Many users (albeit mostly in qtdeclarative) of failOnWarning() are passing a catch-all regexp, which is only supported when regular expression support is enabled. Make their lives easier and those checks independent of the feature by adding a third overload, taking no parameter, that fails on any (unanticipated) warning. Implementation is trivial - just put a null QVariant in failOnWarningList; it won't match either check on the entry that might exempt a test from failing on a warning, so any warning at all will trigger failure. [ChangeLog][QtTest] QTest::failOnWarning() now has a no-parameter overload to support the common case of fail-on-any-warning, without needing to construct a match-everything regular expression. Change-Id: Ic693f1c8619fd6e495543b85737d566134cf9d20 Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>