diff --git a/tests/testthat/test-check.R b/tests/testthat/test-check.R
index 63928f61..4b598dd4 100644
--- a/tests/testthat/test-check.R
+++ b/tests/testthat/test-check.R
@@ -4,6 +4,13 @@ test_that(
  desc = 'errors trigger on cue',
  code = {
 
+  expect_error(
+   check_arg_uni(uni = c('a', 'b', 'd'),
+                 arg_name = 'ok',
+                 expected_uni = c('a', 'b', 'c')),
+   regexp = 'should contain'
+  )
+
   expect_error(
    check_arg_is_integer(arg_name = 'x',
                         arg_value = c(1, 2, 3.3)),
diff --git a/tests/testthat/test-orsf_vs.R b/tests/testthat/test-orsf_vs.R
index c3bd5fce..0c4e52dd 100644
--- a/tests/testthat/test-orsf_vs.R
+++ b/tests/testthat/test-orsf_vs.R
@@ -1,5 +1,4 @@
 
-
 test_that(
  desc = "variable selection filters junk preds",
  code = {
@@ -10,10 +9,16 @@ test_that(
 
   junk_names <- paste("junk", seq(n_junk_preds), sep ='_')
 
+  set.seed(329)
+
   for(i in junk_names)
    pbc_with_junk[[i]] <- rnorm(nrow(pbc))
 
-  fit <- orsf(pbc_with_junk, time + status ~ ., n_tree = 50)
+  fit <- orsf(pbc_with_junk,
+              time + status ~ .,
+              n_tree = 75,
+              importance = 'permute',
+              tree_seeds = seeds_standard)
 
   fit_var_select <- orsf_vs(fit, n_predictor_min = 10)