diff --git a/R/serocalculator_example.R b/R/serocalculator_example.R
index 357b6c58..d07917f1 100644
--- a/R/serocalculator_example.R
+++ b/R/serocalculator_example.R
@@ -16,8 +16,8 @@
 #' serocalculator_example("example_pop_data.csv")
 serocalculator_example <- function(file = NULL) {
   if (is.null(file)) {
-    dir(system.file("extdata", package = "serocalculator"))
+    dir(fs::path_package("extdata", package = "serocalculator"))
   } else {
-    system.file("extdata", file, package = "serocalculator", mustWork = TRUE)
+    fs::path_package("extdata", file, package = "serocalculator")
   }
 }
diff --git a/tests/testthat/test-serocalculator_example.R b/tests/testthat/test-serocalculator_example.R
index 8849056e..344e4dfb 100644
--- a/tests/testthat/test-serocalculator_example.R
+++ b/tests/testthat/test-serocalculator_example.R
@@ -1,3 +1,14 @@
-test_that("multiplication works", {
-  expect_equal(2 * 2, 4)
+test_that("`serocalculator_example()` works", {
+
+  path1 = serocalculator_example("example_pop_data.csv")
+  path2 = fs::path_package(package = "serocalculator",
+                           "extdata/example_pop_data.csv")
+  expect_equal(path1, path2)
+
+
+  files1 = serocalculator_example()
+  files2 = "example_pop_data.csv"
+
+  expect_equal(files1, files2)
+
 })