Add support for installing Pest into a Lumen application

This entails creating Laravel and Lumen-specific stubs, and ensuring
that the appropriate stubs are copied as part of the pest install.

src/Laravel/Commands/PestInstallCommand.php

@@ -7,6 +7,7 @@ namespace Pest\Laravel\Commands;
 use Illuminate\Console\Command;
 use Illuminate\Support\Facades\File;
 use Pest\Exceptions\InvalidConsoleArgument;
+use Pest\Support\Str;
 
 /**
  * @internal
@@ -36,6 +37,8 @@ final class PestInstallCommand extends Command
         $pest    = base_path('tests/Pest.php');
         /* @phpstan-ignore-next-line */
         $helpers = base_path('tests/Helpers.php');
+        /* @phpstan-ignore-next-line */
+        $stubs = $this->isLumen() ? 'stubs/Lumen' : 'stubs/Laravel';
 
         foreach ([$pest, $helpers] as $file) {
             if (File::exists($file)) {
@@ -45,17 +48,25 @@ final class PestInstallCommand extends Command
 
         File::copy(implode(DIRECTORY_SEPARATOR, [
             dirname(__DIR__, 3),
-            'stubs',
+            $stubs,
             'Pest.php',
         ]), $pest);
 
         File::copy(implode(DIRECTORY_SEPARATOR, [
             dirname(__DIR__, 3),
-            'stubs',
+            $stubs,
             'Helpers.php',
         ]), $helpers);
 
         $this->output->success('`tests/Pest.php` created successfully.');
         $this->output->success('`tests/Helpers.php` created successfully.');
     }
+
+    /**
+     * Determine if this is a Lumen application.
+     */
+    protected function isLumen(): bool
+    {
+        return Str::startsWith(app()->version(), 'Lumen');
+    }
 }

stubs/Lumen/Helpers.php

@@ -0,0 +1,11 @@
+<?php
+
+use Illuminate\Contracts\Auth\Authenticatable;
+
+/**
+ * Set the currently logged in user for the application.
+ */
+function actingAs(Authenticatable $user, string $driver = null): TestCase
+{
+    return test()->actingAs($user, $driver);
+}

stubs/Lumen/Pest.php

@@ -0,0 +1,3 @@
+<?php
+
+uses(TestCase::class);

stubs/Lumen/phpunit.xml

@@ -0,0 +1,17 @@
+<?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="Application Test Suite">
+            <directory suffix="Test.php">./tests</directory>
+        </testsuite>
+    </testsuites>
+    <filter>
+        <whitelist processUncoveredFilesFromWhitelist="true">
+            <directory suffix=".php">./app</directory>
+        </whitelist>
+    </filter>
+</phpunit>