1 files changed, 16 insertions, 0 deletions
diff --git a/cli/js/tests/umask_test.ts b/cli/js/tests/umask_test.ts
new file mode 100644
index 000000000..543372a46
--- /dev/null
+++ b/cli/js/tests/umask_test.ts
@@ -0,0 +1,16 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+import { unitTest, assertEquals } from "./test_util.ts";
+
+unitTest(
+  {
+    skip: Deno.build.os === "win"
+  },
+  function umaskSuccess(): void {
+    const prevMask = Deno.umask(0o020);
+    const newMask = Deno.umask(prevMask);
+    const finalMask = Deno.umask();
+    assertEquals(newMask, 0o020);
+    assertEquals(finalMask, prevMask);
+    assertEquals(prevMask, 0o022);
+  }
+);