One of the major pain points of updating dependencies is the strict version requirements developers place on their packages.
If you see your PHPUnit outputting the test dots onto new lines like so:
1PHPUnit 8.5.3 by Sebastian Bergmann and contributors.23..188.8.131.52. 6 / 6 (100%)
It usually means you have a line break before an opening PHP tag:
<?php or after an ending PHP tag (if you use those):
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