1 files changed, 32 insertions, 0 deletions
diff --git a/tests/unit/tty_test.ts b/tests/unit/tty_test.ts
new file mode 100644
index 000000000..f135ae7cf
--- /dev/null
+++ b/tests/unit/tty_test.ts
@@ -0,0 +1,32 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+import { assert } from "./test_util.ts";
+
+// Note tests for Deno.stdin.setRaw is in integration tests.
+
+Deno.test(function consoleSize() {
+  if (!Deno.stdout.isTerminal()) {
+    return;
+  }
+  const result = Deno.consoleSize();
+  assert(typeof result.columns !== "undefined");
+  assert(typeof result.rows !== "undefined");
+});
+
+Deno.test({ permissions: { read: true } }, function isatty() {
+  // CI not under TTY, so cannot test stdin/stdout/stderr.
+  const f = Deno.openSync("tests/testdata/assets/hello.txt");
+  assert(!Deno.isatty(f.rid));
+  f.close();
+});
+
+Deno.test(function isattyError() {
+  let caught = false;
+  try {
+    // Absurdly large rid.
+    Deno.isatty(0x7fffffff);
+  } catch (e) {
+    caught = true;
+    assert(e instanceof Deno.errors.BadResource);
+  }
+  assert(caught);
+});