PHPUnit_Framework_Assert::assertTag has been deprecated in PHPUnit 4.2. Because we configure our test runs to raise deprecation warnings as errors, PHPUnit considers the test run to have failed.
See https://travis-ci.org/wikimedia/mediawiki-core/jobs/32487532 for an example.
See https://github.com/sebastianbergmann/phpunit/issues/1292 for the discussion that led to the deprecation of the assert method.
Version: unspecified
Severity: normal