diff --git a/tests/tools.php b/tests/tools.php
index e70346f..33baa94 100644
--- a/tests/tools.php
+++ b/tests/tools.php
@@ -106,13 +106,18 @@ function runIterations(int $iterations, $r, array $routes) {
 	$interval = $iterations / 10;
 	for ($i = 0; $i < $iterations; $i++) {
 		// pick a random route from the array
-		[$method, $uri] = $routes[array_rand($routes)];
+		[$method, $path] = $routes[array_rand($routes)];
+		// replace all :params/ with random values
+		$uri = preg_replace_callback('/:(\w+)/', function($matches) {
+			return rand(1, 100);
+		}, $path);
+		$start2 = microtime(true);
 		$res = $r->lookup($method, $uri);
 		if ($res === 404 || $res === 405) {
-			echo Color::red("Failed to handle request for $uri - $res\n");
+			echo Color::red("Failed to handle request.\n$method $res\n"."├─ URI: $uri\n├─ Path: $path\n");
 			exit(1);
 		}
-		if ($i !== 0 && $i % ($interval) === 0) echoMemoryAndTime($i, $start);
+		if ($i !== 0 && $i % ($interval) === 0) echoMemoryAndTime($i, $start2);
 	}
 	echo "Time: " . Color::cyan(number_format(microtime(true) - $start, 10) . " s\n");
 	// echo the average time per request