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tests.costOf

Runs interaction once the app has settled, settles what it started, and returns what it cost the main thread in counts (docs/testing.md#cost-budgets): (await costOf(() => press(like))).toStayWithin({ layoutPasses: 0 }).

function

Usage

Add an interaction budget

tsx
import { Pressable, Text, signal } from 'kuito';
import { costOf, press, render, screen, test } from 'kuito/tests';

function Like() {
  const liked = signal(false);
  return (
    <Pressable onPress={() => (liked.value = !liked.value)} opacity={liked.value ? 1 : 0.6}>
      <Text>Like</Text>
    </Pressable>
  );
}

test('a like lays nothing out', async () => {
  await render(<Like />);

  const cost = await costOf(() => press(screen.getByText('Like')));

  cost.toStayWithin({ layoutPasses: 0, measureCalls: 0, viewsCreated: 0 });
});

Signatures

ts
(interaction: () => unknown): Promise<Cost>

Parameters

NameTypeRequiredDescription
interaction() => unknownYes—

Returns

Promise<Cost>

Generated from the public TypeScript declarations: signatures, props and defaults come from the checked source, descriptions from its JSDoc. No defaults are invented.