diff --git a/tests/Composer/Test/Command/InstallCommandTest.php b/tests/Composer/Test/Command/InstallCommandTest.php
index e5983cc07..8787de889 100644
--- a/tests/Composer/Test/Command/InstallCommandTest.php
+++ b/tests/Composer/Test/Command/InstallCommandTest.php
@@ -18,15 +18,14 @@ use Generator;
 class InstallCommandTest extends TestCase
 {
     /**
-     * @dataProvider useCaseProvider
+     * @dataProvider errorCaseProvider
      * @param array<mixed> $composerJson
      * @param array<mixed> $command
      */
-    public function testInstallCommand(
+    public function testInstallCommandErrors(
         array $composerJson,
         array $command,
-        string $expected,
-        bool $lock = false
+        string $expected
     ): void {
         $this->initTempComposer($composerJson);
 
@@ -37,10 +36,7 @@ class InstallCommandTest extends TestCase
             self::getPackage('vendor/devpackage', '2.3.4'),
         ];
 
-        if ($lock) {
-            $this->createComposerLock($packages, $devPackages);
-        }
-
+        $this->createComposerLock($packages, $devPackages);
         $this->createInstalledJson($packages, $devPackages);
 
         $appTester = $this->getApplicationTester();
@@ -49,29 +45,11 @@ class InstallCommandTest extends TestCase
         $this->assertSame(trim($expected), trim($appTester->getDisplay(true)));
     }
 
-    public function useCaseProvider(): Generator
+    public function errorCaseProvider(): Generator
     {
         yield 'it writes an error when the dev flag is passed' => [
             [
-                'repositories' => [
-                    'packages' => [
-                        'type' => 'package',
-                        'package' => [
-                            [
-                                'name' => 'vendor/package',
-                                'description' => 'generic description',
-                                'version' => '1.0.0',
-                                'dist' => [
-                                    'url' =>  'https://example.org',
-                                    'type' => 'zip'
-                                ]
-                            ],
-                        ]
-                    ]
-                ],
-                'require' => [
-                    'vendor/package' => '^1.0'
-                ]
+                'repositories' => [],
             ],
             ['--dev' => true],
             <<<OUTPUT
@@ -81,31 +59,11 @@ Verifying lock file contents can be installed on current platform.
 Nothing to install, update or remove
 Generating autoload files
 OUTPUT
-            ,
-            true
         ];
 
         yield 'it writes an error when no-suggest flag passed' => [
             [
-                'repositories' => [
-                    'packages' => [
-                        'type' => 'package',
-                        'package' => [
-                            [
-                                'name' => 'vendor/package',
-                                'description' => 'generic description',
-                                'version' => '1.0.0',
-                                'dist' => [
-                                    'url' =>  'https://example.org',
-                                    'type' => 'zip'
-                                ]
-                            ],
-                        ]
-                    ]
-                ],
-                'require' => [
-                    'vendor/package' => '^1.0'
-                ]
+                'repositories' => [],
             ],
             ['--no-suggest' => true],
             <<<OUTPUT
@@ -115,68 +73,112 @@ Verifying lock file contents can be installed on current platform.
 Nothing to install, update or remove
 Generating autoload files
 OUTPUT
-            ,
-            true
         ];
 
         yield 'it writes an error when packages passed' => [
             [
-                'repositories' => [
-                    'packages' => [
-                        'type' => 'package',
-                        'package' => [
-                            [
-                                'name' => 'vendor/package',
-                                'description' => 'generic description',
-                                'version' => '1.0.0',
-                                'dist' => [
-                                    'url' =>  'https://example.org',
-                                    'type' => 'zip'
-                                ]
-                            ],
-                        ]
-                    ]
-                ],
-                'require' => [
-                    'vendor/package' => '^1.0'
-                ]
+                'repositories' => [],
             ],
             ['packages' => ['vendor/package']],
             <<<OUTPUT
 Invalid argument vendor/package. Use "composer require vendor/package" instead to add packages to your composer.json.
 OUTPUT
-            ,
-            true
         ];
 
         yield 'it writes an error when no-install flag is passed' => [
             [
-                'repositories' => [
-                    'packages' => [
-                        'type' => 'package',
-                        'package' => [
-                            [
-                                'name' => 'vendor/package',
-                                'description' => 'generic description',
-                                'version' => '1.0.0',
-                                'dist' => [
-                                    'url' =>  'https://example.org',
-                                    'type' => 'zip'
-                                ]
-                            ],
-                        ]
-                    ]
-                ],
-                'require' => [
-                    'vendor/package' => '^1.0'
-                ]
+                'repositories' => [],
             ],
             ['--no-install' => true],
             <<<OUTPUT
 Invalid option "--no-install". Use "composer update --no-install" instead if you are trying to update the composer.lock file.
 OUTPUT
-            ,
-            true
         ];
     }
+
+    public function testInstallFromEmptyVendor(): void
+    {
+        $this->initTempComposer([
+            'require' => [
+                'root/req' => '1.*',
+            ],
+            'require-dev' => [
+                'root/another' => '1.*',
+            ],
+        ]);
+
+        $rootReqPackage = self::getPackage('root/req');
+        $anotherPackage = self::getPackage('root/another');
+        // Set as a metapackage so that we can do the whole post-remove update & install process without Composer trying to download them (DownloadManager::getDownloaderForPackage).
+        $rootReqPackage->setType('metapackage');
+        $anotherPackage->setType('metapackage');
+
+        $this->createComposerLock([$rootReqPackage], [$anotherPackage]);
+
+        $appTester = $this->getApplicationTester();
+        $appTester->run(['command' => 'install', '--no-progress' => true]);
+
+        $this->assertSame('Installing dependencies from lock file (including require-dev)
+Verifying lock file contents can be installed on current platform.
+Package operations: 2 installs, 0 updates, 0 removals
+  - Installing root/another (1.0.0)
+  - Installing root/req (1.0.0)
+Generating autoload files', trim($appTester->getDisplay(true)));
+    }
+
+    public function testInstallFromEmptyVendorNoDev(): void
+    {
+        $this->initTempComposer([
+            'require' => [
+                'root/req' => '1.*',
+            ],
+            'require-dev' => [
+                'root/another' => '1.*',
+            ],
+        ]);
+
+        $rootReqPackage = self::getPackage('root/req');
+        $anotherPackage = self::getPackage('root/another');
+        // Set as a metapackage so that we can do the whole post-remove update & install process without Composer trying to download them (DownloadManager::getDownloaderForPackage).
+        $rootReqPackage->setType('metapackage');
+        $anotherPackage->setType('metapackage');
+
+        $this->createComposerLock([$rootReqPackage], [$anotherPackage]);
+
+        $appTester = $this->getApplicationTester();
+        $appTester->run(['command' => 'install', '--no-progress' => true, '--no-dev' => true]);
+
+        $this->assertSame('Installing dependencies from lock file
+Verifying lock file contents can be installed on current platform.
+Package operations: 1 install, 0 updates, 0 removals
+  - Installing root/req (1.0.0)
+Generating autoload files', trim($appTester->getDisplay(true)));
+    }
+
+    public function testInstallNewPackagesWithExistingPartialVendor(): void
+    {
+        $this->initTempComposer([
+            'require' => [
+                'root/req' => '1.*',
+                'root/another' => '1.*',
+            ],
+        ]);
+        $rootReqPackage = self::getPackage('root/req');
+        $anotherPackage = self::getPackage('root/another');
+        // Set as a metapackage so that we can do the whole post-remove update & install process without Composer trying to download them (DownloadManager::getDownloaderForPackage).
+        $rootReqPackage->setType('metapackage');
+        $anotherPackage->setType('metapackage');
+
+        $this->createComposerLock([$rootReqPackage, $anotherPackage], []);
+        $this->createInstalledJson([$rootReqPackage], []);
+
+        $appTester = $this->getApplicationTester();
+        $appTester->run(['command' => 'install', '--no-progress' => true]);
+
+        $this->assertSame('Installing dependencies from lock file (including require-dev)
+Verifying lock file contents can be installed on current platform.
+Package operations: 1 install, 0 updates, 0 removals
+  - Installing root/another (1.0.0)
+Generating autoload files', trim($appTester->getDisplay(true)));
+    }
 }