From 6c3c9e9ee4020b5bf3b6fa470d859e3e0b24be6d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Juan=20Jos=C3=A9=20Arboleda?= <soyjuanarbol@gmail.com>
Date: Tue, 11 Oct 2022 02:42:01 -0500
Subject: [PATCH] test: improve test coverage for `os` package

---
 test/parallel/test-os-process-priority.js | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/test/parallel/test-os-process-priority.js b/test/parallel/test-os-process-priority.js
index c6fdbff9e554d9..ed8cb3475c33ef 100644
--- a/test/parallel/test-os-process-priority.js
+++ b/test/parallel/test-os-process-priority.js
@@ -109,6 +109,16 @@ for (let i = PRIORITY_HIGHEST; i <= PRIORITY_LOW; i++) {
   checkPriority(process.pid, i);
 }
 
+{
+  // From libuv docs
+  // "The priority value range is between -20 (high priority) and 19 (low priority)"
+  assert.throws(() => { os.getPriority(-21); }, {
+    code: 'ERR_SYSTEM_ERROR',
+    message: 'A system error occurred: uv_os_getpriority returned ESRCH (no such process)',
+    name: 'SystemError'
+  });
+}
+
 
 function checkPriority(pid, expected) {
   const priority = os.getPriority(pid);