1 files changed, 61 insertions, 0 deletions
diff --git a/cli/tests/unit_node/_fs/_fs_fsync_test.ts b/cli/tests/unit_node/_fs/_fs_fsync_test.ts
new file mode 100644
index 000000000..586c7d7e6
--- /dev/null
+++ b/cli/tests/unit_node/_fs/_fs_fsync_test.ts
@@ -0,0 +1,61 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+import {
+  assertEquals,
+  fail,
+} from "../../../../test_util/std/testing/asserts.ts";
+import { fsync, fsyncSync } from "node:fs";
+
+Deno.test({
+  name: "ASYNC: flush any pending data of the given file stream to disk",
+  async fn() {
+    const file: string = await Deno.makeTempFile();
+    const { rid } = await Deno.open(file, {
+      read: true,
+      write: true,
+      create: true,
+    });
+    const size = 64;
+    await Deno.ftruncate(rid, size);
+
+    await new Promise<void>((resolve, reject) => {
+      fsync(rid, (err: Error | null) => {
+        if (err !== null) reject();
+        else resolve();
+      });
+    })
+      .then(
+        async () => {
+          assertEquals((await Deno.stat(file)).size, size);
+        },
+        () => {
+          fail("No error expected");
+        },
+      )
+      .finally(async () => {
+        await Deno.remove(file);
+        Deno.close(rid);
+      });
+  },
+});
+
+Deno.test({
+  name: "SYNC: flush any pending data the given file stream to disk",
+  fn() {
+    const file: string = Deno.makeTempFileSync();
+    const { rid } = Deno.openSync(file, {
+      read: true,
+      write: true,
+      create: true,
+    });
+    const size = 64;
+    Deno.ftruncateSync(rid, size);
+
+    try {
+      fsyncSync(rid);
+      assertEquals(Deno.statSync(file).size, size);
+    } finally {
+      Deno.removeSync(file);
+      Deno.close(rid);
+    }
+  },
+});