[6.x] Update composer tests

.github/workflows/tests.yml

@@ -37,17 +37,16 @@ jobs:
         uses: tj-actions/changed-files@v46
         with:
           files: |
-            config
-            lang
-            resources/users
-            resources/views
-            routes
-            src
-            tests
+            config/**
+            lang/**
+            resources/users/**
+            resources/views/**
+            routes/**
+            src/**
+            tests/**
             composer.json
             phpunit.xml.dist
             .github/workflows/tests.yml
-            tests/Composer/__fixtures__
             **.php
 
       - name: Determine whether tests should run

src/Console/Processes/Composer.php

@@ -64,7 +64,7 @@ public function installed()
             return collect();
         }
 
-        return collect($this->runJsonComposerCommand('show', '--direct', '--no-plugins')->installed)
+        return collect($this->runJsonComposerCommand('show', '--direct', '--no-plugins')?->installed ?? [])
             ->keyBy('name')
             ->map(function ($package) use ($lock) {
                 $package->version = $this->normalizeVersion($package->version);
@@ -99,7 +99,7 @@ public function installedVersion(string $package)
      */
     public function installedPath(string $package)
     {
-        return collect($this->runJsonComposerCommand('show', '--direct', '--path', '--no-plugins')->installed)
+        return collect($this->runJsonComposerCommand('show', '--direct', '--path', '--no-plugins')?->installed ?? [])
             ->keyBy('name')
             ->get($package)
             ->path;

tests/Composer/ComposerTest.php

@@ -93,11 +93,6 @@ public function it_can_get_installed_path_of_a_package()
             __DIR__.'/__fixtures__/vendor/statamic/composer-test-example-dependency',
             Composer::installedPath('statamic/composer-test-example-dependency')
         );
-
-        $this->assertEquals(
-            __DIR__.'/__fixtures__/vendor/composer/composer',
-            Composer::installedPath('composer/composer')
-        );
     }
 
     #[Group('integration')]
@@ -224,9 +219,6 @@ public function it_can_require_and_remove_multiple_packages_in_one_shot()
         PackToTheFuture::generateComposerJson('test/two', '2.0.0', [], $this->basePath('tmp/two/composer.json'));
 
         $repositories = [
-            'require' => [
-                'composer/composer' => '^2.0.0',
-            ],
             'repositories' => [
                 ['type' => 'path', 'url' => $this->basePath('tmp/one'), 'options' => ['symlink' => false]],
                 ['type' => 'path', 'url' => $this->basePath('tmp/two'), 'options' => ['symlink' => false]],

tests/Composer/__fixtures__/composer.json

@@ -1,7 +1,6 @@
 {
     "name": "statamic/composer-test",
     "require": {
-        "composer/composer": "^2.2.12",
         "statamic/composer-test-example-dependency": "1.2.3"
     },
     "require-dev": {