minor #26002 Improve assertions (carusogabriel)

This PR was merged into the 3.4 branch.

Discussion
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Improve assertions

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Following #25420 in `3.4` branch.

Commits
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829f59d Improve assertions

Author: nicolas-grekas

Tests/RouteCollectionBuilderTest.php

@@ -357,7 +357,7 @@ public function testAddsThePrefixOnlyOnceWhenLoadingMultipleCollections()
         $routeCollectionBuilder->import('/directory/recurse/*', '/other/', 'glob');
         $routes = $routeCollectionBuilder->build()->all();
 
-        $this->assertEquals(2, count($routes));
+        $this->assertCount(2, $routes);
         $this->assertEquals('/other/a', $routes['a']->getPath());
         $this->assertEquals('/other/b', $routes['b']->getPath());
     }