From e78764caa16af8581f99855ee297d682e14f3600 Mon Sep 17 00:00:00 2001
From: Tamara Dahlgren <35777542+tldahlgren@users.noreply.github.com>
Date: Wed, 21 Oct 2020 17:32:04 -0700
Subject: Added _poll_lock exception tests (#19446)

---
 lib/spack/spack/test/llnl/util/lock.py | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'lib')

diff --git a/lib/spack/spack/test/llnl/util/lock.py b/lib/spack/spack/test/llnl/util/lock.py
index 99c1eba588..596a801179 100644
--- a/lib/spack/spack/test/llnl/util/lock.py
+++ b/lib/spack/spack/test/llnl/util/lock.py
@@ -43,6 +43,8 @@ actually on a shared filesystem.
 
 """
 import collections
+import errno
+import fcntl
 import os
 import socket
 import shutil
@@ -1277,6 +1279,30 @@ def test_downgrade_write_fails(tmpdir):
             lock.downgrade_write_to_read()
 
 
+@pytest.mark.parametrize("err_num,err_msg",
+                         [(errno.EACCES, "Fake EACCES error"),
+                          (errno.EAGAIN, "Fake EAGAIN error"),
+                          (errno.ENOENT, "Fake ENOENT error")])
+def test_poll_lock_exception(tmpdir, monkeypatch, err_num, err_msg):
+    """Test poll lock exception handling."""
+    def _lockf(fd, cmd, len, start, whence):
+        raise IOError(err_num, err_msg)
+
+    with tmpdir.as_cwd():
+        lockfile = 'lockfile'
+        lock = lk.Lock(lockfile)
+
+        touch(lockfile)
+
+        monkeypatch.setattr(fcntl, 'lockf', _lockf)
+
+        if err_num in [errno.EAGAIN, errno.EACCES]:
+            assert not lock._poll_lock(fcntl.LOCK_EX)
+        else:
+            with pytest.raises(IOError, match=err_msg):
+                lock._poll_lock(fcntl.LOCK_EX)
+
+
 def test_upgrade_read_okay(tmpdir):
     """Test the lock read-to-write upgrade operation."""
     with tmpdir.as_cwd():
-- 
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