| 1 | //! Intentional-regression guardrails for Sprint 27. |
| 2 | |
| 3 | mod common; |
| 4 | |
| 5 | use std::path::PathBuf; |
| 6 | |
| 7 | use common::harness::{ |
| 8 | diff_macho, have_xcrun, have_xcrun_tool, link_both, load_corpus, output_section, |
| 9 | }; |
| 10 | |
| 11 | #[test] |
| 12 | fn mutated_text_byte_is_not_tolerated() { |
| 13 | if !have_xcrun() || !have_xcrun_tool("ld") { |
| 14 | eprintln!("skipping: xcrun as/ld unavailable"); |
| 15 | return; |
| 16 | } |
| 17 | |
| 18 | let root = PathBuf::from(env!("CARGO_MANIFEST_DIR")) |
| 19 | .join("tests") |
| 20 | .join("parity_corpus"); |
| 21 | let case = load_corpus(&root) |
| 22 | .expect("load parity corpus") |
| 23 | .into_iter() |
| 24 | .find(|case| case.name == "hello_classic") |
| 25 | .expect("hello_classic parity case"); |
| 26 | |
| 27 | let outputs = link_both(&case).expect("link hello_classic with both linkers"); |
| 28 | let (_, mut our_text) = |
| 29 | output_section(&outputs.ours, "__TEXT", "__text").expect("afs-ld __TEXT,__text"); |
| 30 | let (_, their_text) = |
| 31 | output_section(&outputs.theirs, "__TEXT", "__text").expect("Apple __TEXT,__text"); |
| 32 | |
| 33 | our_text[0] ^= 0x1; |
| 34 | let report = diff_macho(&our_text, &their_text); |
| 35 | assert!( |
| 36 | !report.is_clean(), |
| 37 | "mutated text byte should be reported as critical: {report:#?}" |
| 38 | ); |
| 39 | assert!( |
| 40 | !report.critical.is_empty(), |
| 41 | "expected at least one critical diff after mutation: {report:#?}" |
| 42 | ); |
| 43 | } |
| 44 |