From 71a4c69369ed1f63f8fe2d62a4fbc499cae735b3 Mon Sep 17 00:00:00 2001
From: usr-bin-roygbiv <roy@davai.fyi>
Date: Mon, 3 Aug 2026 12:45:43 +0000
Subject: [PATCH] test(utils): reproduce stale PATH lookup cache

---
 packages/utils/test/which.test.ts | 37 +++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 packages/utils/test/which.test.ts

diff --git a/packages/utils/test/which.test.ts b/packages/utils/test/which.test.ts
new file mode 100644
index 000000000..e054975c2
--- /dev/null
+++ b/packages/utils/test/which.test.ts
@@ -0,0 +1,37 @@
+import { afterEach, describe, expect, it } from "bun:test";
+import * as fs from "node:fs";
+import * as os from "node:os";
+import * as path from "node:path";
+import { $which } from "../src/which";
+
+describe("$which", () => {
+	const originalPath = process.env.PATH;
+	const tempDirs: string[] = [];
+
+	afterEach(() => {
+		process.env.PATH = originalPath;
+		for (const dir of tempDirs.splice(0)) {
+			fs.rmSync(dir, { recursive: true, force: true });
+		}
+	});
+
+	it.skipIf(process.platform === "win32")("uses the current process PATH for each cached lookup", () => {
+		const firstDir = fs.mkdtempSync(path.join(os.tmpdir(), "omp-which-first-"));
+		const secondDir = fs.mkdtempSync(path.join(os.tmpdir(), "omp-which-second-"));
+		tempDirs.push(firstDir, secondDir);
+
+		const command = `omp-which-${process.pid}`;
+		const firstExecutable = path.join(firstDir, command);
+		const secondExecutable = path.join(secondDir, command);
+		fs.writeFileSync(firstExecutable, "#!/bin/sh\n");
+		fs.writeFileSync(secondExecutable, "#!/bin/sh\n");
+		fs.chmodSync(firstExecutable, 0o755);
+		fs.chmodSync(secondExecutable, 0o755);
+
+		process.env.PATH = firstDir;
+		expect($which(command)).toBe(firstExecutable);
+
+		process.env.PATH = secondDir;
+		expect($which(command)).toBe(secondExecutable);
+	});
+});