""")
test.write('SConstruct', """
-B = Builder(name = "B", action = "python build.py %(target)s %(source)s")
+B = Builder(name = "B", action = "python build.py $targets $sources")
env = Environment(BUILDERS = [B])
env.B(target = 'f1.out', source = 'f1.in')
env.B(target = 'f2.out', source = 'f2.in')