# Copyright 2019 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 or at
# https://developers.google.com/open-source/licenses/bsd

"""Unittests for monorail.feature.alert2issue."""
from __future__ import print_function
from __future__ import division
from __future__ import absolute_import

import email
import unittest
from mock import patch
try:
  from mox3 import mox
except ImportError:
  import mox
from parameterized import parameterized

from features import alert2issue
from framework import authdata
from framework import emailfmt
from proto import tracker_pb2
from services import service_manager
from testing import fake
from testing import testing_helpers
from tracker import tracker_helpers

AlertEmailHeader = emailfmt.AlertEmailHeader


class TestData(object):
  """Contains constants or such objects that are intended to be read-only."""
  cnxn = 'fake cnxn'
  test_issue_local_id = 100
  component_id = 123
  trooper_queue = 'my-trooper-bug-queue'

  project_name = 'proj'
  project_addr = '%s+ALERT+%s@monorail.example.com' % (
      project_name, trooper_queue)
  project_id = 987

  from_addr = 'user@monorail.example.com'
  user_id = 111

  msg_body = 'this is the body'
  msg_subject = 'this is the subject'
  msg = testing_helpers.MakeMessage(
      testing_helpers.ALERT_EMAIL_HEADER_LINES, msg_body)

  incident_id = msg.get(AlertEmailHeader.INCIDENT_ID)
  incident_label = alert2issue._GetIncidentLabel(incident_id)

  # All the tests in this class use the following alert properties, and
  # the generator functions/logic should be tested in a separate class.
  alert_props = {
      'owner_id': 0,
      'cc_ids': [],
      'status': 'Available',
      'incident_label': incident_label,
      'priority': 'Pri-0',
      'trooper_queue': trooper_queue,
      'field_values': [],
      'labels': [
          'Restrict-View-Google', 'Pri-0', incident_label, trooper_queue
      ],
      'component_ids': [component_id],
  }


class ProcessEmailNotificationTests(unittest.TestCase, TestData):
  """Implements unit tests for alert2issue.ProcessEmailNotification."""
  def setUp(self):
    # services
    self.services = service_manager.Services(
        config=fake.ConfigService(),
        issue=fake.IssueService(),
        user=fake.UserService(),
        usergroup=fake.UserGroupService(),
        project=fake.ProjectService(),
        features=fake.FeaturesService())

    # project
    self.project = self.services.project.TestAddProject(
        self.project_name, project_id=self.project_id,
        process_inbound_email=True, contrib_ids=[self.user_id])

    # config
    proj_config = fake.MakeTestConfig(self.project_id, [], ['Available'])
    comp_def_1 = tracker_pb2.ComponentDef(
        component_id=123, project_id=987, path='FOO', docstring='foo docstring')
    proj_config.component_defs = [comp_def_1]
    self.services.config.StoreConfig(self.cnxn, proj_config)

    # sender
    self.auth = authdata.AuthData(user_id=self.user_id, email=self.from_addr)

    # issue
    self.issue = tracker_pb2.Issue(
        project_id=self.project_id,
        local_id=self.test_issue_local_id,
        summary=self.msg_subject,
        reporter_id=self.user_id,
        component_ids=[self.component_id],
        status=self.alert_props['status'],
        labels=self.alert_props['labels'],
    )
    self.services.issue.TestAddIssue(self.issue)

    # Patch send_notifications functions.
    self.notification_patchers = [
        patch('features.send_notifications.%s' % func, spec=True)
        for func in [
            'PrepareAndSendIssueBlockingNotification',
            'PrepareAndSendIssueChangeNotification',
        ]
    ]
    self.blocking_notification = self.notification_patchers[0].start()
    self.blocking_notification = self.notification_patchers[1].start()

    self.mox = mox.Mox()

  def tearDown(self):
    self.notification_patchers[0].stop()
    self.notification_patchers[1].stop()

    self.mox.UnsetStubs()
    self.mox.ResetAll()

  def testGoogleAddrsAreAllowlistedSender(self):
    self.assertTrue(alert2issue.IsAllowlisted('test@google.com'))
    self.assertFalse(alert2issue.IsAllowlisted('test@notgoogle.com'))

  def testSkipNotification_IfFromNonAllowlistedSender(self):
    self.mox.StubOutWithMock(alert2issue, 'IsAllowlisted')
    alert2issue.IsAllowlisted(self.from_addr).AndReturn(False)

    # None of them should be called, if the sender has not been allowlisted.
    self.mox.StubOutWithMock(self.services.issue, 'CreateIssueComment')
    self.mox.StubOutWithMock(self.services.issue, 'CreateIssue')
    self.mox.ReplayAll()

    alert2issue.ProcessEmailNotification(
        self.services, self.cnxn, self.project, self.project_addr,
        self.from_addr, self.auth, self.msg_subject, self.msg_body,
        self.incident_label, self.msg, self.trooper_queue)
    self.mox.VerifyAll()

  def testSkipNotification_TooLongComment(self):
    self.mox.StubOutWithMock(alert2issue, 'IsAllowlisted')
    alert2issue.IsAllowlisted(self.from_addr).AndReturn(True)
    self.mox.StubOutWithMock(alert2issue, 'IsCommentSizeReasonable')
    alert2issue.IsCommentSizeReasonable(
        'Filed by %s on behalf of %s\n\n%s' %
        (self.auth.email, self.from_addr, self.msg_body)).AndReturn(False)

    # None of them should be called, if the comment is too long.
    self.mox.StubOutWithMock(self.services.issue, 'CreateIssueComment')
    self.mox.StubOutWithMock(self.services.issue, 'CreateIssue')
    self.mox.ReplayAll()

    alert2issue.ProcessEmailNotification(
        self.services, self.cnxn, self.project, self.project_addr,
        self.from_addr, self.auth, self.msg_subject, self.msg_body,
        self.incident_label, self.msg, self.trooper_queue)
    self.mox.VerifyAll()

  def testProcessNotification_IfFromAllowlistedSender(self):
    self.mox.StubOutWithMock(alert2issue, 'IsAllowlisted')
    alert2issue.IsAllowlisted(self.from_addr).AndReturn(True)

    self.mox.StubOutWithMock(tracker_helpers, 'LookupComponentIDs')
    tracker_helpers.LookupComponentIDs(
        ['Infra'],
        mox.IgnoreArg()).AndReturn([1])
    self.mox.StubOutWithMock(self.services.issue, 'CreateIssueComment')
    self.mox.StubOutWithMock(self.services.issue, 'CreateIssue')
    self.mox.ReplayAll()

    # Either of the methods should be called, if the sender is allowlisted.
    with self.assertRaises(mox.UnexpectedMethodCallError):
      alert2issue.ProcessEmailNotification(
          self.services, self.cnxn, self.project, self.project_addr,
          self.from_addr, self.auth, self.msg_subject, self.msg_body,
          self.incident_label, self.msg, self.trooper_queue)

    self.mox.VerifyAll()

  def testIssueCreated_ForNewIncident(self):
    """Tests if a new issue is created for a new incident."""
    self.mox.StubOutWithMock(alert2issue, 'IsAllowlisted')
    alert2issue.IsAllowlisted(self.from_addr).AndReturn(True)

    # FindAlertIssue() returns None for a new incident.
    self.mox.StubOutWithMock(alert2issue, 'FindAlertIssue')
    alert2issue.FindAlertIssue(
        self.services, self.cnxn, self.project.project_id,
        self.incident_label).AndReturn(None)

    # Mock GetAlertProperties() to create the issue with the expected
    # properties.
    self.mox.StubOutWithMock(alert2issue, 'GetAlertProperties')
    alert2issue.GetAlertProperties(
        self.services, self.cnxn, self.project_id, self.incident_id,
        self.trooper_queue, self.msg).AndReturn(self.alert_props)

    self.mox.ReplayAll()
    alert2issue.ProcessEmailNotification(
        self.services, self.cnxn, self.project, self.project_addr,
        self.from_addr, self.auth, self.msg_subject, self.msg_body,
        self.incident_id, self.msg, self.trooper_queue)

    # the local ID of the newly created issue should be +1 from the highest ID
    # in the existing issues.
    comments = self._verifyIssue(self.test_issue_local_id + 1, self.alert_props)
    self.assertEqual(comments[0].content,
                     'Filed by %s on behalf of %s\n\n%s' % (
                         self.from_addr, self.from_addr, self.msg_body))

    self.mox.VerifyAll()

  def testProcessEmailNotification_ExistingIssue(self):
    """When an alert for an ongoing incident comes in, add a comment."""
    self.mox.StubOutWithMock(alert2issue, 'IsAllowlisted')
    alert2issue.IsAllowlisted(self.from_addr).AndReturn(True)

    # FindAlertIssue() returns None for a new incident.
    self.mox.StubOutWithMock(alert2issue, 'FindAlertIssue')
    alert2issue.FindAlertIssue(
        self.services, self.cnxn, self.project.project_id,
        self.incident_label).AndReturn(self.issue)

    # Mock GetAlertProperties() to create the issue with the expected
    # properties.
    self.mox.StubOutWithMock(alert2issue, 'GetAlertProperties')
    alert2issue.GetAlertProperties(
        self.services, self.cnxn, self.project_id, self.incident_id,
        self.trooper_queue, self.msg).AndReturn(self.alert_props)

    self.mox.ReplayAll()

    # Before processing the notification, ensures that there is only 1 comment
    # in the test issue.
    comments = self._verifyIssue(self.test_issue_local_id, self.alert_props)
    self.assertEqual(len(comments), 1)

    # Process
    alert2issue.ProcessEmailNotification(
        self.services, self.cnxn, self.project, self.project_addr,
        self.from_addr, self.auth, self.msg_subject, self.msg_body,
        self.incident_id, self.msg, self.trooper_queue)

    # Now, it should have a new comment added.
    comments = self._verifyIssue(self.test_issue_local_id, self.alert_props)
    self.assertEqual(len(comments), 2)
    self.assertEqual(comments[1].content,
                     'Filed by %s on behalf of %s\n\n%s' % (
                         self.from_addr, self.from_addr, self.msg_body))

    self.mox.VerifyAll()

  def _verifyIssue(self, local_issue_id, alert_props):
    actual_issue = self.services.issue.GetIssueByLocalID(
        self.cnxn, self.project.project_id, local_issue_id)
    actual_comments = self.services.issue.GetCommentsForIssue(
        self.cnxn, actual_issue.issue_id)

    self.assertEqual(actual_issue.summary, self.msg_subject)
    self.assertEqual(actual_issue.status, alert_props['status'])
    self.assertEqual(actual_issue.reporter_id, self.user_id)
    self.assertEqual(actual_issue.component_ids, [self.component_id])
    if alert_props['owner_id']:
      self.assertEqual(actual_issue.owner_id, alert_props['owner_id'])
    self.assertEqual(sorted(actual_issue.labels), sorted(alert_props['labels']))
    return actual_comments


class GetAlertPropertiesTests(unittest.TestCase, TestData):
  """Implements unit tests for alert2issue.GetAlertProperties."""
  def assertSubset(self, lhs, rhs):
    if not (lhs <= rhs):
      raise AssertionError('%s not a subset of %s' % (lhs, rhs))

  def assertCaseInsensitiveEqual(self, lhs, rhs):
    self.assertEqual(lhs if lhs is None else lhs.lower(),
                     rhs if lhs is None else rhs.lower())

  def setUp(self):
    # services
    self.services = service_manager.Services(
        config=fake.ConfigService(),
        issue=fake.IssueService(),
        user=fake.UserService(),
        usergroup=fake.UserGroupService(),
        project=fake.ProjectService())

    # project
    self.project = self.services.project.TestAddProject(
        self.project_name, project_id=self.project_id,
        process_inbound_email=True, contrib_ids=[self.user_id])

    proj_config = fake.MakeTestConfig(
        self.project_id,
        [
            # test labels for Pri field
            'Pri-0', 'Pri-1', 'Pri-2', 'Pri-3',
            # test labels for OS field
            'OS-Android', 'OS-Windows',
            # test labels for Type field
            'Type-Bug', 'Type-Bug-Regression', 'Type-Bug-Security', 'Type-Task',
        ],
        ['Assigned', 'Available', 'Unconfirmed']
    )
    self.services.config.StoreConfig(self.cnxn, proj_config)

    # create a test email message, which tests can alternate the header values
    # to verify the behaviour of a given parser function.
    self.test_msg = email.Message.Message()
    for key, value in self.msg.items():
      self.test_msg[key] = value

    self.mox = mox.Mox()

  @parameterized.expand([
      (None,),
      ('',),
      (' ',),
  ])
  def testDefaultComponent(self, header_value):
    """Checks if the default component is Infra."""
    self.test_msg.replace_header(AlertEmailHeader.COMPONENT, header_value)
    self.mox.StubOutWithMock(tracker_helpers, 'LookupComponentIDs')
    tracker_helpers.LookupComponentIDs(
        ['Infra'],
        mox.IgnoreArg()).AndReturn([self.component_id])

    self.mox.ReplayAll()
    props = alert2issue.GetAlertProperties(
        self.services, self.cnxn, self.project_id, self.incident_id,
        self.trooper_queue, self.test_msg)
    self.assertEqual(props['component_ids'], [self.component_id])
    self.mox.VerifyAll()

  @parameterized.expand([
      # an existing single component with componentID 1
      ({'Infra': 1}, [1]),
      # 3 of existing components
      ({'Infra': 1, 'Foo': 2, 'Bar': 3}, [1, 2, 3]),
      # a non-existing component
      ({'Infra': None}, []),
      # 3 of non-existing components
      ({'Infra': None, 'Foo': None, 'Bar': None}, []),
      # a mix of existing and non-existing components
      ({'Infra': 1, 'Foo': None, 'Bar': 2}, [1, 2]),
  ])
  def testGetComponentIDs(self, components, expected_component_ids):
    """Tests _GetComponentIDs."""
    self.test_msg.replace_header(
        AlertEmailHeader.COMPONENT, ','.join(sorted(components.keys())))

    self.mox.StubOutWithMock(tracker_helpers, 'LookupComponentIDs')
    tracker_helpers.LookupComponentIDs(
        sorted(components.keys()),
        mox.IgnoreArg()).AndReturn(
            [components[key] for key in sorted(components.keys())
             if components[key]]
        )

    self.mox.ReplayAll()
    props = alert2issue.GetAlertProperties(
        self.services, self.cnxn, self.project_id, self.incident_id,
        self.trooper_queue, self.test_msg)
    self.assertEqual(sorted(props['component_ids']),
                     sorted(expected_component_ids))
    self.mox.VerifyAll()


  def testLabelsWithNecessaryValues(self):
    """Checks if the labels contain all the necessary values."""
    props = alert2issue.GetAlertProperties(
        self.services, self.cnxn, self.project_id, self.incident_id,
        self.trooper_queue, self.test_msg)

    # This test assumes that the test message contains non-empty values for
    # all the headers.
    self.assertTrue(props['incident_label'])
    self.assertTrue(props['priority'])
    self.assertTrue(props['issue_type'])
    self.assertTrue(props['oses'])

    # Here are a list of the labels that props['labels'] should contain
    self.assertIn('Restrict-View-Google'.lower(), props['labels'])
    self.assertIn(self.trooper_queue, props['labels'])
    self.assertIn(props['incident_label'], props['labels'])
    self.assertIn(props['priority'], props['labels'])
    self.assertIn(props['issue_type'], props['labels'])
    for os in props['oses']:
      self.assertIn(os, props['labels'])

  @parameterized.expand([
      (None, 0),
      ('', 0),
      (' ', 0),
  ])
  def testDefaultOwnerID(self, header_value, expected_owner_id):
    """Checks if _GetOwnerID returns None in default."""
    self.test_msg.replace_header(AlertEmailHeader.OWNER, header_value)
    props = alert2issue.GetAlertProperties(
        self.services, self.cnxn, self.project_id, self.incident_id,
        self.trooper_queue, self.test_msg)
    self.assertEqual(props['owner_id'], expected_owner_id)

  @parameterized.expand(
      [
          # an existing user with userID 1.
          ('owner@example.org', 1),
          # a non-existing user.
          ('owner@example.org', 0),
      ])
  def testGetOwnerID(self, owner, expected_owner_id):
    """Tests _GetOwnerID returns the ID of the owner."""
    self.test_msg.replace_header(AlertEmailHeader.CC, '')
    self.test_msg.replace_header(AlertEmailHeader.OWNER, owner)

    self.mox.StubOutWithMock(self.services.user, 'LookupExistingUserIDs')
    self.services.user.LookupExistingUserIDs(self.cnxn, [owner]).AndReturn(
        {owner: expected_owner_id})

    self.mox.ReplayAll()
    props = alert2issue.GetAlertProperties(
        self.services, self.cnxn, self.project_id, self.incident_id,
        self.trooper_queue, self.test_msg)
    self.mox.VerifyAll()
    self.assertEqual(props['owner_id'], expected_owner_id)

  @parameterized.expand([
      (None, []),
      ('', []),
      (' ', []),
  ])
  def testDefaultCCIDs(self, header_value, expected_cc_ids):
    """Checks if _GetCCIDs returns an empty list in default."""
    self.test_msg.replace_header(AlertEmailHeader.CC, header_value)
    props = alert2issue.GetAlertProperties(
        self.services, self.cnxn, self.project_id, self.incident_id,
        self.trooper_queue, self.test_msg)
    self.assertEqual(props['cc_ids'], expected_cc_ids)

  @parameterized.expand([
      # with one existing user cc-ed.
      ({'user1@example.org': 1}, [1]),
      # with two of existing users.
      ({'user1@example.org': 1, 'user2@example.org': 2}, [1, 2]),
      # with one non-existing user.
      ({'user1@example.org': None}, []),
      # with two of non-existing users.
      ({'user1@example.org': None, 'user2@example.org': None}, []),
      # with a mix of existing and non-existing users.
      ({'user1@example.org': 1, 'user2@example.org': None}, [1]),
  ])
  def testGetCCIDs(self, ccers, expected_cc_ids):
    """Tests _GetCCIDs returns the IDs of the email addresses to be cc-ed."""
    self.test_msg.replace_header(
        AlertEmailHeader.CC, ','.join(sorted(ccers.keys())))
    self.test_msg.replace_header(AlertEmailHeader.OWNER, '')

    self.mox.StubOutWithMock(self.services.user, 'LookupExistingUserIDs')
    self.services.user.LookupExistingUserIDs(
        self.cnxn, sorted(ccers.keys())).AndReturn(ccers)

    self.mox.ReplayAll()
    props = alert2issue.GetAlertProperties(
        self.services, self.cnxn, self.project_id, self.incident_id,
        self.trooper_queue, self.test_msg)
    self.mox.VerifyAll()
    self.assertEqual(sorted(props['cc_ids']), sorted(expected_cc_ids))

  @parameterized.expand([
      # None and '' should result in the default priority returned.
      (None, 'Pri-2'),
      ('', 'Pri-2'),
      (' ', 'Pri-2'),

      # Tests for valid priority values
      ('0', 'Pri-0'),
      ('1', 'Pri-1'),
      ('2', 'Pri-2'),
      ('3', 'Pri-3'),

      # Tests for invalid priority values
      ('test', 'Pri-2'),
      ('foo', 'Pri-2'),
      ('critical', 'Pri-2'),
      ('4', 'Pri-2'),
      ('3x', 'Pri-2'),
      ('00', 'Pri-2'),
      ('01', 'Pri-2'),
  ])
  def testGetPriority(self, header_value, expected_priority):
    """Tests _GetPriority."""
    self.test_msg.replace_header(AlertEmailHeader.PRIORITY, header_value)
    props = alert2issue.GetAlertProperties(
        self.services, self.cnxn, self.project_id, self.incident_id,
        self.trooper_queue, self.test_msg)
    self.assertCaseInsensitiveEqual(props['priority'], expected_priority)

  @parameterized.expand([
      (None, 'Available'),
      ('', 'Available'),
      (' ', 'Available'),
  ])
  def testDefaultStatus(self, header_value, expected_status):
    """Checks if _GetStatus return Available in default."""
    self.test_msg.replace_header(AlertEmailHeader.STATUS, header_value)
    props = alert2issue.GetAlertProperties(
        self.services, self.cnxn, self.project_id, self.incident_id,
        self.trooper_queue, self.test_msg)
    self.assertCaseInsensitiveEqual(props['status'], expected_status)

  @parameterized.expand([
      ('random_status', True, 'random_status'),
      # If the status is not one of the open statuses, the default status
      # should be returned instead.
      ('random_status', False, 'Available'),
  ])
  def testGetStatusWithoutOwner(self, status, means_open, expected_status):
    """Tests GetStatus without an owner."""
    self.test_msg.replace_header(AlertEmailHeader.STATUS, status)
    self.mox.StubOutWithMock(tracker_helpers, 'MeansOpenInProject')
    tracker_helpers.MeansOpenInProject(status, mox.IgnoreArg()).AndReturn(
        means_open)

    self.mox.ReplayAll()
    props = alert2issue.GetAlertProperties(
        self.services, self.cnxn, self.project_id, self.incident_id,
        self.trooper_queue, self.test_msg)
    self.assertCaseInsensitiveEqual(props['status'], expected_status)
    self.mox.VerifyAll()

  @parameterized.expand([
      # If there is an owner, the status should always be Assigned.
      (None, 'Assigned'),
      ('', 'Assigned'),
      (' ', 'Assigned'),

      ('random_status', 'Assigned'),
      ('Available', 'Assigned'),
      ('Unconfirmed', 'Assigned'),
      ('Fixed', 'Assigned'),
  ])
  def testGetStatusWithOwner(self, status, expected_status):
    """Tests GetStatus with an owner."""
    owner = 'owner@example.org'
    self.test_msg.replace_header(AlertEmailHeader.OWNER, owner)
    self.test_msg.replace_header(AlertEmailHeader.CC, '')
    self.test_msg.replace_header(AlertEmailHeader.STATUS, status)

    self.mox.StubOutWithMock(self.services.user, 'LookupExistingUserIDs')
    self.services.user.LookupExistingUserIDs(self.cnxn, [owner]).AndReturn(
        {owner: 1})

    self.mox.ReplayAll()
    props = alert2issue.GetAlertProperties(
        self.services, self.cnxn, self.project_id, self.incident_id,
        self.trooper_queue, self.test_msg)
    self.assertCaseInsensitiveEqual(props['status'], expected_status)
    self.mox.VerifyAll()

  @parameterized.expand(
      [
          # None and '' should result in None returned.
          (None, None),
          ('', None),
          (' ', None),

          # allowlisted issue types
          ('Bug', 'Type-Bug'),
          ('Bug-Regression', 'Type-Bug-Regression'),
          ('Bug-Security', 'Type-Bug-Security'),
          ('Task', 'Type-Task'),

          # non-allowlisted issue types
          ('foo', None),
          ('bar', None),
          ('Bug,Bug-Regression', None),
          ('Bug,', None),
          (',Task', None),
      ])
  def testGetIssueType(self, header_value, expected_issue_type):
    """Tests _GetIssueType."""
    self.test_msg.replace_header(AlertEmailHeader.TYPE, header_value)
    props = alert2issue.GetAlertProperties(
        self.services, self.cnxn, self.project_id, self.incident_id,
        self.trooper_queue, self.test_msg)
    self.assertCaseInsensitiveEqual(props['issue_type'], expected_issue_type)

  @parameterized.expand(
      [
          # None and '' should result in an empty list returned.
          (None, []),
          ('', []),
          (' ', []),

          # a single, allowlisted os
          ('Android', ['OS-Android']),
          # a single, non-allowlisted OS
          ('Bendroid', []),
          # multiple, allowlisted oses
          ('Android,Windows', ['OS-Android', 'OS-Windows']),
          # multiple, non-allowlisted oses
          ('Bendroid,Findows', []),
          # a mix of allowlisted and non-allowlisted oses
          ('Android,Findows,Windows,Bendroid', ['OS-Android', 'OS-Windows']),
          # a mix of allowlisted and non-allowlisted oses with trailing commas.
          ('Android,Findows,Windows,Bendroid,,', ['OS-Android', 'OS-Windows']),
          # a mix of allowlisted and non-allowlisted oses with commas at the
          # beginning.
          (
              ',,Android,Findows,Windows,Bendroid,,',
              ['OS-Android', 'OS-Windows']),
      ])
  def testGetOSes(self, header_value, expected_oses):
    """Tests _GetOSes."""
    self.test_msg.replace_header(AlertEmailHeader.OS, header_value)
    props = alert2issue.GetAlertProperties(
        self.services, self.cnxn, self.project_id, self.incident_id,
        self.trooper_queue, self.test_msg)
    self.assertEqual(sorted(os if os is None else os.lower()
                            for os in props['oses']),
                     sorted(os if os is None else os.lower()
                            for os in expected_oses))

  @parameterized.expand([
      # None and '' should result in an empty list + RSVG returned.
      (None, []),
      ('', []),
      (' ', []),

      ('Label-1', ['label-1']),
      ('Label-1,Label-2', ['label-1', 'label-2',]),
      ('Label-1,Label-2,Label-3', ['label-1', 'label-2', 'label-3']),

      # Duplicates should be removed.
      ('Label-1,Label-1', ['label-1']),
      ('Label-1,label-1', ['label-1']),
      (',Label-1,label-1,', ['label-1']),
      ('Label-1,label-1,', ['label-1']),
      (',Label-1,,label-1,,,', ['label-1']),
      ('Label-1,Label-2,Label-1', ['label-1', 'label-2']),

      # Whitespaces should be removed from labels.
      ('La bel - 1 ', ['label-1']),
      ('La bel - 1 , Label- 1', ['label-1']),
      ('La bel- 1 , Label - 2', ['label-1', 'label-2']),

      # RSVG should be set always.
      ('Label-1,Label-1,Restrict-View-Google', ['label-1']),
  ])
  def testGetLabels(self, header_value, expected_labels):
    """Tests _GetLabels."""
    self.test_msg.replace_header(AlertEmailHeader.LABEL, header_value)
    props = alert2issue.GetAlertProperties(
        self.services, self.cnxn, self.project_id, self.incident_id,
        self.trooper_queue, self.test_msg)

    # Check if there are any duplicates
    labels = set(props['labels'])
    self.assertEqual(sorted(props['labels']), sorted(list(labels)))

    # Check the labels that shouldb always be included
    self.assertIn('Restrict-View-Google'.lower(), labels)
    self.assertIn(props['trooper_queue'], labels)
    self.assertIn(props['incident_label'], labels)
    self.assertIn(props['priority'], labels)
    self.assertIn(props['issue_type'], labels)
    self.assertSubset(set(props['oses']), labels)

    # All the custom labels should be present.
    self.assertSubset(set(expected_labels), labels)