diff --git a/.github/workflows/check-test-warnings.yaml b/.github/workflows/check-test-warnings.yaml
index 4f10ed7..683b977 100644
--- a/.github/workflows/check-test-warnings.yaml
+++ b/.github/workflows/check-test-warnings.yaml
@@ -37,7 +37,11 @@ jobs:
 
       - name: Run Tests
         run: |
-          options(crayon.enabled = TRUE, warn = 2L)
-          # testthat::test_dir("tests")
-          devtools::test()
+            pkgload::load_all()
+            test_script_paths <- testthat::find_test_scripts("tests/testthat")
+            test_with_warning_as_error <- function(...) {
+              withr::local_options(list(warn = 2L))
+              testthat::test_file(...)
+            }
+            purrr::walk(test_script_paths, test_with_warning_as_error)
         shell: Rscript {0}