message: Adding to docs that test chainspecs three block eras.
diff: @@ -21,6 +21,7 @@ lazy_static! {
  }
  /// Loads the local chainspec and overrides timestamp and genesis account with the given stakes.
  +/// The test `Chainspec` returned has eras with exactly three blocks.
  pub fn new_test_chainspec(stakes: Vec<(PublicKey, u64)>) -> Chainspec {
  let mut chainspec = Chainspec::from_resources("test/valid/chainspec.toml");
  chainspec.genesis.accounts = stakes
  