message: [examples/lang] Add simple off-chain test to the incrementer example
diff: @@ -41,3 +41,18 @@ contract! {
  }
  }
  }
  +
  +#[cfg(test)]
  +mod tests {
  + use super::Incrementer;
  +
  + #[test]
  + fn it_works() {
  + let mut incrementer = Incrementer::deploy_mock(5);
  + assert_eq!(incrementer.get(), 5);
  + incrementer.inc(42);
  + assert_eq!(incrementer.get(), 47);
  + incrementer.inc(0);
  + assert_eq!(incrementer.get(), 47);
  + }
  +}
  