Simplify $_composer_autoload_path fallback cases

The `Codeception\Codecept` class will always give us the location of the vendor dir,
even during wp-browser development or if a consumer project has moved it.
(Thank you, @lucatume, for the suggestion.)

Unit test simplified as we don't need the tedious dir traversal anymore — the
single fallback test will detect any problems if `Codecept` moves.

src/Utils/Composer.php

@@ -4,6 +4,7 @@
 
 namespace lucatume\WPBrowser\Utils;
 
+use Codeception\Codecept;
 use JsonException;
 use lucatume\WPBrowser\Adapters\Symfony\Component\Process\Process;
 use lucatume\WPBrowser\Exceptions\RuntimeException;
@@ -37,14 +38,13 @@ public static function autoloadPath(): string
          */
         global $_composer_autoload_path;
         if (isset($_composer_autoload_path)) {
-            $autoload_path = $_composer_autoload_path;
-        } elseif (is_dir(codecept_root_dir('vendor'))) {
-            $autoload_path = codecept_root_dir('vendor') . DIRECTORY_SEPARATOR . 'autoload.php';
+            $autoloadPath = $_composer_autoload_path;
         } else {
-            // vendor-dir was renamed, try our best to find the right directory based on where wp-browser is installed
-            $autoload_path = dirname(__FILE__, 5) . DIRECTORY_SEPARATOR . 'autoload.php';
+            // we use the Codecept class to find the location of Composer's vendor-dir, even if a project has renamed it
+            $vendorDir = dirname((string)(new \ReflectionClass(Codecept::class))->getFilename(), 5);
+            $autoloadPath = $vendorDir . DIRECTORY_SEPARATOR . 'autoload.php';
         }
-        return realpath($autoload_path) ?: $autoload_path;
+        return realpath($autoloadPath) ?: $autoloadPath;
     }
 
     public static function binDir(?string $path = null): string

tests/unit/lucatume/WPBrowser/Utils/ComposerTest.php

@@ -233,7 +233,7 @@ public function static_autoload_path_should_return_global_composer_autoload_path
     }
 
     /**
-     * The `autoloadPath` static method should return a best-guess fallback if the global `$_composer_autoload_path` is undefined
+     * The `autoloadPath` static method should find the autoload.php file itself if the global `$_composer_autoload_path` is undefined
      *
      * @test
      * @backupGlobals enabled
@@ -249,34 +249,4 @@ public function static_autoload_path_should_use_fallback(): void
         $this->assertSame(codecept_root_dir() . 'vendor/autoload.php', $autoloadPath );
         $this->assertFileExists( $autoloadPath );
     }
-
-    /**
-     * The `autoloadPath` static method should still return a best-guess fallback for `$_composer_autoload_path`
-     * if Composer's vendor-dir was renamed.
-     *
-     * @test
-     * @backupGlobals enabled
-     */
-    public function static_autoload_path_should_use_fallback_if_vendor_dir_renamed_or_missing(): void
-    {
-        global $_composer_autoload_path;
-        // clear value to enable fallback
-        unset($GLOBALS['_composer_autoload_path']);
-        // pretend that wp-browser's own vendor dir does not exist
-        $this->setFunctionReturn('is_dir', false );
-
-        // The method has to find the renamed vendor-dir by directory traversal.
-        // i.e. if wp-browser is installed in `project/pkgs/lucatume/wp-browser`, find the `project/pkgs` dir.
-        // Let's figure out how far it has to go:
-        $mockVendorDir = dirname(codecept_root_dir(), 2);
-        $pathToClass = (new \ReflectionClass(Composer::class))->getFileName();
-        $relPathToVendorDir = substr($pathToClass, strlen($mockVendorDir));
-
-        $this->assertSame(5,
-            // counting directory levels
-            substr_count($relPathToVendorDir, '/'),
-            "The method is hardcoded to look 5 levels up for the parent project's vendor-dir. If this test fails, the class has moved."
-        );
-        $this->assertSame( dirname( $pathToClass, 5 ) . '/autoload.php', Composer::autoloadPath() );
-    }
 }