add test

test/runtime/samples/constructor-prefer-passed-context/ChildComponent.svelte

@@ -0,0 +1,6 @@
+<script>
+	import { getContext } from 'svelte';
+	const value = getContext('foo');
+</script>
+
+<div>Value in child component: {value}</div>

test/runtime/samples/constructor-prefer-passed-context/_config.js

@@ -0,0 +1,6 @@
+export default {
+	skip_if_ssr: true,
+	html: `
+		<div><div>Value in child component: undefined</div></div>
+	`
+};

test/runtime/samples/constructor-prefer-passed-context/main.svelte

@@ -0,0 +1,15 @@
+<script>
+	import { setContext } from 'svelte';
+	import ChildComponent from './ChildComponent.svelte';
+
+	setContext('foo', true);
+
+	function render(node) {
+		new ChildComponent({
+			target: node,
+			context: new Map()
+		});
+	}
+</script>
+
+<div use:render />