add tests

Author: ranjan-purbey

packages/svelte/tests/hydration/samples/element-dir-attribute-sibling/_config.js

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+import { test } from '../../test';
+
+export default test({
+	test(assert, target) {
+		const p = target.querySelector('p');
+
+		assert.equal(p?.dir, 'rtl');
+	}
+});

packages/svelte/tests/hydration/samples/element-dir-attribute-sibling/main.svelte

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+<p dir="rtl">text</p>.

packages/svelte/tests/hydration/samples/input-checked-attribute-sibling/_config.js

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+import { test } from '../../test';
+
+export default test({
+	test(assert, target) {
+		const input = target.querySelector('input');
+
+		assert.equal(input?.checked, true);
+	}
+});

packages/svelte/tests/hydration/samples/input-checked-attribute-sibling/_expected.html

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+<!--[--><!---->.<input><!--]-->

packages/svelte/tests/hydration/samples/input-checked-attribute-sibling/main.svelte

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+.<input checked />