ENH: add the source_group() demo to the tests

Alex

Tests/CMakeLists.txt

@@ -48,6 +48,7 @@ IF(BUILD_TESTING)
   ADD_TEST_MACRO(Framework bar)
   ADD_TEST_MACRO(Properties Properties)
   ADD_TEST_MACRO(Assembler HelloAsm)
+  ADD_TEST_MACRO(SourceGroups SourceGroups)
 
   # add tests with more complex invocations
   ADD_TEST(TargetName ${CMAKE_CTEST_COMMAND}

Tests/SourceGroups/CMakeLists.txt

@@ -1,3 +1,12 @@
+project(SourceGroups)
+
+# this is not really a test which can fail
+# it is more an example with several source_group() 
+# commands.
+# The created projects have to be loaded manually 
+# in Visual Studio/XCode/Eclipse/...
+# to see whether the correct groups have been created.
+
 source_group(Base             FILES main.c)
 
 # a sub group