tryserver recipe_module: Add get_tags.

recipe_modules/tryserver/example.py

Index: recipe_modules/tryserver/example.py
diff --git a/recipe_modules/tryserver/example.py b/recipe_modules/tryserver/example.py
index c1bddc461daf231a8f2fe7ef68fa6d7c0fd19eb9..96b9e0bfa7bf584a489168d1033ff92b2f429785 100644
--- a/recipe_modules/tryserver/example.py
+++ b/recipe_modules/tryserver/example.py
@@ -3,17 +3,30 @@
 # found in the LICENSE file.
 
 DEPS = [
+  'recipe_engine/json',
+  'recipe_engine/raw_io',
   'recipe_engine/path',
   'recipe_engine/platform',
   'recipe_engine/properties',
   'recipe_engine/python',
+  'recipe_engine/step',
   'tryserver',
 ]
 
 
 def RunSteps(api):
   api.path['checkout'] = api.path['slave_build']
+  if api.properties.get('patch_text'):
+    api.step('patch_text test', [
+        'echo', str(api.tryserver.get_footers(api.properties['patch_text']))])
+    api.step('patch_text test', [
+        'echo', str(api.tryserver.get_footer(
+            'Foo', api.properties['patch_text']))])
+    return
+
   api.tryserver.maybe_apply_issue()
+  if api.tryserver.can_apply_issue:
+    api.tryserver.get_footers()
   api.tryserver.get_files_affected_by_patch(
       api.properties.get('test_patch_root'))
 
@@ -30,6 +43,8 @@ def RunSteps(api):
 
 
 def GenTests(api):
+  description_step = api.override_step_data(
+      'git_cl description', stdout=api.raw_io.output('foobar'))
   yield (api.test('with_svn_patch') +
          api.properties(patch_url='svn://checkout.url'))
 
@@ -41,13 +56,27 @@ def GenTests(api):
               patch_ref='johndoe#123.diff'))
 
   yield (api.test('with_rietveld_patch') +
-         api.properties.tryserver())
+         api.properties.tryserver() +
+         description_step)
 
   yield (api.test('with_wrong_patch') + api.platform('win', 32))
 
-
   yield (api.test('with_rietveld_patch_new') +
-         api.properties.tryserver(test_patch_root='sub/project'))
+         api.properties.tryserver(test_patch_root='sub/project') +
+         description_step)
 
   yield (api.test('with_wrong_patch_new') + api.platform('win', 32) +
          api.properties(test_patch_root='sub\\project'))
+
+  yield (api.test('basic_tags') +
+         api.properties(
+             patch_text='hihihi\nfoo:bar\nbam:baz',
+             footer='foo'
+         ) +
+         api.step_data(
+             'parse description',
+             api.json.output({'Foo': ['bar']})) +
+         api.step_data(
+             'parse description (2)',
+             api.json.output({'Foo': ['bar']}))
+  )