diff -r 7fd13b9f8f60 -r d315a068235a test/array_tests.c
--- a/test/array_tests.c	Sat Aug 10 11:12:49 2019 +0200
+++ b/test/array_tests.c	Tue Sep 24 20:16:00 2019 +0200
@@ -622,3 +622,26 @@
     UCX_TEST_END
     ucx_array_destroy(&array);
 }
+
+UCX_TEST(test_ucx_array_util_set) {
+    size_t capacity = 16;
+    int* array = malloc(sizeof(int)*capacity);
+
+    UCX_TEST_BEGIN
+
+    UCX_ARRAY_UTIL_SET(&array, &capacity, 7, 42);
+    
+    UCX_TEST_ASSERT(array[7] == 42, "failed");
+    UCX_TEST_ASSERT(capacity == 16, "capacity changed unnecessarily");
+    
+    UCX_ARRAY_UTIL_SET(&array, &capacity, 37, 13);
+    UCX_ARRAY_UTIL_SET(&array, &capacity, 38, 37);
+    
+    UCX_TEST_ASSERT(array[37] == 13, "failed");
+    UCX_TEST_ASSERT(array[38] == 37, "failed");
+    UCX_TEST_ASSERT(capacity == 64, "capacity not grown");
+        
+    UCX_TEST_END
+    
+    free(array);
+}