add SSR test

test/server-side-rendering/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/server-side-rendering/samples/constructor-prefer-passed-context/_expected.html

@@ -0,0 +1 @@
+<div><div>Value in child component: undefined</div></div>

test/server-side-rendering/samples/constructor-prefer-passed-context/main.svelte

@@ -0,0 +1,10 @@
+<script>
+	import { setContext } from 'svelte';
+	import ChildComponent from './ChildComponent.svelte';
+
+	setContext('foo', true);
+
+	const content = ChildComponent.render({}, { context: new Map() }).html;
+</script>
+
+<div>{@html content}</div>