1 files changed, 22 insertions, 0 deletions
diff --git a/cli/js/tty_test.ts b/cli/js/tty_test.ts
new file mode 100644
index 000000000..f58784a7c
--- /dev/null
+++ b/cli/js/tty_test.ts
@@ -0,0 +1,22 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+import { test, testPerm, assert } from "./test_util.ts";
+
+// Note tests for Deno.setRaw is in integration tests.
+
+testPerm({ read: true }, function isatty(): void {
+  // CI not under TTY, so cannot test stdin/stdout/stderr.
+  const f = Deno.openSync("cli/tests/hello.txt");
+  assert(!Deno.isatty(f.rid));
+});
+
+test(function isattyError(): void {
+  let caught = false;
+  try {
+    // Absurdly large rid.
+    Deno.isatty(0x7fffffff);
+  } catch (e) {
+    caught = true;
+    assert(e instanceof Deno.errors.BadResource);
+  }
+  assert(caught);
+});