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//! Integration tests for the TypeScript mutation rule (#202).
//!
//! These run REAL Stryker over the fixture projects via the SDK
//! ([`mutation::measure_typescript`]) and assert the surviving-mutant set — the TS
//! parallel of the Rust vertical (#201). Per the #3 guardrail the *projects
//! themselves* are the fixtures: `killed` (every mutant caught by an asserting test)
//! reports no survivors, and `survivors` (an assertion-light test that runs the code
//! but pins nothing) reports several — the gap mutation testing exposes that coverage
//! can't.
//!
//! Each test runs against its own staged copy of the fixture (node_modules symlinked to
//! the shared toolchain) so Stryker's in-project report/sandbox never collides between
//! the parallel tests. Requires the fixtures' Stryker toolchain (`npm ci` in
//! `tests/fixtures/unit_mutation/typescript`).
mod common;
use common::Staged;
use testing_conventions::mutation::measure_typescript;
#[test]
fn killed_reports_no_survivors() {
let project = Staged::new("killed");
let survivors = measure_typescript(
project.path(),
&[],
&std::collections::BTreeMap::new(),
None,
)
.expect("stryker runs");
assert!(
survivors.is_empty(),
"every mutant should be caught; got {survivors:?}"
);
}
#[test]
fn survivors_are_reported() {
let project = Staged::new("survivors");
let survivors = measure_typescript(
project.path(),
&[],
&std::collections::BTreeMap::new(),
None,
)
.expect("stryker runs");
assert!(
!survivors.is_empty(),
"the assertion-light suite should leave survivors"
);
assert!(
survivors.iter().all(|m| m.file == "index.ts"),
"every survivor is in index.ts; got {survivors:?}"
);
}
#[test]
fn a_mutation_exemption_drops_the_survivors() {
// Exempting the survivors' file lifts all of them — an equivalent / deliberately
// defensive mutation, waived with a reason via `[[typescript.exempt]] rules = ["mutation"]`.
let project = Staged::new("survivors");
let exempt = vec!["index.ts".to_string()];
let survivors = measure_typescript(
project.path(),
&exempt,
&std::collections::BTreeMap::new(),
None,
)
.expect("stryker runs");
assert!(
survivors.is_empty(),
"the exemption should drop every survivor; got {survivors:?}"
);
}