test: add flag scenario in test-fs-write-file-sync

fs.writeFileSync takes flag param to define the file opening semantics. Add a scenario that covers flags as well. PR-URL: #24766 Reviewed-By: Richard Lau <riclau@uk.ibm.com> Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
nodejs · Dec 5, 2018 · 95720089d54fe5d11d4b7a9094cac1518cf3bec7 · 9572008
1 parent 7c70b61
commit 95720089d54fe5d11d4b7a9094cac1518cf3bec7
Showing with 9 additions and 0 deletions.

+9 −0 test/parallel/test-fs-write-file-sync.js
diff --git a/test/parallel/test-fs-write-file-sync.js b/test/parallel/test-fs-write-file-sync.js
@@ -96,3 +96,12 @@ function closeSync() {
   openCount--;
   return fs._closeSync.apply(fs, arguments);
 }
+
+// Test writeFileSync with flags
+const file4 = path.join(tmpdir.path, 'testWriteFileSyncFlags.txt');
+
+fs.writeFileSync(file4, 'hello ', { encoding: 'utf8', flag: 'a' });
+fs.writeFileSync(file4, 'world!', { encoding: 'utf8', flag: 'a' });
+
+content = fs.readFileSync(file4, { encoding: 'utf8' });
+assert.strictEqual(content, 'hello world!');