Use fake composer class when the autoload file does not exist

src/Support/ComposerClassMap.php

@@ -8,15 +8,21 @@
 
 class ComposerClassMap
 {
-    /** @var \Composer\Autoload\ClassLoader */
+    /** @var \Composer\Autoload\ClassLoader|FakeComposer */
     protected $composer;
 
     /** @var string */
     protected $basePath;
 
     public function __construct(?string $autoloaderPath = null)
     {
-        $this->composer = require $autoloaderPath ?? base_path('/vendor/autoload.php');
+        $autoloaderPath = $autoloaderPath ?? base_path('/vendor/autoload.php');
+
+        if (file_exists($autoloaderPath)) {
+            $this->composer = require $autoloaderPath;
+        } else {
+            $this->composer = new FakeComposer();
+        }
         $this->basePath = app_path();
     }
 

src/Support/FakeComposer.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Facade\Ignition\Support;
+
+class FakeComposer
+{
+    public function getClassMap()
+    {
+        return [];
+    }
+
+    public function getPrefixes()
+    {
+        return [];
+    }
+
+    public function getPrefixesPsr4()
+    {
+        return [];
+    }
+}

tests/Support/ComposerClassMapTest.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Facade\Ignition\Tests\Support;
+
+use Facade\Ignition\Support\ComposerClassMap;
+use Facade\Ignition\Tests\TestCase;
+
+class ComposerClassMapTest extends TestCase
+{
+    /** @test */
+    public function it_uses_fake_classmap_if_the_autoloader_does_not_exist()
+    {
+        $classMap = new ComposerClassMap('invalid');
+
+        $this->assertSame([], $classMap->listClasses());
+        $this->assertSame([], $classMap->listClassesInPsrMaps());
+        $this->assertNull($classMap->searchClassMap('SomeClass'));
+        $this->assertNull($classMap->searchPsrMaps('SomeClass'));
+    }
+}