BloomTestRenderer class

Test harness wrapping a BloomNode AST tree for querying and assertion in VM tests.

Enables testing of Bloom components in standard dart test environments on the Dart VM without requiring a browser DOM, JS runtime, or Flutter engine.

Provides querying utilities (queryBy* and getBy*) that traverse the descriptor hierarchy, inspect attributes and text content, and support snapshot verification via toHtml.

BloomNode counterComponent(Signal<int> count) => Div(
  attrs: {'data-testid': 'counter-root'},
  children: [
    Live(() => Span(attrs: {'data-testid': 'count-val'}, text: 'Count: ${count.value}')),
    Button(
      attrs: {'data-testid': 'inc-btn'},
      onClick: (_) => count.value++,
      text: 'Increment',
    ),
  ],
);

void main() {
  test('increments counter on click', () {
    final count = signal(0);
    final renderer = renderForTest(counterComponent(count));

    expect(renderer.getByTestId('count-val').text, 'Count: 0');

    final btn = renderer.getByTestId('inc-btn');
    fireEvent.click(btn);

    expect(count.value, 1);
  });
}