Assert that tree exists, fix tests (#358)

* assert that tree exists, fix tests

* make assertions more helpful

tests/browser/freeze.js

@@ -16,6 +16,7 @@ test('freeze (default)', function (t) {
     t.equal(state.foo, 'bar', 'cannot modify property')
     state.bar = 'baz'
     t.equal(state.bar, undefined, 'cannot add property')
+    return document.createElement('div')
   }])
 
   app.start()
@@ -36,6 +37,7 @@ test('noFreeze', function (t) {
     t.equal(state.foo, '', 'can modify property')
     state.bar = 'baz'
     t.equal(state.bar, 'baz', 'can add property')
+    return document.createElement('div')
   }])
 
   app.start()

tests/browser/rehydration.js

@@ -12,7 +12,7 @@ test('rehydration', function (t) {
 
   const node = html`
     <section id="app-root">
-      <div id="app-root">Hello squirrel!</span>
+      <div>Hello squirrel!</span>
     </section>
   `
 

tests/browser/routing.js

@@ -125,6 +125,7 @@ test('routing', function (t) {
     app.router('/', [
       ['/', function () {
         t.pass('rendered')
+        return document.createElement('div')
       }]
     ])
 
@@ -139,7 +140,10 @@ test('routing', function (t) {
     })
 
     const app = choo({ href: false })
-    app.router(['/', () => t.pass('rendered')])
+    app.router(['/', function () {
+      t.pass('rendered')
+      return document.createElement('div')
+    }])
     app.start()
   })
 
@@ -152,30 +156,14 @@ test('routing', function (t) {
     app.router({ default: '/users/123' }, [
       ['/users', [
         ['/:user', function (state) {
-          t.deepEqual(state.params, {user: '123'})
+          t.deepEqual(state.location.params, {user: '123'})
+          return document.createElement('div')
         }]
       ]]
     ])
 
     app.start()
   })
-
-  t.test('prev.params always exists', function (t) {
-    t.plan(1)
-
-    const choo = require('../..')
-    const app = choo()
-
-    app.router('/users/123', (route) => [
-      route('/users', [
-        route('/:user', function (state, prev) {
-          t.ok(prev.params)
-        })
-      ])
-    ])
-
-    app.start()
-  })
 })
 
 function resetLocation () {