1 files changed, 69 insertions, 0 deletions
diff --git a/tests/unit/sync_test.ts b/tests/unit/sync_test.ts
new file mode 100644
index 000000000..40a8054c0
--- /dev/null
+++ b/tests/unit/sync_test.ts
@@ -0,0 +1,69 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+import { assertEquals } from "./test_util.ts";
+
+Deno.test(
+  { permissions: { read: true, write: true } },
+  function fdatasyncSyncSuccess() {
+    const filename = Deno.makeTempDirSync() + "/test_fdatasyncSync.txt";
+    using file = Deno.openSync(filename, {
+      read: true,
+      write: true,
+      create: true,
+    });
+    const data = new Uint8Array(64);
+    Deno.writeSync(file.rid, data);
+    Deno.fdatasyncSync(file.rid);
+    Deno.removeSync(filename);
+  },
+);
+
+Deno.test(
+  { permissions: { read: true, write: true } },
+  async function fdatasyncSuccess() {
+    const filename = (await Deno.makeTempDir()) + "/test_fdatasync.txt";
+    using file = await Deno.open(filename, {
+      read: true,
+      write: true,
+      create: true,
+    });
+    const data = new Uint8Array(64);
+    await file.write(data);
+    await Deno.fdatasync(file.rid);
+    assertEquals(await Deno.readFile(filename), data);
+    await Deno.remove(filename);
+  },
+);
+
+Deno.test(
+  { permissions: { read: true, write: true } },
+  function fsyncSyncSuccess() {
+    const filename = Deno.makeTempDirSync() + "/test_fsyncSync.txt";
+    using file = Deno.openSync(filename, {
+      read: true,
+      write: true,
+      create: true,
+    });
+    const size = 64;
+    file.truncateSync(size);
+    Deno.fsyncSync(file.rid);
+    assertEquals(Deno.statSync(filename).size, size);
+    Deno.removeSync(filename);
+  },
+);
+
+Deno.test(
+  { permissions: { read: true, write: true } },
+  async function fsyncSuccess() {
+    const filename = (await Deno.makeTempDir()) + "/test_fsync.txt";
+    using file = await Deno.open(filename, {
+      read: true,
+      write: true,
+      create: true,
+    });
+    const size = 64;
+    await file.truncate(size);
+    await Deno.fsync(file.rid);
+    assertEquals((await Deno.stat(filename)).size, size);
+    await Deno.remove(filename);
+  },
+);