fix parallel execution of test class that inherit other class with the same name

tests/Fixtures/Inheritance/Base/ExampleTest.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Tests\Fixtures\Inheritance\Base;
+
+use PHPUnit\Framework\TestCase;
+
+class ExampleTest extends TestCase
+{
+    public function testExample()
+    {
+        $this->markTestSkipped();
+    }
+}

tests/Fixtures/Inheritance/ExampleTest.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace Tests\Fixtures\Inheritance;
+
+class ExampleTest extends Base\ExampleTest
+{
+    public function testExample()
+    {
+        $this->assertTrue(true);
+    }
+}

tests/Fixtures/phpunit-parallel-inheritance.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="../../vendor/phpunit/phpunit/phpunit.xsd"
+         bootstrap="../../vendor/autoload.php"
+         colors="true"
+>
+    <testsuites>
+        <testsuite name="Parallel Inheritance">
+            <directory suffix="Test.php">./Inheritance</directory>
+            <exclude>./Inheritance/Base</exclude>
+        </testsuite>
+    </testsuites>
+</phpunit>