add tests

packages/svelte/tests/runtime-runes/samples/svg-namespace-if-block/Child.svelte

@@ -0,0 +1,8 @@
+
+{#if true}
+	<g>
+		<rect x="20" y="10" width="50" height="50" fill="yellow"/>
+	</g>
+{:else}
+	<div>lol</div>
+{/if}

packages/svelte/tests/runtime-runes/samples/svg-namespace-if-block/_config.js

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+import { test, ok } from '../../test';
+
+export default test({
+	html: `<svg height="200px" viewBox="0 0 100 100" width="200px"><g><rect fill="yellow" height="50" width="50" x="20" y="10"></rect></g></svg>`,
+	test({ assert, target }) {
+		const g = target.querySelector('g');
+		const rect = target.querySelector('rect');
+		ok(g);
+		ok(rect);
+
+		assert.equal(g.namespaceURI, 'http://www.w3.org/2000/svg');
+		assert.equal(rect.namespaceURI, 'http://www.w3.org/2000/svg');
+	}
+});

packages/svelte/tests/runtime-runes/samples/svg-namespace-if-block/main.svelte

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+<script>
+	import Child from "./Child.svelte";
+</script>
+
+<svg viewBox="0 0 100 100" width="200px" height="200px">
+	<Child />
+</svg>