minor #52157 [Tests] Move expectException closer to the place of the expectation to avoid false positives (OskarStark)

This PR was merged into the 6.4 branch.

Discussion
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[Tests] Move `expectException` closer to the place of the expectation to avoid false positives

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | --
| License       | MIT

If you guys like this PR, I will fix the other places as well

Should be merged after merge & upmerge of:
* #52365

Commits
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6115ab0751 [Tests] Move expectException closer to the place of the expectation to avoid false positives

Author: nicolas-grekas

Tests/Extension/HttpKernelExtensionTest.php

@@ -30,9 +30,10 @@ class HttpKernelExtensionTest extends TestCase
 {
     public function testFragmentWithError()
     {
-        $this->expectException(\Twig\Error\RuntimeError::class);
         $renderer = $this->getFragmentHandler($this->throwException(new \Exception('foo')));
 
+        $this->expectException(\Twig\Error\RuntimeError::class);
+
         $this->renderTemplate($renderer);
     }