fs: throw errors from fs.ftruncateSync in JS

PR-URL: https://github.com/nodejs/node/pull/18348
Refs: https://github.com/nodejs/node/issues/18106
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/test/parallel/test-fs-error-messages.js b/test/parallel/test-fs-error-messages.js
index ef38652d7a..b7e7ab6a2c 100644
--- a/test/parallel/test-fs-error-messages.js
+++ b/test/parallel/test-fs-error-messages.js
@@ -455,3 +455,30 @@ function re(literals, ...values) {
     validateError
   );
 }
+
+// ftruncate
+{
+  const validateError = (err) => {
+    assert.strictEqual(err.syscall, 'ftruncate');
+    // Could be EBADF or EINVAL, depending on the platform
+    if (err.code === 'EBADF') {
+      assert.strictEqual(err.message, 'EBADF: bad file descriptor, ftruncate');
+      assert.strictEqual(err.errno, uv.UV_EBADF);
+    } else {
+      assert.strictEqual(err.message, 'EINVAL: invalid argument, ftruncate');
+      assert.strictEqual(err.errno, uv.UV_EINVAL);
+      assert.strictEqual(err.code, 'EINVAL');
+    }
+    return true;
+  };
+
+  const fd = fs.openSync(existingFile, 'r');
+  fs.closeSync(fd);
+
+  fs.ftruncate(fd, 4, common.mustCall(validateError));
+
+  assert.throws(
+    () => fs.ftruncateSync(fd, 4),
+    validateError
+  );
+}