UnitTests: Fix names and disable slow tests by default

Slow and very slow tests have now their own test category. We add SlowTest
for tests which are slower than ~5ms and VerySlowTest if they are slower
than ~100ms. They are disabled them by "-*SlowTest.*". If you have a faster
machine than most developers simply try lower values. The aim is that most
developers can execute the tests in under ~2s.

In the long run we should use dependency breaking and data sharing to
reduce the count of the slow tests.

Change-Id: I8578071258d7f89b2052709f3dd526ced811483f
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

tests/unit/unittest/clangdocumentprocessor-test.cpp

@@ -72,6 +72,8 @@ protected:
                                                       dummyIpcClient};
 };
 
+using DocumentProcessorSlowTest = DocumentProcessor;
+
 TEST_F(DocumentProcessor, ProcessEmpty)
 {
     const JobRequests jobsStarted = documentProcessor.process();
@@ -79,7 +81,7 @@ TEST_F(DocumentProcessor, ProcessEmpty)
     ASSERT_THAT(jobsStarted.size(), 0);
 }
 
-TEST_F(DocumentProcessor, ProcessSingleJob)
+TEST_F(DocumentProcessorSlowTest, ProcessSingleJob)
 {
     const JobRequest jobRequest = createJobRequest(JobRequest::Type::UpdateDocumentAnnotations);
     documentProcessor.addJob(jobRequest);