1 files changed, 15 insertions, 0 deletions
diff --git a/tests/unit/umask_test.ts b/tests/unit/umask_test.ts
new file mode 100644
index 000000000..0e97f0d35
--- /dev/null
+++ b/tests/unit/umask_test.ts
@@ -0,0 +1,15 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+import { assertEquals } from "./test_util.ts";
+
+Deno.test(
+  {
+    ignore: Deno.build.os === "windows",
+  },
+  function umaskSuccess() {
+    const prevMask = Deno.umask(0o020);
+    const newMask = Deno.umask(prevMask);
+    const finalMask = Deno.umask();
+    assertEquals(newMask, 0o020);
+    assertEquals(finalMask, prevMask);
+  },
+);