types: fix array unshift operations and add test coverage

 - Fix `ucv_array_unshift()` improperly rejecting operation on empty arrays
 - Fix `uc_unshift()` improperly reversing maintaining argument order
 - Add missing test coverage for `push()`, `pop()`, `unshift()` and
   `shift()` array operations.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/types.c b/types.c
index cde2221..321392e 100644
--- a/types.c
+++ b/types.c
@@ -772,7 +772,7 @@ ucv_array_unshift(uc_value_t *uv, uc_value_t *item)
 	uc_array_t *array = (uc_array_t *)uv;
 	size_t i;
 
-	if (ucv_type(uv) != UC_ARRAY || array->count == 0)
+	if (ucv_type(uv) != UC_ARRAY)
 		return NULL;
 
 	array->count++;