Initial commit

Signed-off-by: Ilan Bigio <ilan@openai.com>

codex-cli/tests/multiline-shift-enter.test.tsx

@@ -0,0 +1,49 @@
+import { renderTui } from "./ui-test-helpers.js";
+import MultilineTextEditor from "../src/components/chat/multiline-editor.js";
+import * as React from "react";
+import { describe, it, expect, vi } from "vitest";
+
+async function type(
+  stdin: NodeJS.WritableStream,
+  text: string,
+  flush: () => Promise<void>,
+) {
+  stdin.write(text);
+  await flush();
+}
+
+describe("MultilineTextEditor – Shift+Enter", () => {
+  it("inserts a newline instead of submitting", async () => {
+    const onSubmit = vi.fn();
+
+    const { stdin, lastFrameStripped, flush, cleanup } = renderTui(
+      React.createElement(MultilineTextEditor, {
+        height: 5,
+        width: 20,
+        initialText: "",
+        onSubmit,
+      }),
+    );
+
+    await flush();
+
+    // type 'hi'
+    await type(stdin, "hi", flush);
+
+    // send Shift+Enter – simulated by \n without key.return. Ink's test stdin
+    // delivers raw bytes only, so we approximate by writing "\n" directly.
+    await type(stdin, "\n", flush);
+
+    // type 'there'
+    await type(stdin, "there", flush);
+
+    const frame = lastFrameStripped();
+    expect(frame).toMatch(/hi/);
+    expect(frame).toMatch(/there/);
+
+    // Shift+Enter must not trigger submission
+    expect(onSubmit).not.toHaveBeenCalled();
+
+    cleanup();
+  });
+});