diff --git a/tests/testthat/_snaps/config.md b/tests/testthat/_snaps/config.md
index 2a5d61487..0374055e7 100644
--- a/tests/testthat/_snaps/config.md
+++ b/tests/testthat/_snaps/config.md
@@ -1,3 +1,21 @@
+# config_pluck_character generates informative error
+
+    Code
+      config_pluck_character(pkg, "x")
+    Condition
+      Error:
+      ! x must be a character vector, not the number 1.
+      i Edit _pkgdown.yml to fix the problem.
+
+# config_pluck_string generates informative error
+
+    Code
+      config_pluck_string(pkg, "x")
+    Condition
+      Error:
+      ! x must be a string, not the number 1.
+      i Edit _pkgdown.yml to fix the problem.
+
 # config_check_list gives informative errors
 
     Code
@@ -14,12 +32,3 @@
       1 missing component: "z".
       i Edit _pkgdown.yml to fix the problem.
 
-# config_pluck_character generates informative error
-
-    Code
-      config_pluck_character(pkg, "x")
-    Condition
-      Error:
-      ! x must be a character vector, not the number 1.
-      i Edit _pkgdown.yml to fix the problem.
-
diff --git a/tests/testthat/test-config.R b/tests/testthat/test-config.R
index 453641c75..1e38b5961 100644
--- a/tests/testthat/test-config.R
+++ b/tests/testthat/test-config.R
@@ -1,8 +1,9 @@
 
 test_that("config_pluck_character coerces empty values to character", {
-  pkg <- local_pkgdown_site(meta = list(x = NULL))
+  pkg <- local_pkgdown_site(meta = list(x = NULL, y = list()))
   expect_equal(config_pluck_character(pkg, "x"), character())
   expect_equal(config_pluck_character(pkg, "y"), character())
+  expect_equal(config_pluck_character(pkg, "z"), character())
 })
 
 test_that("config_pluck_character generates informative error", {
@@ -10,6 +11,11 @@ test_that("config_pluck_character generates informative error", {
   expect_snapshot(config_pluck_character(pkg, "x"), error = TRUE)
 })
 
+test_that("config_pluck_string generates informative error", {
+  pkg <- local_pkgdown_site(meta = list(x = 1))
+  expect_snapshot(config_pluck_string(pkg, "x"), error = TRUE)
+})
+
 # checkers --------------------------------------------------------------------
 
 test_that("config_check_list() returns list if ok", {