diff --git a/tests/testthat/test-admiral_options.R b/tests/testthat/test-admiral_options.R
index 241459d9a0..c89050f158 100644
--- a/tests/testthat/test-admiral_options.R
+++ b/tests/testthat/test-admiral_options.R
@@ -18,7 +18,7 @@ test_that("get_admiral_option Test 3: non-character argument triggers assertion
 })
 
 # set_admiral_options ----
-## Test 4: set works ----
+## Test 4: set subject_keys works ----
 test_that("set_admiral_options Test 4: set works", {
   set_admiral_options(subject_keys = exprs(STUDYID, USUBJID2))
   expect_equal(get_admiral_option("subject_keys"), exprs(STUDYID, USUBJID2))
@@ -35,4 +35,26 @@ test_that("set_admiral_options Test 5: unexpected function input for set gives e
     class = "assert-admiraldev"
   )
 })
+
+## Test 6: non-positive numeric argument triggers assertion error ----
+test_that("get_admiral_option Test 6: non-positive numeric argument triggers assertion error", {
+  sigfigs <- 0
+  expect_error(
+    set_admiral_options(signif_digits = sigfigs),
+    class = "assert_integer_scalar"
+  )
+  sigfigs <- -1
+  expect_error(
+    set_admiral_options(signif_digits = sigfigs),
+    class = "assert_integer_scalar"
+  )
+})
+
+## Test 7: set signif_digits works ----
+test_that("set_admiral_options Test 7: set works", {
+  sigfigs <- get_admiral_option("signif_digits")
+  set_admiral_options(signif_digits = sigfigs + 1)
+  expect_equal(get_admiral_option("signif_digits"), sigfigs + 1)
+  set_admiral_options(signif_digits = sigfigs)
+})
 set_admiral_options(subject_keys = exprs(STUDYID, USUBJID))