add decorator tests
fix decorator tests
extract test preparig part to the class
Merge remote-tracking branch 'remotes/origin/master' into simon

Conflicts:
	plugins/diagramEditor/test/jetbrains.mps.lang.editor.diagram.tests/models/jetbrains/mps/lang/editor/diagram/tests@tests.mps
make after merge
run generators runner
add ITestCases
add selection frame visibility testing
Merge remote-tracking branch 'remotes/origin/master' into simon
make after merge
Merge remote-tracking branch 'origin/master' into simon
make after merge
set cross totally unvusible if there's no segments
split && assertions in the tests
Merge remote-tracking branch 'origin/master' into simon
make after merge
fix race condition
Merge remote-tracking branch 'origin/master' into simon
make after merge
fix broken link
Merge remote-tracking branch 'origin/master' into simon