feat: adds pest function

tests/Unit/Configuration/In.php

@@ -0,0 +1,9 @@
+<?php
+
+use Pest\PendingCalls\UsesCall;
+
+it('proxies to uses call', function () {
+    $in = pest()->in();
+
+    expect($in)->toBeInstanceOf(UsesCall::class);
+});

tests/Unit/Configuration/Theme.php

@@ -0,0 +1,7 @@
+<?php
+
+it('creates a theme instance', function () {
+    $theme = pest()->theme();
+
+    expect($theme)->toBeInstanceOf(Pest\Configuration\Theme::class);
+});