Better way to check for tensorflow (#53)

* New way to check for tensorflow

* Revert "New way to check for tensorflow"

This reverts commit 10475ad.

* Let's just skip on CRAN

* More skipping without tensorflow

* Remove extra `prep()`

Author: juliasilge

tests/testthat/test_bundle_embed.R

@@ -1,11 +1,11 @@
 test_that("bundling + unbundling step_umap", {
+  skip_on_cran()
   skip_if_not_installed("embed")
   skip_if_not_installed("butcher")
+  skip_if(is.null(tensorflow::tf_version()))
 
   library(embed)
 
-  skip_if_not(is_tf_available())
-
   # define a function to prep a recipe ------------------------------------------
   prep_rec <- function() {
     set.seed(1)

tests/testthat/test_bundle_keras.R

@@ -1,4 +1,5 @@
 test_that("bundling + unbundling keras fits", {
+  skip_on_cran()
   skip_if_not_installed("keras")
   skip_if_not_installed("butcher")
   skip_if(is.null(tensorflow::tf_version()))

tests/testthat/test_bundle_workflows.R

@@ -123,20 +123,20 @@ test_that("bundling + unbundling tidymodels workflows (xgboost + step_log)", {
 })
 
 test_that("bundling + unbundling tidymodels workflows (lm + step_umap)", {
+  skip_on_cran()
   skip_if_not_installed("workflows")
   skip_if_not_installed("parsnip")
   skip_if_not_installed("recipes")
   skip_if_not_installed("embed")
   skip_if_not_installed("butcher")
+  skip_if(is.null(tensorflow::tf_version()))
 
   library(workflows)
   library(parsnip)
   library(recipes)
   library(embed)
   library(butcher)
 
-  skip_if_not(is_tf_available())
-
   # define a function to fit a model -------------------------------------------
   fit_model <- function() {
     set.seed(1)