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test(cli): assert --max-weight error prints exactly once #183

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test(cli): assert --max-weight error prints exactly once #183

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15 changes: 11 additions & 4 deletions tests/cli.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -194,12 +194,19 @@ fn trace_diff_from_json() {
fn trace_max_weight_exceeded() {
let p = common::TestProject::new();
// Threshold of 1 byte -- guaranteed to exceed
chainsaw()
let output = chainsaw()
.args(["trace", "--max-weight", "1", "--no-cache"])
.arg(&p.entry)
.assert()
.failure()
.stderr(predicate::str::contains("exceeds --max-weight"));
.output()
.unwrap();
assert!(!output.status.success());
let stderr = String::from_utf8_lossy(&output.stderr);
// The error must appear exactly once (not duplicated by both eprintln and main handler).
let count = stderr.matches("exceeds --max-weight").count();
assert_eq!(
count, 1,
"expected error to appear exactly once, got {count}; stderr:\n{stderr}"
);
}

#[test]
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