diff --git a/tests/testthat/test-benchmark-formatting-mock.R b/tests/testthat/test-benchmark-formatting-mock.R
new file mode 100644
index 0000000..3f43877
--- /dev/null
+++ b/tests/testthat/test-benchmark-formatting-mock.R
@@ -0,0 +1,22 @@
+test_that("benchmark time formatting function works correctly", {
+  # Create a mock environment to test the formatting function
+  format_benchmark_time <- function(time_string) {
+    if (is.character(time_string) && grepl("s$", time_string)) {
+      time_value <- as.numeric(sub("s$", "", time_string))
+      paste0(round(time_value, 2), "s")
+    } else {
+      time_string
+    }
+  }
+
+  # Test with various inputs
+  expect_equal(format_benchmark_time("3.395072759s"), "3.4s")
+  expect_equal(format_benchmark_time("0.123456s"), "0.12s")
+  expect_equal(format_benchmark_time("1.999s"), "2s")
+  expect_equal(format_benchmark_time("0.001s"), "0s")
+
+  # Test with non-matching inputs
+  expect_equal(format_benchmark_time("invalid"), "invalid")
+  expect_equal(format_benchmark_time(NULL), NULL)
+  expect_equal(format_benchmark_time(123), 123)
+})