add tests for directory and file patterns

tests/PHPUnit/CustomTestCase/UsesPerDirectoryAsPattern.php

@@ -0,0 +1,7 @@
+<?php
+
+uses(Tests\CustomTestCase\CustomTestCase::class)->in('../*/');
+
+test('closure was bound to CustomTestCase', function () {
+    $this->assertCustomTrue();
+});

tests/PHPUnit/CustomTestCase/UsesPerFileAsPattern.php

@@ -0,0 +1,7 @@
+<?php
+
+uses(Tests\CustomTestCase\CustomTestCase::class)->in('*.php');
+
+test('closure was bound to CustomTestCase', function () {
+    $this->assertCustomTrue();
+});