Improve mock #1542

Job	Run time
CI (ubuntu-22.04, 6.4, e2ee)	3m 28s
CI (ubuntu-22.04, 6.4)	2m 5s
CI (ubuntu-22.04, 6.4, GCC, e2ee)	5m 24s
CI (ubuntu-22.04, 6.4, GCC)	2m 51s
CI (ubuntu-22.04, 5.15, e2ee)	3m 44s
CI (macos-11, 6.4, e2ee)	9m 32s
CI (macos-11, 6.4)	4m 4s
CI (macos-11, 5.15, e2ee)	6m 7s
CI (windows-2019, 6.4, e2ee)	4m 8s
CI (windows-2019, 6.4)	2m 36s
CI (windows-2019, 5.15, e2ee)	2m 43s
CI (ubuntu-22.04, 5.15, e2ee, update-api, codeql)	2m 28s
CI (ubuntu-22.04, 5.15, GCC, update-api)	1m 31s
	50m 41s

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