Add value_append_empty() function

Author: adazem009

src/scratch/list_functions.cpp

@@ -17,4 +17,9 @@ extern "C"
     {
         list->removeAt(index);
     }
+
+    ValueData *list_append_empty(List *list)
+    {
+        return &list->appendEmpty();
+    }
 }

src/scratch/list_functions.h

@@ -8,11 +8,14 @@ namespace libscratchcpp
 {
 
 class List;
+struct ValueData;
 
 extern "C"
 {
     void list_clear(List *list);
     void list_remove(List *list, size_t index);
+
+    ValueData *list_append_empty(List *list);
 }
 
 } // namespace libscratchcpp

test/scratch_classes/list_functions_test.cpp

@@ -35,3 +35,20 @@ TEST(ListFunctionsTest, Remove)
     list_remove(&list, 0);
     ASSERT_TRUE(list.empty());
 }
+
+TEST(ListFunctionsTest, AppendEmpty)
+{
+    List list("", "test list");
+    list.append("Lorem");
+    list.append("ipsum");
+
+    ValueData *v = list_append_empty(&list);
+    value_init(v);
+    value_assign_double(v, 5);
+    ASSERT_EQ(list.toString(), "Lorem ipsum 5");
+
+    v = list_append_empty(&list);
+    value_init(v);
+    value_assign_string(v, "test");
+    ASSERT_EQ(list.toString(), "Lorem ipsum 5 test");
+}