1 files changed, 18 insertions, 0 deletions
diff --git a/cli/tests/raw_mode.ts b/cli/tests/raw_mode.ts
new file mode 100644
index 000000000..125601b2b
--- /dev/null
+++ b/cli/tests/raw_mode.ts
@@ -0,0 +1,18 @@
+Deno.setRaw(0, true);
+Deno.setRaw(0, true); // Can be called multiple times
+
+Deno.stdout.writeSync(new TextEncoder().encode("S"));
+
+const buf = new Uint8Array(3);
+for (let i = 0; i < 3; i++) {
+  const nread = await Deno.stdin.read(buf);
+  if (nread === Deno.EOF) {
+    break;
+  } else {
+    const data = new TextDecoder().decode(buf.subarray(0, nread));
+    Deno.stdout.writeSync(new TextEncoder().encode(data.toUpperCase()));
+  }
+}
+
+Deno.setRaw(0, false); // restores old mode.
+Deno.setRaw(0, false); // Can be safely called multiple times