Tests

Ensures the pubspec.yaml state matches the hidden .clojuredart/deps -… #439

Job	Run time
testing-on-dart2 (ubuntu-latest)	1m 36s
testing-on-dart-stable (ubuntu-latest)	1m 27s
testing-on-dart2 (macOS-latest)	3m 18s
testing-on-dart-stable (macOS-latest)	3m 23s
	9m 44s

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