Partial work on test case for 5041

test_ec2.patch

diff --git a/master/buildbot/test/unit/worker/test_ec2.py b/master/buildbot/test/unit/worker/test_ec2.py
index 3342671ed..0d91f8481 100644
--- a/master/buildbot/test/unit/worker/test_ec2.py
+++ b/master/buildbot/test/unit/worker/test_ec2.py
@@ -17,6 +17,7 @@
 import os
 
 from twisted.trial import unittest
+from twisted.python import log
 
 from buildbot.test.util.decorators import flaky
 from buildbot.test.util.warnings import assertNotProducesWarnings
@@ -437,6 +438,36 @@ class TestEC2LatentWorker(unittest.TestCase):
                                  )
         bs._poll_resolution = 0
         instance_id, _, _ = bs._start_instance()
+
+        instances = r.instances.filter(
+            Filters=[{'Name': 'instance-state-name', 'Values': ['running']}])
+        instances = list(instances)
+        self.assertTrue(bs.spot_instance)
+        self.assertEqual(bs.product_description, product_description)
+        self.assertEqual(len(instances), 1)
+        self.assertEqual(instances[0].id, instance_id)
+        self.assertIsNone(instances[0].tags)
+
+    @mock_ec2
+    def test_start_spot_instance_slow_startup(self):
+        c, r = self.botoSetup('latent_buildbot_slave')
+        amis = list(r.images.all())
+        product_description = 'Linux/Unix'
+        bs = ec2.EC2LatentWorker('bot1', 'sekrit', 'm1.large',
+                                 identifier='publickey',
+                                 secret_identifier='privatekey',
+                                 keypair_name='keypair_name',
+                                 security_name='security_name',
+                                 ami=amis[0].id, spot_instance=True,
+                                 max_spot_price=1.5,
+                                 product_description=product_description,
+                                 region='us-west-1',
+                                 placement='b'
+                                 )
+        bs._poll_resolution = 0
+
+        instance_id, _, _ = bs._request_spot_instance()
+
         instances = r.instances.filter(
             Filters=[{'Name': 'instance-state-name', 'Values': ['running']}])
         instances = list(instances)