Enable parallel testing (#1412)

For me, this takes run time down from ~30s to ~11s.

DESCRIPTION

@@ -54,6 +54,7 @@ VignetteBuilder:
     knitr
 Config/Needs/website: tidyverse/tidytemplate
 Config/testthat/edition: 3
+Config/testthat/parallel: TRUE 
 Encoding: UTF-8
 Language: en-gb
 Roxygen: {library(tidyr); list(markdown = TRUE)}

tests/testthat/test-verb-filter.R

@@ -151,6 +151,7 @@ test_that("filter isn't inlined after mutate with window function #1135", {
 # .by -------------------------------------------------------------------------
 
 test_that("can group transiently using `.by`", {
+  suppressWarnings(check_na_rm(FALSE))
   df <- memdb_frame(g = c(1, 1, 2, 1, 2), x = c(5, 10, 1, 2, 3))
 
   out <- filter(df, x > mean(x), .by = g) %>%

tests/testthat/test-verb-group_by.R

@@ -110,6 +110,8 @@ test_that("group_by mutate is not optimised away", {
 # sql_build ---------------------------------------------------------------
 
 test_that("ungroup drops PARTITION BY", {
+  suppressWarnings(check_na_rm(FALSE))
+
   out <- lazy_frame(x = 1) %>%
     group_by(x) %>%
     ungroup() %>%

tests/testthat/test-verb-mutate.R

@@ -212,6 +212,7 @@ test_that("empty mutate returns input", {
 # .by -------------------------------------------------------------------------
 
 test_that("can group transiently using `.by`", {
+  suppressWarnings(check_na_rm(FALSE))
   df <- memdb_frame(g = c(1, 1, 2, 1, 2), x = c(5, 2, 1, 2, 3))
 
   out <- mutate(df, x = mean(x), .by = g) %>%

tests/testthat/test-verb-pivot-wider.R

@@ -231,6 +231,7 @@ test_that("known bug - building a wider spec with a zero row data frame loses `v
 # non-unique keys ---------------------------------------------------------
 
 test_that("values_fn can be a single function", {
+  suppressWarnings(check_na_rm(FALSE))
   df <- lazy_frame(a = c(1, 1, 2), key = c("x", "x", "x"), val = c(1, 10, 100))
 
   expect_snapshot(