message: Breaking up long string with escaped newlines
diff: @@ -129,10 +129,15 @@ fn send_a_wire_unit_with_too_small_a_round_exp() {
  "Invalid message is not message that was sent."
  );
  assert_eq!(offending_sender, &sender, "Unexpected sender.");
  - assert!(format!("{:?}", err).starts_with(
  - "The vertex contains an invalid unit: `The round length exponent is less than the minimum allowed by the chain-spec.`"),
  + assert!(
  + format!("{:?}", err).starts_with(
  + "The vertex contains an invalid unit: `The round \
  + length exponent is less than the minimum allowed by \
  + the chain-spec.`"
  + ),
  "Error message did not start as expected: {:?}",
  - err)
  + err
  + )
  }
  Some(protocol_outcome) => panic!("Unexpected protocol outcome {:?}", protocol_outcome),
  }
  