core: handle btree test cases where two nodes have the same value

core-test/core-units.c

@@ -66,6 +66,7 @@ void test_btree_iterate(CuTest *tc)
 
 	b_btree tree = {0};
 	struct test_tree_node *nodes = calloc(nr_nodes, sizeof *nodes);
+	CuAssertPtrNotNull(tc, nodes);
 
 	for (int i = 0; i < nr_nodes; i++) {
 		nodes[i].value = rand();
@@ -84,7 +85,7 @@ void test_btree_iterate(CuTest *tc)
 			continue;
 		}
 
-		CuAssertTrue(tc, prev < node->value);
+		CuAssertTrue(tc, prev <= node->value);
 		prev = node->value;
 	}