Fix test turning warnings into ErrorExceptions #2904

Job	Run time
Coding Guidelines	27s
Dependency Validation	9s
Type Checker	28s
Unit Tests (ubuntu-latest, 8.1)	10s
Unit Tests (ubuntu-latest, 8.2)	10s
Unit Tests (ubuntu-latest, 8.3)	14s
Unit Tests (ubuntu-latest, 8.4)	10s
Unit Tests (ubuntu-latest, 8.5)	9s
Unit Tests (windows-latest, 8.1)	36s
Unit Tests (windows-latest, 8.2)	36s
Unit Tests (windows-latest, 8.3)	33s
Unit Tests (windows-latest, 8.4)	37s
Unit Tests (windows-latest, 8.5)	36s
End-to-End Tests (ubuntu-latest, 8.1)	39s
End-to-End Tests (ubuntu-latest, 8.2)	40s
End-to-End Tests (ubuntu-latest, 8.3)	38s
End-to-End Tests (ubuntu-latest, 8.4)	40s
End-to-End Tests (ubuntu-latest, 8.5)	38s
End-to-End Tests (windows-latest, 8.1)	1m 34s
End-to-End Tests (windows-latest, 8.2)	1m 38s
End-to-End Tests (windows-latest, 8.3)	1m 43s
End-to-End Tests (windows-latest, 8.4)	1m 39s
End-to-End Tests (windows-latest, 8.5)	1m 40s
Build PHAR	30s
Code Coverage	2m 8s
Test PHAR (8.1, pcov)	15s
Test PHAR (8.1, xdebug)	27s
Test PHAR (8.2, pcov)	21s
Test PHAR (8.2, xdebug)	29s
Test PHAR (8.3, pcov)	21s
Test PHAR (8.3, xdebug)	32s
Test PHAR (8.4, pcov)	17s
Test PHAR (8.4, xdebug)	29s
Test PHAR (8.5, pcov)	16s
Test PHAR (8.5, xdebug)	30s
	22m 59s

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