implement this.redirect in preload (#83)

test/app/routes/_components/Nav.html

@@ -3,6 +3,7 @@
 		<li><a href='/'>home</a></li>
 		<li><a href='/about'>about</a></li>
 		<li><a href='/slow-preload'>slow preload</a></li>
+		<li><a href='/redirect-from'>redirect</a></li>
 		<li><a rel=prefetch class='{{page === "blog"  ? "selected" : ""}}' href='/blog'>blog</a></li>
 	</ul>
 </nav>

test/app/routes/redirect-from.html

@@ -0,0 +1,7 @@
+<script>
+	export default {
+		preload() {
+			this.redirect(301, '/redirect-to');
+		}
+	};
+</script>

test/app/routes/redirect-to.html

@@ -0,0 +1 @@
+<h1>redirected</h1>

test/common/test.js

@@ -297,6 +297,33 @@ function run(env) {
 						assert.ok(matches);
 					});
 			});
+
+			it('redirects on server', () => {
+				return nightmare.goto(`${base}/redirect-from`)
+					.path()
+					.then(path => {
+						assert.equal(path, '/redirect-to');
+					})
+					.then(() => nightmare.page.title())
+					.then(title => {
+						assert.equal(title, 'redirected');
+					});
+			});
+
+			it('redirects on client', () => {
+				return nightmare.goto(base)
+					.wait('[href="/redirect-from"]')
+					.click('[href="/redirect-from"]')
+					.wait(200)
+					.path()
+					.then(path => {
+						assert.equal(path, '/redirect-to');
+					})
+					.then(() => nightmare.page.title())
+					.then(title => {
+						assert.equal(title, 'redirected');
+					});
+			});
 		});
 
 		describe('headers', () => {