test: add known_issues test for fs.copyFile()

On macOS, fs.copyFile() may not respect file permissions. There is a PR
for libuv that should fix this, but until it lands and we can either
float a patch or upgrade libuv, have a known_issues test.

Ref: nodejs#26936
Ref: libuv/libuv#2233

test/known_issues/known_issues.status

@@ -7,18 +7,24 @@ prefix known_issues
 [true] # This section applies to all platforms
 
 [$system==win32]
+test-fs-copyfile-respect-permissions: SKIP
 
 [$system==linux]
 test-vm-timeout-escape-promise: PASS,FLAKY
+test-fs-copyfile-respect-permissions: SKIP
 
 [$system==macos]
 
 [$system==solaris]
+test-fs-copyfile-respect-permissions: SKIP
 
 [$system==freebsd]
+test-fs-copyfile-respect-permissions: SKIP
 
 [$system==aix]
+test-fs-copyfile-respect-permissions: SKIP
 
 [$arch==arm]
 # https://github.com/nodejs/node/issues/24120
 test-vm-timeout-escape-nexttick: PASS,FLAKY
+test-fs-copyfile-respect-permissions: SKIP

test/known_issues/test-fs-copyfile-respect-permissions.js

@@ -0,0 +1,25 @@
+'use strict';
+
+// Test that fs.copyFile() respects file permissions.
+// Ref: https://github.com/nodejs/node/issues/26936
+
+require('../common');
+
+const tmpdir = require('../common/tmpdir');
+tmpdir.refresh();
+
+const assert = require('assert');
+const fs = require('fs');
+const path = require('path');
+
+const source = path.join(tmpdir.path, 'source');
+const dest = path.join(tmpdir.path, 'dest');
+
+fs.writeFileSync(source, 'source');
+fs.writeFileSync(dest, 'dest');
+fs.chmodSync(dest, '444');
+
+fs.copyFile(source, dest, (err) => {
+  assert.strictEqual(err.code, 'EACCESS');
+  assert.strictEqual(fs.readFileSync(dest, 'utf8'), 'dest');
+});