Tests

Rename "extension providers" to "extensions" #2

Job	Run time
Tests (8.4, ubuntu-latest, prefer-lowest)	17s
Tests (8.4, macos-latest, prefer-lowest)	2m 3s
Tests (8.5, ubuntu-latest, prefer-stable)	24s
Tests (8.5, windows-latest, prefer-lowest)	1m 10s
Tests (8.5, ubuntu-latest, prefer-lowest)	19s
Tests (8.5, macos-latest, prefer-lowest)	1m 27s
Tests (8.4, ubuntu-latest, prefer-stable)	15s
Tests (8.4, macos-latest, prefer-stable)	1m 23s
Tests (8.4, windows-latest, prefer-lowest)	1m 35s
Tests (8.5, macos-latest, prefer-stable)	1m 22s
Tests (8.5, windows-latest, prefer-stable)	1m 1s
Tests (8.4, windows-latest, prefer-stable)	40s
	11m 56s

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