feat: inline testing

src/NotExported/MyTestCase.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\NotExported;
+
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @internal
+ */
+class MyTestCase extends TestCase // @phpstan-ignore-line
+{
+    public function assertIsTestable(string $testable): void
+    {
+        static::assertSame(MyTestableClass::class, $testable);
+    }
+}

src/NotExported/MyTestableClass.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\NotExported;
+
+/**
+ * @internal
+ */
+final class MyTestableClass
+{
+    public function foo(): void
+    {
+        // ...
+    }
+}
+
+it('foo', function () {
+    $testable = new MyTestableClass();
+
+    $this->assertIsTestable(get_class($testable)); // @phpstan-ignore-line
+});

src/Plugin.php

@@ -23,7 +23,7 @@ final class Plugin
     public static function uses(string ...$traits): void
     {
         self::$callables[] = function () use ($traits): void {
-            uses(...$traits)->in(TestSuite::getInstance()->rootPath.DIRECTORY_SEPARATOR.testDirectory());
+            uses(...$traits)->in(TestSuite::getInstance()->rootPath);
         };
     }
 }