[Init] Initial commit - NetMesh terminal manager

domain/terminalKeyboardFocus.test.ts

@@ -0,0 +1,46 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+
+import { shouldClaimTerminalKeyboardFocus } from './terminalKeyboardFocus.ts';
+
+type FakeNode = {
+  classList?: { contains: (name: string) => boolean };
+  closest: (selector: string) => FakeNode | null;
+  type?: string;
+  isContentEditable?: boolean;
+};
+
+function withClosest(
+  match: (selector: string) => boolean,
+  extras: Partial<FakeNode> = {},
+): FakeNode {
+  return {
+    closest: (selector: string) => (match(selector) ? withClosest(() => true) : null),
+    ...extras,
+  };
+}
+
+test('claims focus when nothing meaningful is focused', () => {
+  assert.equal(shouldClaimTerminalKeyboardFocus(null), true);
+});
+
+test('does not steal focus from AI side panel textarea', () => {
+  const textarea = withClosest((sel) => sel === '[data-section="ai-chat-panel"]');
+  Object.setPrototypeOf(textarea, { constructor: { name: 'HTMLTextAreaElement' } });
+  // instanceof HTMLTextAreaElement fails without DOM — exercise data-section path only.
+  assert.equal(shouldClaimTerminalKeyboardFocus(textarea as unknown as Element), false);
+});
+
+test('does not steal focus from terminal side panel shell', () => {
+  const input = withClosest((sel) => sel === '[data-section="terminal-side-panel"]');
+  assert.equal(shouldClaimTerminalKeyboardFocus(input as unknown as Element), false);
+});
+
+test('claims focus when active element is xterm helper textarea outside side panel', () => {
+  // Without DOM, HTMLTextAreaElement instanceof checks are false — so a plain
+  // element with no side-panel closest() is claimable.
+  const xterm = withClosest(() => false, {
+    classList: { contains: (name) => name === 'xterm-helper-textarea' },
+  });
+  assert.equal(shouldClaimTerminalKeyboardFocus(xterm as unknown as Element), true);
+});