diff --git a/docs/Unit-Test-Advice.md b/docs/Unit-Test-Advice.md
index 07af3922f1..cc46486a08 100644
--- a/docs/Unit-Test-Advice.md
+++ b/docs/Unit-Test-Advice.md
@@ -129,7 +129,7 @@ pub type Result<T> = std::result::Result<T, &'static str>;
 // Accepts a string and an integer and returns the
 // result of sticking them together separated by a dash as a string.
 fn join_params_with_dash(str: &str, num: i32) -> Result<String> {
-    if str == "" {
+    if str.is_empty() {
         return Err("string cannot be blank");
     }