Make the test case fail without testing it

Useful when the compilation or the before_test failed.

Property definitions

nitc $ TestCase :: fail
	# Make the test case fail without testing it
	#
	# Useful when the compilation or the before_test failed.
	fun fail(message: String) do
		is_done = true
		error = message
		toolcontext.modelbuilder.failed_tests += 1
	end
src/testing/testing_suite.nit:450,2--457,4