Test CI

修复重置 loadingDelay 为 undefined 后，定时器没有被清理而导致 loading 始终为 true 的 bug #1259

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Run time

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Job	Run time
test (normal, 18.x)	1m 18s
test (normal, 20.x)	1m 21s
test (strict, 18.x)	1m 20s
test (strict, 20.x)	1m 12s
	5m 11s