1 files changed, 41 insertions, 0 deletions
diff --git a/vendor/xshell/tests/compile_time.rs b/vendor/xshell/tests/compile_time.rs
new file mode 100644
index 000000000..ca35eefe8
--- /dev/null
+++ b/vendor/xshell/tests/compile_time.rs
@@ -0,0 +1,41 @@
+use std::time::{Duration, Instant};
+
+use xshell::{cmd, Shell};
+
+#[test]
+fn fixed_cost_compile_times() {
+    let sh = Shell::new().unwrap();
+
+    let _p = sh.push_dir("tests/data");
+    let baseline = compile_bench(&sh, "baseline");
+    let _ducted = compile_bench(&sh, "ducted");
+    let xshelled = compile_bench(&sh, "xshelled");
+    let ratio = (xshelled.as_millis() as f64) / (baseline.as_millis() as f64);
+    assert!(1.0 < ratio && ratio < 10.0);
+
+    fn compile_bench(sh: &Shell, name: &str) -> Duration {
+        let _p = sh.push_dir(name);
+        let cargo_build = cmd!(sh, "cargo build -q");
+        cargo_build.read().unwrap();
+
+        let n = 5;
+        let mut times = Vec::new();
+        for _ in 0..n {
+            sh.remove_path("./target").unwrap();
+            let start = Instant::now();
+            cargo_build.read().unwrap();
+            let elapsed = start.elapsed();
+            times.push(elapsed);
+        }
+
+        times.sort();
+        times.remove(0);
+        times.pop();
+        let total = times.iter().sum::<Duration>();
+        let average = total / (times.len() as u32);
+
+        eprintln!("compiling {name}: {average:?}");
+
+        total
+    }
+}