test_that("move_node", {

library(lavaan)
library(semPlot)

mod_pa <-
 'x1 ~~ x2
  x3 ~  x1 + x2
  x4 ~  x1 + x3
 '
fit_pa <- lavaan::sem(mod_pa, pa_example)

m <- matrix(c("x1",   NA,  NA,   NA,
                NA, "x3",  NA, "x4",
              "x2",   NA,  NA,   NA), byrow = TRUE, 3, 4)
p_pa <- semPaths(fit_pa, whatLabels = "est",
           sizeMan = 10,
           edge.label.cex = 1.15,
           nCharNodes = 0, nCharEdges = 0,
           layout = m, DoNotPlot = TRUE)
# plot(p_pa)

my_move_by <- list(x3 = c(0, -.5),
                   x4 = c(-.25, .5))

p1 <- move_node(p_pa,
                my_move_by)

# plot(p1)

chk0 <- p_pa$layout
chk1 <- p1$layout

expect_equal(chk0[1, ] - chk1[1, ],
             c(0, 0.5))
expect_equal(chk0[2, ] - chk1[2, ],
             c(0.25, -.5))

my_move_by <- list(x2 = c(x = .5),
                   x1 = c(y = -.25),
                   x3 = c(y = .5, x = .5))

p1 <- move_node(p_pa,
                my_move_by)

# plot(p1)

chk0 <- p_pa$layout
chk1 <- p1$layout

expect_equal(chk0[1, ] - chk1[1, ],
             c(-0.5, -0.5))
expect_equal(chk0[3, ] - chk1[3, ],
             c(0, .25))
expect_equal(chk0[4, ] - chk1[4, ],
             c(-.5, 0))

})