message: Use raw string literals in tests
diff: @@ -462,7 +462,7 @@ mod tests {
  let mut doc = Document::default();
  doc.add_bytes(bytes_field, "this is a test".as_bytes());
  let json_string = schema.to_json(&doc);
  - assert_eq!(json_string, "{\"my_bytes\":[\"dGhpcyBpcyBhIHRlc3Q=\"]}");
  + assert_eq!(json_string, r#"{"my_bytes":["dGhpcyBpcyBhIHRlc3Q="]}"#);
  }
  #[test]
  @@ -474,7 +474,7 @@ mod tests {
  let mut doc = Document::default();
  doc.add_bytes(bytes_field, "".as_bytes());
  let json_string = schema.to_json(&doc);
  - assert_eq!(json_string, "{\"my_bytes\":[\"\"]}");
  + assert_eq!(json_string, r#"{"my_bytes":[""]}"#);
  }
  #[test]
  @@ -491,7 +491,7 @@ mod tests {
  let json_string = schema.to_json(&doc);
  assert_eq!(
  json_string,
  - "{\"my_bytes\":[\"QSBiaWdnZXIgdGVzdCBJIGd1ZXNzCnNwYW5uaW5nIG9uIG11bHRpcGxlIGxpbmVzCmhvcGluZyB0aGlzIHdpbGwgd29yaw==\"]}"
  + r#"{"my_bytes":["QSBiaWdnZXIgdGVzdCBJIGd1ZXNzCnNwYW5uaW5nIG9uIG11bHRpcGxlIGxpbmVzCmhvcGluZyB0aGlzIHdpbGwgd29yaw=="]}"#
  );
  }
  