improve integration tests

Make mock of Composer more realistic:
- ./vendor/autoload.php actually requires ./composer/autoload_real.php
- \Composer\InstalledVersions actually depends on installed.php
- installed.php contents is closer to real life

Author: lavarou

tests/integration/autoloader/autoload-with-composer/vendor/autoload.php

@@ -9,4 +9,4 @@
 The agent verifies its presence to determine if PSR-4 Autoloader is used.
 */
 
-echo "";
+require_once __DIR__ . '/composer/autoload_real.php';

tests/integration/autoloader/autoload-with-composer/vendor/composer/InstalledVersions.php

@@ -12,28 +12,34 @@
 namespace Composer;
 class InstalledVersions
 {
-    // Mocked data: installed packages and their versions
-    private static $installed = [
-        'vendor1/package1' => '1.1.3',
-        'vendor2/package2' => '2.1.5'
-    ];
-
     // This Composer's runtime API method is used by the agent to get the installed version of a package:
     public static function getVersion(string $packageName)
     {
-        return self::$installed[$packageName];
+        $installed = self::getAllRawData();
+        return $installed[0]['versions'][$packageName]['version'];
     }
 
     // This Composer's runtime API method is used by the agent to get the list of installed packages:
     public static function getInstalledPackages()
     {
         // Return the package names
-        return array_keys(self::$installed);
+        $installed = self::getAllRawData();
+        return array_keys($installed[0]['versions']);
+    }
+
+    // This Composer's runtime API method is used by the agent to get the list of installed packages:
+    public static function getAllRawData()
+    {
+        $installed = require __DIR__ . '/installed.php';
+        // This mock only returns a single dataset; in real life, there could be more
+        return array($installed);
     }
 
     // Mock of 'composer show' used by integration tests to generate list of packages:
     public static function show() {
-        foreach (self::$installed as $package => $version) {
+        $installed = self::getAllRawData();
+        foreach ($installed[0]['versions'] as $package => $info) {
+            $version = ltrim($info['pretty_version'], 'v');
             echo "$package => $version\n";
         }
     }

tests/integration/autoloader/autoload-with-composer/vendor/composer/installed.php

@@ -6,6 +6,26 @@
 
 /*DESCRIPTION
 This file is needed by real Composer's runtime API, and agent verifies its presence to determine if Composer is used.
-Therefore, even though mocked version of Composer's runtime API does not use this file but (and that's why its empty),
-it still needs to be present.
+This file contains phpized version of composer.json for the project and its dependencies.
 */
+  return array(
+    // Mocked data: root package
+    'root' => array(
+        'pretty_version' => 'v1.0.0',
+        'version' => '1.0.0.0',
+        'type' => 'project'
+    ),
+    // Mocked data: installed packages and their versions
+    'versions' =>  array(
+        'vendor1/package1' => array(
+            'pretty_version' => 'v1.1.3',
+            'version' => '1.1.3.0',
+            'type' => 'library'
+        ),
+        'vendor2/package2' => array(
+            'pretty_version' => '2.1.5',
+            'version' => '2.1.5.0',
+            'type' => 'library'
+            )
+    )
+  );