test_that("Multiple Synthetic Units Works", {
	skip_on_cran()
  library(Synth)
	data(synth.data)
	set.seed(42)
	
	multi <- multiple.synth(foo = synth.data,
	predictors = c("X1", "X2", "X3"),
	predictors.op = "mean",
	dependent = "Y",
	unit.variable = "unit.num",
	time.variable = "year",
	treatment.time = 1983,
	special.predictors = list(
		list("Y", 1991, "mean"),
		list("Y", 1985, "mean"),
		list("Y", 1980, "mean")
	),
	treated.units = 7,
	control.units = c(29, 2, 13, 17, 32, 38),
	time.predictors.prior = c(1984:1989),
	time.optimize.ssr = c(1984:1990),
	unit.names.variable = "name",
	time.plot = 1984:1996, gen.placebos = TRUE, Sigf.ipop = 3 )
	
	expect_true(is_tdf_multi(multi))
	
	})