feat: adds fixture

tests/Features/Fixture.php

@@ -0,0 +1,11 @@
+<?php
+
+it('may return a file path', function () {
+    $file = fixture('phpunit-in-isolation.xml');
+
+    expect($file)->toBeString()
+        ->toBeFile();
+});
+
+it('may throw an exception if the file does not exist', function () {
+    fixture('file-that-does-not-exist.php');