Added unit tests. And ran tests using

Author: moutikabdessabour

tests/testthat/_snaps/ggplot-function/geomfunction.svg

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+p <- ggplot(data = data.frame(x = 0), mapping = aes(x = x)) 
+
+test_that("ggplotly correctly handles stat_function", {
+  pl <- p + 
+    stat_function(fun = function(x) x^2+3) + 
+    xlim(1, 5)
+
+    expect_doppelganger(ggplotly(pl), "stat-function")
+})
+
+test_that("ggplotly correctly handles stat_function", {
+  pl <- p + 
+    geom_function(fun = function(x) x^2+3) + 
+    stat_function(fun = function(x) 5) + 
+    xlim(1, 5)
+
+    expect_doppelganger(ggplotly(pl), "geomfunction")
+})