Im running tests separatedly:
phpunit --log-junit result.xml Class1Test.php --coverage-php coverage.php --coverage-html, /codecoverage/ --whitelist Class1.php
phpunit --log-junit result.xml Class2Test.php --coverage-php coverage.php --coverage-html, /codecoverage/ --whitelist Class2.php
phpunit --log-junit result.xml Class3Test.php --coverage-php coverage.php --coverage-html, /codecoverage/ --whitelist Class3.php
the problem is, the coverage (both .html and .php) always overwrites the last. Any chance to merge/append to the last instead?