remove unnecessary custom phpunit xml added previously

tests/Fixtures/phpunit-parallel-inheritance.xml

@@ -1,13 +0,0 @@
-<?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>

tests/Visual/Parallel.php

@@ -23,6 +23,5 @@ test('parallel', function () use ($run) {
 })->skip(PHP_OS_FAMILY === 'Windows');
 
 test('a parallel test can extend another test with same name', function () use ($run) {
-    expect($run('--configuration=tests/Fixtures/phpunit-parallel-inheritance.xml'))
-        ->toContain('1 passed');
+    expect($run('tests/Fixtures/Inheritance'))->toContain('Tests:    1 skipped, 1 passed (1 assertions)');
 });