R Under development (unstable) (2024-02-05 r85863 ucrt) -- "Unsuffered Consequences"
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> # Tests for coercion functions.
> 
> library(pcalg)
> 
> # Tests for coercion functions of EssGraph objects.
> set.seed(123)
> 
> for (i in 1:10) {
+   # Test that a CPDAG can be coerced to an EssGraph object and back.
+   dag <- randomDAG(10, 0.3)
+   cpdag <- dag2cpdag(dag)
+   essgraph <- as(cpdag, "EssGraph")
+   cpdag2 <- as(essgraph, "graphNEL")
+ 
+   if (!all.equal(cpdag, cpdag2)) {
+     stop("Original and coerced CPDAG are not equal.")
+   }
+ }
> 
> proc.time()
   user  system elapsed 
   1.04    0.14    1.17