Add unit tests.

These test the complete workflow as the user experiences it when
clicking "Start".
Intended usage:
    (1) Run sdktool to set up a kit with the toolchain you want
        to test against (using a temporary directory).
        The tests assume exactly one Kit to be present.
    (2) Start Creator with a matching settings path and
        "-load ClangStaticAnalyzer -test ClangStaticAnalyzer".
    (3) Repeat until all toolchains have been tested.
The initial implementation tests one trivial source file
with both qbs and qmake.

Change-Id: I810f23e2990a789a4dd9f1dd16335fbcf5c5f39f
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>

plugins/clangstaticanalyzer/clangstaticanalyzerplugin.cpp

@@ -22,6 +22,10 @@
 #include "clangstaticanalyzerruncontrolfactory.h"
 #include "clangstaticanalyzertool.h"
 
+#ifdef WITH_TESTS
+#include "clangstaticanalyzerunittests.h"
+#endif
+
 #include <analyzerbase/analyzermanager.h>
 #include <coreplugin/icore.h>
 #include <coreplugin/icontext.h>
@@ -156,5 +160,14 @@ ExtensionSystem::IPlugin::ShutdownFlag ClangStaticAnalyzerPlugin::aboutToShutdow
     return SynchronousShutdown;
 }
 
+QList<QObject *> ClangStaticAnalyzerPlugin::createTestObjects() const
+{
+    QList<QObject *> tests;
+#ifdef WITH_TESTS
+    tests << new ClangStaticAnalyzerUnitTests(m_analyzerTool);
+#endif
+    return tests;
+}
+
 } // namespace Internal
 } // namespace ClangStaticAnalyzerPlugin