Use mock server in test #422

Job	Run time
Tests (ubuntu-latest, 8.0, lowest, ^6)	1m 32s
Tests (ubuntu-latest, 8.1, highest, ^6)	1m 21s
Tests (ubuntu-latest, 8.1, lowest, ^5)	1m 30s
Tests (ubuntu-latest, 8.2, lowest, ^6)	1m 18s
Tests (ubuntu-latest, 8.0, highest, ^6)	1m 20s
Tests (ubuntu-latest, 8.1, highest, ^5)	1m 28s
Tests (ubuntu-latest, 8.1, lowest, ^6)	1m 16s
Tests (ubuntu-latest, 8.0, lowest, ^5)	1m 30s
Tests (ubuntu-latest, 8.3, lowest, ^5)	1m 18s
Tests (ubuntu-latest, 7.4, lowest, ^5)	1m 17s
Tests (ubuntu-latest, 7.4, highest, ^5)	1m 15s
Tests (ubuntu-latest, 8.2, lowest, ^7)	1m 20s
Tests (ubuntu-latest, 8.2, highest, ^7)	1m 30s
Tests (ubuntu-latest, 8.0, highest, ^5)	1m 25s
Tests (ubuntu-latest, 8.3, lowest, ^7)	1m 19s
Tests (ubuntu-latest, 8.2, highest, ^5)	1m 26s
Tests (macos-latest, 8.0, highest, ^5)	2m 12s
Tests (ubuntu-latest, 8.3, highest, ^5)	1m 17s
Tests (ubuntu-latest, 8.2, highest, ^6)	1m 19s
Tests (ubuntu-latest, 8.3, highest, ^6)	1m 15s
Tests (windows-latest, 8.0, highest, 5.4.2)	2m 32s
Tests (ubuntu-latest, 8.3, highest, ^7)	1m 25s
Tests (ubuntu-latest, 8.2, lowest, ^5)	1m 21s
Tests (ubuntu-latest, 8.3, lowest, ^6)	1m 17s
	34m 43s

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