Use mock server in test #398

Job	Run time
Tests (ubuntu-latest, 7.4, lowest, ^5)	2m 25s
Tests (ubuntu-latest, 8.0, highest, ^5)	2m 42s
Tests (ubuntu-latest, 8.0, lowest, ^6)	2m 28s
Tests (ubuntu-latest, 8.0, lowest, ^5)	2m 40s
Tests (ubuntu-latest, 7.4, highest, ^5)	2m 42s
Tests (ubuntu-latest, 8.1, lowest, ^5)	2m 32s
Tests (ubuntu-latest, 8.1, highest, ^6)	2m 38s
Tests (ubuntu-latest, 8.0, highest, ^6)	2m 31s
Tests (ubuntu-latest, 8.2, lowest, ^7)	2m 30s
Tests (ubuntu-latest, 8.1, highest, ^5)	2m 42s
Tests (ubuntu-latest, 8.1, lowest, ^6)	2m 31s
Tests (ubuntu-latest, 8.2, lowest, ^5)	2m 30s
Tests (ubuntu-latest, 8.2, highest, ^6)	2m 31s
Tests (ubuntu-latest, 8.2, lowest, ^6)	1m 23s
Tests (ubuntu-latest, 8.2, highest, ^5)	2m 27s
Tests (ubuntu-latest, 8.3, highest, ^5)	2m 36s
Tests (ubuntu-latest, 8.3, highest, ^6)	2m 51s
Tests (macos-latest, 8.0, highest, ^5)	2m 58s
Tests (windows-latest, 8.0, highest, 5.4.2)	3m 22s
Tests (ubuntu-latest, 8.3, lowest, ^7)	2m 34s
Tests (ubuntu-latest, 8.3, lowest, ^5)	2m 27s
Tests (ubuntu-latest, 8.2, highest, ^7)	1m 26s
Tests (ubuntu-latest, 8.3, lowest, ^6)	1m 31s
Tests (ubuntu-latest, 8.3, highest, ^7)	2m 25s
	59m 22s

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