diff --git a/blog/content/edition-2/posts/04-testing/index.fa.md b/blog/content/edition-2/posts/04-testing/index.fa.md
index 2e065c56b..a8bc545d1 100644
--- a/blog/content/edition-2/posts/04-testing/index.fa.md
+++ b/blog/content/edition-2/posts/04-testing/index.fa.md
@@ -77,7 +77,7 @@ error[E0463]: can't find crate for `test`
 #![test_runner(crate::test_runner)]
 
 #[cfg(test)]
-fn test_runner(tests: &[&dyn Fn()]) {
+pub fn test_runner(tests: &[&dyn Fn()]) {
     println!("Running {} tests", tests.len());
     for test in tests {
         test();
diff --git a/blog/content/edition-2/posts/04-testing/index.ja.md b/blog/content/edition-2/posts/04-testing/index.ja.md
index 6f8837f58..8a1d0100a 100644
--- a/blog/content/edition-2/posts/04-testing/index.ja.md
+++ b/blog/content/edition-2/posts/04-testing/index.ja.md
@@ -81,7 +81,7 @@ error[E0463]: can't find crate for `test`
 #![test_runner(crate::test_runner)]
 
 #[cfg(test)]
-fn test_runner(tests: &[&dyn Fn()]) {
+pub fn test_runner(tests: &[&dyn Fn()]) {
     println!("Running {} tests", tests.len());
     for test in tests {
         test();
diff --git a/blog/content/edition-2/posts/04-testing/index.md b/blog/content/edition-2/posts/04-testing/index.md
index 94b8d4ec6..fa34ac75b 100644
--- a/blog/content/edition-2/posts/04-testing/index.md
+++ b/blog/content/edition-2/posts/04-testing/index.md
@@ -73,7 +73,7 @@ To implement a custom test framework for our kernel, we add the following to our
 #![test_runner(crate::test_runner)]
 
 #[cfg(test)]
-fn test_runner(tests: &[&dyn Fn()]) {
+pub fn test_runner(tests: &[&dyn Fn()]) {
     println!("Running {} tests", tests.len());
     for test in tests {
         test();
diff --git a/blog/content/edition-2/posts/04-testing/index.zh-CN.md b/blog/content/edition-2/posts/04-testing/index.zh-CN.md
index a343d67a3..6471a265f 100644
--- a/blog/content/edition-2/posts/04-testing/index.zh-CN.md
+++ b/blog/content/edition-2/posts/04-testing/index.zh-CN.md
@@ -75,7 +75,7 @@ error[E0463]: can't find crate for `test`
 #![test_runner(crate::test_runner)]
 
 #[cfg(test)]
-fn test_runner(tests: &[&dyn Fn()]) {
+pub fn test_runner(tests: &[&dyn Fn()]) {
     println!("Running {} tests", tests.len());
     for test in tests {
         test();