Fix `rand` in container tests

tests/core/container/test_core_avl.odin

@@ -21,14 +21,15 @@ test_avl :: proc(t: ^testing.T) {
 	testing.expect(t, avl.iterator_get(&iter) == nil, "empty/iterator: first node should be nil")
 
 	r: rand.Rand
-	rand.init(&r, t.seed)
+	r := rand.create(t.seed)
+	context.random_generator = rand.default_random_generator(&r)
 
 	// Test insertion.
 	NR_INSERTS :: 32 + 1 // Ensure at least 1 collision.
 	inserted_map := make(map[int]^avl.Node(int))
 	defer delete(inserted_map)
 	for i := 0; i < NR_INSERTS; i += 1 {
-		v := int(rand.uint32(&r) & 0x1f)
+		v := int(rand.uint32() & 0x1f)
 		existing_node, in_map := inserted_map[v]
 
 		n, ok, _ := avl.find_or_insert(&tree, v)
@@ -78,7 +79,7 @@ test_avl :: proc(t: ^testing.T) {
 	testing.expect(t, visited == nrEntries, "iterator/backward: visited")
 
 	// Test removal.
-	rand.shuffle(inserted_values[:], &r)
+	rand.shuffle(inserted_values[:])
 	for v, i in inserted_values {
 		node := avl.find(&tree, v)
 		testing.expect(t, node != nil, "remove: find (pre)")

tests/core/container/test_core_rbtree.odin

@@ -15,7 +15,8 @@ test_rbtree_integer :: proc(t: ^testing.T, $Key: typeid, $Value: typeid) {
 	context.allocator = mem.tracking_allocator(&track)
 
 	r: rand.Rand
-	rand.init(&r, t.seed)
+	r := rand.create(t.seed)
+	context.random_generator = rand.default_random_generator(&r)
 
 	log.infof("Testing Red-Black Tree($Key=%v,$Value=%v) using random seed %v.", type_info_of(Key), type_info_of(Value), t.seed)
 	tree: rb.Tree(Key, Value)
@@ -35,9 +36,9 @@ test_rbtree_integer :: proc(t: ^testing.T, $Key: typeid, $Value: typeid) {
 	max_key := min(Key)
 
 	for i := 0; i < NR_INSERTS; i += 1 {
-		k := Key(rand.uint32(&r)) & 0x1f
+		k := Key(rand.uint32()) & 0x1f
 		min_key = min(min_key, k); max_key = max(max_key, k)
-		v := Value(rand.uint32(&r))
+		v := Value(rand.uint32())
 
 		existing_node, in_map := inserted_map[k]
 		n, inserted, _ := rb.find_or_insert(&tree, k, v)
@@ -92,7 +93,7 @@ test_rbtree_integer :: proc(t: ^testing.T, $Key: typeid, $Value: typeid) {
 	testing.expect(t, visited == entry_count, "iterator/backward: visited")
 
 	// Test removal (and on_remove callback)
-	rand.shuffle(inserted_keys[:], &r)
+	rand.shuffle(inserted_keys[:])
 	callback_count := entry_count
 	tree.user_data = &callback_count
 	tree.on_remove = proc(key: Key, value: Value, user_data: rawptr) {