Revert of Cherry-pick buildbot 95deef27d7c531ead19e0ac86a9aa1546d4ee7f9:

third_party/buildbot_8_4p1/buildbot/test/unit/test_db_pool.py

Index: third_party/buildbot_8_4p1/buildbot/test/unit/test_db_pool.py
diff --git a/third_party/buildbot_8_4p1/buildbot/test/unit/test_db_pool.py b/third_party/buildbot_8_4p1/buildbot/test/unit/test_db_pool.py
index 35d480223928e6bddd678aaf55df0087d37f0082..09d0e21d7a35180933b924c4a11cb73eb31d02cc 100644
--- a/third_party/buildbot_8_4p1/buildbot/test/unit/test_db_pool.py
+++ b/third_party/buildbot_8_4p1/buildbot/test/unit/test_db_pool.py
@@ -13,11 +13,9 @@
 #
 # Copyright Buildbot Team Members
 
-import os
-import time
 import sqlalchemy as sa
 from twisted.trial import unittest
-from twisted.internet import defer, reactor
+from twisted.internet import defer
 from buildbot.db import pool
 from buildbot.test.util import db
 
@@ -105,49 +103,6 @@
         d.addCallback( lambda r : self.pool.do_with_engine(insert_into_table))
         return d
 
-
-class Stress(unittest.TestCase):
-
-    def setUp(self):
-        setup_engine = sa.create_engine('sqlite:///test.sqlite')
-        setup_engine.execute("pragma journal_mode = wal")
-        setup_engine.execute("CREATE TABLE test (a integer, b integer)")
-
-        self.engine = sa.create_engine('sqlite:///test.sqlite')
-        self.engine.optimal_thread_pool_size = 2
-        self.pool = pool.DBThreadPool(self.engine)
-
-    def tearDown(self):
-        self.pool.shutdown()
-        os.unlink("test.sqlite")
-
-    @defer.deferredGenerator
-    def test_inserts(self):
-        def write(conn):
-            trans = conn.begin()
-            conn.execute("INSERT INTO test VALUES (1, 1)")
-            time.sleep(31)
-            trans.commit()
-        d1 = self.pool.do(write)
-
-        def write2(conn):
-            trans = conn.begin()
-            conn.execute("INSERT INTO test VALUES (1, 1)")
-            trans.commit()
-        d2 = defer.Deferred()
-        d2.addCallback(lambda _ :
-            self.pool.do(write2))
-        reactor.callLater(0.1, d2.callback, None)
-
-        wfd = defer.waitForDeferred(
-            defer.DeferredList([ d1, d2 ]))
-        yield wfd
-        wfd.getResult()
-
-    # don't run this test, since it takes 30s
-    del test_inserts
-
-
 class Native(unittest.TestCase, db.RealDatabaseMixin):
 
     # similar tests, but using the BUILDBOT_TEST_DB_URL