1 files changed, 36 insertions, 0 deletions
diff --git a/cli/tests/unit/sync_test.ts b/cli/tests/unit/sync_test.ts
index 7a489e951..fd6acd858 100644
--- a/cli/tests/unit/sync_test.ts
+++ b/cli/tests/unit/sync_test.ts
@@ -3,6 +3,42 @@ import { unitTest, assertEquals } from "./test_util.ts";
 
 unitTest(
   { perms: { read: true, write: true } },
+  function fdatasyncSyncSuccess(): void {
+    const filename = Deno.makeTempDirSync() + "/test_fdatasyncSync.txt";
+    const file = Deno.openSync(filename, {
+      read: true,
+      write: true,
+      create: true,
+    });
+    const data = new Uint8Array(64);
+    Deno.writeSync(file.rid, data);
+    Deno.fdatasyncSync(file.rid);
+    assertEquals(Deno.readFileSync(filename), data);
+    Deno.close(file.rid);
+    Deno.removeSync(filename);
+  }
+);
+
+unitTest(
+  { perms: { read: true, write: true } },
+  async function fdatasyncSuccess(): Promise<void> {
+    const filename = (await Deno.makeTempDir()) + "/test_fdatasync.txt";
+    const file = await Deno.open(filename, {
+      read: true,
+      write: true,
+      create: true,
+    });
+    const data = new Uint8Array(64);
+    await Deno.write(file.rid, data);
+    await Deno.fdatasync(file.rid);
+    assertEquals(await Deno.readFile(filename), data);
+    Deno.close(file.rid);
+    await Deno.remove(filename);
+  }
+);
+
+unitTest(
+  { perms: { read: true, write: true } },
   function fsyncSyncSuccess(): void {
     const filename = Deno.makeTempDirSync() + "/test_fsyncSync.txt";
     const file = Deno.openSync(filename, {