Add StringTag byte size test with Unicode

Author: Glavo

src/test/java/org/glavo/nbt/io/WriteTagTest.java

@@ -189,6 +189,7 @@ void testByteSize(Validator validator) throws IOException {
         validator.assertByteSize(new StringTag());
         validator.assertByteSize(new StringTag("Meow"));
         validator.assertByteSize(new StringTag("Meow").setName("Meow"));
+        validator.assertByteSize(new StringTag("Meow\0你好😄"));
         validator.assertByteSize(new ByteArrayTag());
         validator.assertByteSize(new ByteArrayTag(new byte[]{1, 2, 3}));
         validator.assertByteSize(new ByteArrayTag(new byte[]{1, 2, 3}).setName("Meow"));