unstable test TestWaitTTLJobFinish

[hawkingrei]

Bug Report

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3. What did you see instead (Required)

 --- FAIL: TestWaitTTLJobFinish (0.05s)
panic: 
assert: mock: The method has been called over 1 times.
	Either do one more Mock.On("GetJob").Return(...), or remove extra call.
	This call was unexpected:
		GetJob(*context.timerCtx,int64,int64,string)
		0: &context.timerCtx{cancelCtx:(*context.cancelCtx)(0xc000178c80), timer:(*time.Timer)(nil), deadline:time.Time{wall:0xc125b5c0f955f6f6, ext:60351749793, loc:(*time.Location)(0xbfa3760)}}
		1: 1
		2: 2
		3: "c2e10aeb-86dc-4812-afea-697b2bc8a25e"
	at: [ttl/ttlworker/timer_test.go:51 ttl/ttlworker/timer.go:213 ttl/ttlworker/timer_test.go:530] [recovered]
	panic: 
assert: mock: The method has been called over 1 times.
	Either do one more Mock.On("GetJob").Return(...), or remove extra call.
	This call was unexpected:
		GetJob(*context.timerCtx,int64,int64,string)
		0: &context.timerCtx{cancelCtx:(*context.cancelCtx)(0xc000178c80), timer:(*time.Timer)(nil), deadline:time.Time{wall:0xc125b5c0f955f6f6, ext:60351749793, loc:(*time.Location)(0xbfa3760)}}
		1: 1
		2: 2
		3: "c2e10aeb-86dc-4812-afea-697b2bc8a25e"
	at: [ttl/ttlworker/timer_test.go:51 ttl/ttlworker/timer.go:213 ttl/ttlworker/timer_test.go:530]
goroutine 142 [running]:
testing.tRunner.func1.2({0x1b47c20, 0xc0012ad040})
	GOROOT/src/testing/testing.go:1526 +0x372
testing.tRunner.func1()
	GOROOT/src/testing/testing.go:1529 +0x650
panic({0x1b47c20, 0xc0012ad040})
	GOROOT/src/runtime/panic.go:890 +0x263
github.com/stretchr/testify/mock.(*Mock).fail(0xc000617ef0, {0x246a6e2, 0xa5}, {0xc0012a6d80, 0x4, 0x4})
	external/com_github_stretchr_testify/mock/mock.go:332 +0x1db
github.com/stretchr/testify/mock.(*Mock).MethodCalled(0xc000617ef0, {0x42fae84, 0x6}, {0xc0012a6a80, 0x4, 0x4})
	external/com_github_stretchr_testify/mock/mock.go:480 +0x33d
github.com/stretchr/testify/mock.(*Mock).Called(0xc0012372f0?, {0xc0012a6a80, 0x4, 0x4})
	external/com_github_stretchr_testify/mock/mock.go:464 +0x1a5
github.com/pingcap/tidb/ttl/ttlworker.(*mockJobAdapter).GetJob(0xc000617ef0, {0x3bf6960?, 0xc00117eea0}, 0xc001182100?, 0x20?, {0xc0012372f0, 0x24})
	ttl/ttlworker/timer_test.go:51 +0x205
github.com/pingcap/tidb/ttl/ttlworker.(*ttlTimerHook).waitJobFinished(0xc000b26de0, 0xc0001e2fc0, 0xc000364060, {0xc001182100, 0x20}, {0xc0012372f0, 0x24}, {0xc125b5b17954f38f, 0xffffffff9dc0af4f, 0xbfa3760})
	ttl/ttlworker/timer.go:213 +0x64e
github.com/pingcap/tidb/ttl/ttlworker.TestWaitTTLJobFinish(0x0?)
	ttl/ttlworker/timer_test.go:530 +0x3df5
testing.tRunner(0xc000af9380, 0x24c6550)
	GOROOT/src/testing/testing.go:1576 +0x217
created by testing.(*T).Run
	GOROOT/src/testing/testing.go:1629 +0x806
-- 

https://tiprow.hawkingrei.com/view/gs/pingcapprow/pr-logs/pull/pingcap_tidb/45434/tiprow_fast_test/1681233855941447680

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