Check for tibble package before using it on tests (#971)

Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>

tests/testthat.R

@@ -1,2 +1,5 @@
-library(testthat)
-test_check("rtables", reporter = "check")
+if (requireNamespace("testthat", quietly = TRUE)) {
+  library(testthat)
+  library(rtables)
+  test_check("rtables", reporter = "check")
+}

tests/testthat/test-default_split_funs.R

@@ -249,6 +249,9 @@ test_that("drop_and_remove_levels also works with character variables", {
 })
 
 test_that("trim_levels_to_map split function works", {
+  skip_if_not_installed("tibble")
+  require(tibble, quietly = TRUE)
+
   map <- data.frame(
     LBCAT = c("CHEMISTRY", "CHEMISTRY", "CHEMISTRY", "IMMUNOLOGY"),
     PARAMCD = c("ALT", "CRP", "CRP", "IGA"),

tests/testthat/test-lyt-tabulation.R

@@ -237,6 +237,9 @@ test_that("labelkids parameter works", {
 
 
 test_that("ref_group comparisons work", {
+  skip_if_not_installed("tibble")
+  require(tibble, quietly = TRUE)
+
   blthing <- basic_table() %>%
     split_cols_by("ARM", ref_group = "ARM1") %>%
     analyze("AGE", show_labels = "hidden") %>%

tests/testthat/test-printing.R

@@ -801,6 +801,9 @@ test_that("horizontal separator is propagated from table to print and export", {
 ## higher-level showing ncols works:
 
 test_that("showing higher-level ncols works", {
+  skip_if_not_installed("tibble")
+  require(tibble, quietly = TRUE)
+
   mydat <- subset(ex_adsl, SEX %in% c("M", "F"))
   mydat$SEX2 <- factor(
     ifelse(

tests/testthat/test-subset-access.R

@@ -136,6 +136,9 @@ test_rowpaths <- function(tt, visonly = TRUE) {
 
 
 test_that("make_row_df, make_col_df give paths which all work", {
+  skip_if_not_installed("tibble")
+  require(tibble, quietly = TRUE)
+
   lyt <- basic_table() %>%
     split_cols_by("ARM") %>%
     split_cols_by("SEX", ref_group = "F") %>%