test_that("<ggpacket> + <ggplot layer constructor> adds as ggcall", {
  expect_equal({
    ggpk <- ggpacket() + geom_line()
    ggpk@ggcalls[[1]][[1]][[1]]
  }, {
    rlang::quo(geom_line)
  })

  expect_equal({
    ggpk <- ggpacket() + geom_line(linewidth = 3L)
    as.list(ggpk@ggcalls[[1]][[1]][2])
  }, {
    list(linewidth = rlang::quo(3L))
  })

  expect_equal({
    ggpk <- ggpacket() + geom_line(linewidth = 3L) + geom_point(size = 4L)
    as.list(ggpk@ggcalls[[2]][[1]][2])
  }, {
    list(size = rlang::quo(4L))
  })
})

test_that("<ggpacket> + <ggpacket> adds ggpacket as nested ggcall", {
  expect_equal({
    ggpk <- (ggpacket() + geom_line()) + (ggpacket() + geom_line())
    ggpk@ggcalls[[1]][[1]]
  }, {
    ggpk <- (ggpacket() + geom_line())
    ggpk@ggcalls[[1]][[1]]
  })

  expect_equal({
    ggpk <- (ggpacket() + geom_line()) + (ggpacket() + geom_line())
    ggpk@ggcalls[[2]][[1]]
  }, {
    ggpk <- (ggpacket() + (ggpacket() + geom_line()))
    ggpk@ggcalls[[1]][[1]]
  })
})

test_that("<ggpacket> %+% <call> captures expressions, even if error prone", {
  expect_silent({
    ggpacket() %+% geom_line(fake_param = 1 + "a")
  })
})

test_that("%+% and + are equal aside from avoiding initial evaluation", {
  expect_equal({
    ggpacket() %+% geom_line(color = "red")
  }, {
    ggpacket() + geom_line(color = "red")
  })
})