1 files changed, 63 insertions, 0 deletions
diff --git a/cli/tests/unit_node/_fs/_fs_fdatasync_test.ts b/cli/tests/unit_node/_fs/_fs_fdatasync_test.ts
new file mode 100644
index 000000000..d7ccae927
--- /dev/null
+++ b/cli/tests/unit_node/_fs/_fs_fdatasync_test.ts
@@ -0,0 +1,63 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+import {
+  assertEquals,
+  fail,
+} from "../../../../test_util/std/testing/asserts.ts";
+import { fdatasync, fdatasyncSync } from "node:fs";
+
+Deno.test({
+  name:
+    "ASYNC: flush any pending data operations 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 data = new Uint8Array(64);
+    await Deno.write(rid, data);
+
+    await new Promise<void>((resolve, reject) => {
+      fdatasync(rid, (err: Error | null) => {
+        if (err !== null) reject();
+        else resolve();
+      });
+    })
+      .then(
+        async () => {
+          assertEquals(await Deno.readFile(file), data);
+        },
+        () => {
+          fail("No error expected");
+        },
+      )
+      .finally(async () => {
+        Deno.close(rid);
+        await Deno.remove(file);
+      });
+  },
+});
+
+Deno.test({
+  name:
+    "SYNC: flush any pending data operations of the given file stream to disk.",
+  fn() {
+    const file: string = Deno.makeTempFileSync();
+    const { rid } = Deno.openSync(file, {
+      read: true,
+      write: true,
+      create: true,
+    });
+    const data = new Uint8Array(64);
+    Deno.writeSync(rid, data);
+
+    try {
+      fdatasyncSync(rid);
+      assertEquals(Deno.readFileSync(file), data);
+    } finally {
+      Deno.close(rid);
+      Deno.removeSync(file);
+    }
+  },
+});