_test_register(suite, test_array_add);
+
     cx_test_register(suite, test_list_arl_create);
     cx_test_register(suite, test_list_arl_create_simple);
     cx_test_register(suite, test_list_arl_create_simple_for_pointers);