fix: add suffix to test files

Without this, all php files at tests folder will be executed by PHPUnit as a
test file, but we have files that isn't test classes inside this folder.

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

phpunit.xml

@@ -5,7 +5,7 @@
 
     <testsuites>
         <testsuite name="Units Test">
-            <directory suffix=".php">./tests</directory>
+            <directory suffix="Test.php">./tests</directory>
         </testsuite>
     </testsuites>