message: [core] Use `0x0` rather than 0 for byte blob
diff: @@ -133,9 +133,9 @@ impl Default for TestEnvData {
  fn default() -> Self {
  Self {
  storage: HashMap::new(),
  - caller: srml::Address([0; 32]),
  + caller: srml::Address([0x0; 32]),
  input: Vec::new(),
  - random_seed: srml::Hash([0; 32]),
  + random_seed: srml::Hash([0x0; 32]),
  expected_return: Vec::new(),
  total_reads: Cell::new(0),
  total_writes: 0,
  