fix: make parsing error test data return parse error

This was not the case anymore with pallas '0.25.0'.

Author: jpraynaud

mithril-common/src/cardano_transaction_parser.rs

@@ -326,7 +326,7 @@ mod tests {
             cardano_transaction_parser
                 .parse(db_path, &beacon)
                 .await
-                .unwrap();
+                .expect_err("parse should have failed");
         }
 
         let log_file = std::fs::read_to_string(&filepath).unwrap();

mithril-test-lab/test_data/README.md

@@ -7,5 +7,5 @@
 > [!NOTE]
 > The immutable files (`.chunk`, `.primary` and `.secondary`) files are data that are the result of
 > the `mithril-end-to-end` test command execution.
-> The `parsing_error/` directory contains the `04831` and `04832` immutable files with some unparsable blocks in the first one (`04831` have been produced by the Sanchonet network, and `04832` created manually).
+> The `parsing_error/` directory contains the `04831` and `04832` immutable files with some unparsable blocks in the first one (`04831` have been produced by the Sanchonet network and altered manually with the command `echo " $(cat immutable/04831.chunk)" > immutable/04831.chunk`, and `04832` created manually).
 > They are needed for testing of the Cardano transactions parser.