diff --git a/src/var.rs b/src/var.rs
index ea4fadd..6f822a2 100644
--- a/src/var.rs
+++ b/src/var.rs
@@ -555,15 +555,7 @@ impl GameVars {
     // and if a scope is missing, it prefixes the fallback scope.
     // Should NOT be used on non-variable values, like plain strings.
     //
-    // Some examples, assuming fallback_scope="Clippy", SCOPE_SEPARATOR="$":
-    //
-    // "" -> "clippy$"
-    // "foo" -> "clippy$foo"
-    // "FOO" -> "clippy$foo"
-    // "$foo" -> "clippy$foo"
-    // "$$foo" -> "$$foo"
-    // "PizzaClippy$foo" -> "pizzaclippy$foo" (unchanged)
-    // "$foo$foo$foo$foo" -> "$foo$foo$foo$foo" (unchanged)
+    // See test_normalize_varname() for examples.
     pub fn normalize_varname(fallback_scope: &str, key: &str) -> String {
         let parts: Vec<&str> = key.split(SCOPE_SEPARATOR).collect();
         let key: String = if parts.len() == 1 {
@@ -695,6 +687,17 @@ impl GameVars {
     }
 }
 
+#[test]
+fn test_normalize_varname() {
+    assert_eq!(GameVars::normalize_varname("Clippy", ""), "clippy$");
+    assert_eq!(GameVars::normalize_varname("Clippy", "foo"), "clippy$foo");
+    assert_eq!(GameVars::normalize_varname("Clippy", "FOO"), "clippy$foo");
+    assert_eq!(GameVars::normalize_varname("Clippy", "$foo"), "clippy$foo");
+    assert_eq!(GameVars::normalize_varname("Clippy", "$$foo"), "$$foo");
+    assert_eq!(GameVars::normalize_varname("Clippy", "PizzaClippy$foo"), "pizzaclippy$foo");
+    assert_eq!(GameVars::normalize_varname("Clippy", "$foo$foo$foo$foo"), "$foo$foo$foo$foo");
+}
+
 #[derive(Resource, Default)]
 pub struct CommandLineOptions {
     pub window_mode_fullscreen: WindowMode,