fix dynamic title bug

src/compile/render-dom/wrappers/Title.ts

@@ -4,6 +4,7 @@ import Block from '../Block';
 import Title from '../../nodes/Title';
 import FragmentWrapper from './Fragment';
 import { stringify } from '../../../utils/stringify';
+import addToSet from '../../../utils/addToSet';
 
 export default class TitleWrapper extends Wrapper {
 	node: Title;
@@ -32,12 +33,8 @@ export default class TitleWrapper extends Wrapper {
 			if (this.node.children.length === 1) {
 				// single {tag} — may be a non-string
 				const { expression } = this.node.children[0];
-				const { dependencies, snippet } = this.node.children[0].expression;
-
-				value = snippet;
-				dependencies.forEach(d => {
-					allDependencies.add(d);
-				});
+				value = expression.render();
+				addToSet(allDependencies, expression.dynamic_dependencies);
 			} else {
 				// '{foo} {bar}' — treat as string concatenation
 				value =

test/runtime/samples/head-title-dynamic-simple/_config.js

@@ -0,0 +1,12 @@
+export default {
+	props: {
+		foo: 'A Title'
+	},
+
+	test({ assert, component, target, window }) {
+		assert.equal(window.document.title, 'A Title');
+
+		component.foo = 'Also A Title';
+		assert.equal(window.document.title, 'Also A Title');
+	}
+};

test/runtime/samples/head-title-dynamic-simple/main.html

@@ -0,0 +1,3 @@
+<svelte:head>
+	<title>{foo}</title>
+</svelte:head>

test/store/index.js

@@ -1,7 +1,7 @@
 import * as assert from 'assert';
 import { readable, writable, derive } from '../../store.js';
 
-describe.only('store', () => {
+describe('store', () => {
 	describe('writable', () => {
 		it('creates a writable store', () => {
 			const count = writable(0);