func (s *ClientSimpleRaceSuite) TestClaimLease_Pathological(c *gc.C) {
	sut := s.EasyFixture(c)
	blocker := s.NewFixture(c, FixtureParams{Id: "blocker"})

	// Set up hooks to claim a lease just before every transaction, but remove
	// it again before the SUT goes and looks to figure out what it should do.
	interfere := jujutxn.TestHook{
		Before: func() {
			err := blocker.Client.ClaimLease("name", lease.Request{"ha-haa", time.Second})
			c.Check(err, jc.ErrorIsNil)
		},
		After: func() {
			blocker.Clock.Advance(time.Minute)
			err := blocker.Client.ExpireLease("name")
			c.Check(err, jc.ErrorIsNil)
		},
	}
	defer txntesting.SetTestHooks(
		c, sut.Runner,
		interfere, interfere, interfere,
	)()

	// Try to claim, and watch the poor thing collapse in exhaustion.
	err := sut.Client.ClaimLease("name", lease.Request{"trying", time.Minute})
	c.Check(err, gc.ErrorMatches, "state changing too quickly; try again soon")
}

func (s *ClientTrickyRaceSuite) TestExtendLease_Pathological(c *gc.C) {

	// Set up hooks to remove the lease just before every transaction, but
	// replace it before the SUT goes and looks to figure out what it should do.
	interfere := jujutxn.TestHook{
		Before: func() {
			s.blocker.Clock.Advance(time.Minute + time.Second)
			err := s.blocker.Client.ExpireLease("name")
			c.Check(err, jc.ErrorIsNil)
		},
		After: func() {
			err := s.blocker.Client.ClaimLease("name", lease.Request{"holder", time.Second})
			c.Check(err, jc.ErrorIsNil)
		},
	}
	defer txntesting.SetTestHooks(
		c, s.sut.Runner,
		interfere, interfere, interfere,
	)()

	// Try to extend, and watch the poor thing collapse in exhaustion.
	err := s.sut.Client.ExtendLease("name", lease.Request{"holder", time.Minute})
	c.Check(err, gc.ErrorMatches, "state changing too quickly; try again soon")
}

func SetTestHooks(c *gc.C, st *State, hooks ...jujutxn.TestHook) txntesting.TransactionChecker {
	runner := jujutxn.NewRunner(jujutxn.RunnerParams{Database: st.db})
	st.transactionRunner = runner
	return txntesting.SetTestHooks(c, runner, hooks...)
}

func SetTestHooks(c *gc.C, st *State, hooks ...jujutxn.TestHook) txntesting.TransactionChecker {
	return txntesting.SetTestHooks(c, newRunnerForHooks(st), hooks...)
}

func SetTestHooks(c *gc.C, st *State, hooks ...jujutxn.TestHook) txntesting.TransactionChecker {
	return txntesting.SetTestHooks(c, st.transactionRunner, hooks...)
}