test: peek tests done

src/arraylist.c

@@ -528,7 +528,7 @@ ArrayListErr arrayslice_peek(const ArraySlice *slice, void *out) {
         return ARRLIST_NULL_ARG;
     }
 
-    if (slice->current == slice->end) {
+    if (slice->current >= slice->end) {
         return ARRLIST_INVALID_SLICE;
     }
 
@@ -569,7 +569,7 @@ ArrayListErr arrayslice_advance(ArraySlice *slice, size_t n) {
         return ARRLIST_NULL_ARG;
     }
 
-    if (n > SIZE_MAX - slice->current || slice->current + n >= slice->end) {
+    if (n > SIZE_MAX - slice->current || slice->current + n > slice->end) {
         return ARRLIST_OUT_OF_BOUNDS;
     }