From edd2d47c57d4878a155cd0fbe902b980e116ec6f Mon Sep 17 00:00:00 2001
From: Rongjian Zhang <pd4d10@gmail.com>
Date: Sun, 9 May 2021 02:35:53 +0800
Subject: [PATCH] test: improve coverage of lib/fs.js

---
 test/parallel/test-fs-write-file.js        | 12 ++++++++++
 test/parallel/test-fs-writefile-with-fd.js | 26 ++++++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/test/parallel/test-fs-write-file.js b/test/parallel/test-fs-write-file.js
index 3d0fd48f05f361..98a033dce9ca00 100644
--- a/test/parallel/test-fs-write-file.js
+++ b/test/parallel/test-fs-write-file.js
@@ -95,3 +95,15 @@ fs.open(filename4, 'w+', common.mustSucceed((fd) => {
 
   process.nextTick(() => controller.abort());
 }
+
+{
+  // Test read-only mode
+  const filename = join(tmpdir.path, 'test6.txt');
+  fs.writeFileSync(filename, '');
+
+  // TODO: Correct the error type
+  fs.writeFile(filename, s, { flag: 'r' }, common.expectsError({
+    code: 'EBADF',
+    message: 'EBADF: bad file descriptor, write'
+  }));
+}
diff --git a/test/parallel/test-fs-writefile-with-fd.js b/test/parallel/test-fs-writefile-with-fd.js
index 1effc519627b50..f6137e1d26377a 100644
--- a/test/parallel/test-fs-writefile-with-fd.js
+++ b/test/parallel/test-fs-writefile-with-fd.js
@@ -55,3 +55,29 @@ tmpdir.refresh();
     }));
   }));
 }
+
+// Test read-only file descriptor
+{
+  const file = join(tmpdir.path, 'test.txt');
+  fs.open(file, 'r', common.mustSucceed((fd) => {
+    fs.writeFile(fd, 'World', common.expectsError({
+      code: 'EBADF',
+      message: 'EBADF: bad file descriptor, write'
+    }));
+  }));
+}
+
+// Test with an AbortSignal
+{
+  const controller = new AbortController();
+  const signal = controller.signal;
+  const file = join(tmpdir.path, 'test.txt');
+
+  fs.open(file, 'w', common.mustSucceed((fd) => {
+    fs.writeFile(fd, 'World', { signal }, common.expectsError({
+      name: 'AbortError'
+    }));
+  }));
+
+  controller.abort();
+}