AutoTest: Do not lose information of base classes

In case the base class is defined outside of the file with the
derived class we are missing the correct entry point.
Work around this by getting alternative entry points beforehand
and using them if we cannot find a valid entry point.

Task-number: QTCREATORBUG-17522
Change-Id: I07ef87b2fcdac4f78240da9e57eaa518ff0f4d20
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/autotest/qtest/qttest_utils.h

@@ -35,6 +35,7 @@ namespace QTestUtils {
 
 bool isQTestMacro(const QByteArray &macro);
 QHash<QString, QString> testCaseNamesForFiles(const Core::Id &id, const QStringList &files);
+QMultiHash<QString, QString> alternativeFiles(const Core::Id &id, const QStringList &files);
 
 } // namespace QTestUtils
 } // namespace Internal