add a basic integration test for Flutter

scripts/slave/recipes/flutter/flutter.py

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import contextlib
 
 DEPS = [
   'depot_tools/git',
   'file',
   'gsutil',
@@ skipping 36 matching lines @@
       api.step('test %s' % path, ['flutter', 'test'], cwd=checkout.join(path))
 
   _pub_test('packages/cassowary')
   _flutter_test('packages/flutter')
   _pub_test('packages/flutter_tools')
   _pub_test('packages/flx')
   _pub_test('packages/newton')
 
   _flutter_test('examples/stocks')
 
+def TestCreateAndLaunch(api):
+  with MakeTempDir(api) as temp_dir:
+    api.step('test create', ['flutter', 'create', '--with-driver-test',
+        'sample_app'], cwd=temp_dir)
+    app_path = temp_dir.join('sample_app')
+    api.step('drive sample_app', ['flutter', 'drive'], cwd=app_path)
 
 # TODO(eseidel): Would be nice to have this on api.path or api.file.
 @contextlib.contextmanager
 def MakeTempDir(api):
   try:
     temp_dir = api.path.mkdtemp('tmp')
     yield temp_dir
   finally:
     api.file.rmtree('temp dir', temp_dir)
 
@@ skipping 83 matching lines @@
 
   # The context adds dart-sdk tools to PATH sets PUB_CACHE.
   with api.step.context({'env': env}):
     # Must be first to download dependencies for later steps.
     api.step('flutter doctor', ['flutter', 'doctor'])
     api.step('update packages', ['flutter', 'update-packages'])
     AnalyzeFlutter(api)
     TestFlutterPackagesAndExamples(api)
     BuildExamples(api, git_hash)
 
+    # TODO(yjbanov): we do not yet have Android devices hooked up, nor do we
+    # support the Android emulator. For now, only run on iOS Simulator.
+    if api.platform.is_mac:
+      TestCreateAndLaunch(api)
+
     # TODO(eseidel): We only want to generate one copy of the docs at a time
     # otherwise multiple rsyncs could race, causing badness. We'll eventually
     # need both a lock on the bucket, as well as some assurance that we're
     # always moving the docs forward. Possibly by using a separate builder.
     # Until then, only generate on linux to reduce the chance of race.
     if api.platform.is_linux:
       # TODO(eseidel): Is there a way for GenerateDocs to read PUB_CACHE from
       # the env instead of me passing it in?
       GenerateDocs(api, pub_cache)
 
 
 def GenTests(api):
   for platform in ('mac', 'linux'):
     yield (api.test(platform) + api.platform(platform, 64) +
         api.properties(clobber=''))