Add installer step removing lockfile

Signed-off-by: Aleksei Khudiakov <aleksey@xerkus.pro>

src/MezzioInstaller/OptionalPackages.php

@@ -211,6 +211,7 @@ public static function install(Event $event): void
         $installer->io->write('<info>Setting up optional packages</info>');
 
         $installer->setupDataAndCacheDir();
+        $installer->removeLockfile();
         $installer->removeDevDependencies();
         $installer->setInstallType($installer->requestInstallType());
         $installer->setupDefaultApp();
@@ -253,6 +254,20 @@ public function setupDataAndCacheDir(): void
         }
     }
 
+    /**
+     * Remove composer lockfile.
+     *
+     * Installer adds and removes dependencies which invalidates lockfile.
+     * Dependencies locked in existing lockfile are dependent on PHP version where it was created.
+     */
+    public function removeLockfile(): void
+    {
+        if (is_file($this->projectRoot . '/composer.lock')) {
+            $this->io->write('<info>Removing composer.lock</info>');
+            unlink($this->projectRoot . '/composer.lock');
+        }
+    }
+
     /**
      * Cleanup development dependencies.
      *

test/MezzioInstallerTest/RemoveLockfileTest.php

@@ -0,0 +1,48 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MezzioInstallerTest;
+
+use MezzioInstaller\OptionalPackages;
+use org\bovigo\vfs\vfsStream;
+use org\bovigo\vfs\vfsStreamDirectory;
+
+class RemoveLockfileTest extends OptionalPackagesTestCase
+{
+    private OptionalPackages $installer;
+
+    private vfsStreamDirectory $project;
+
+    /** @var string URL of project root */
+    private string $projectRoot;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        $this->project     = vfsStream::setup('project-root');
+        $this->projectRoot = vfsStream::url('project-root');
+        $this->installer   = $this->createOptionalPackages($this->projectRoot);
+    }
+
+    public function testRemovesLockfileWhenInvoked(): void
+    {
+        vfsStream::newFile('composer.lock')->at($this->project)->withContent('{}');
+        $this->io
+            ->expects($this->once())
+            ->method('write')
+            ->with($this->stringContains('Removing composer.lock'));
+        $this->installer->removeLockfile();
+
+        self::assertFalse($this->project->hasChild('composer.lock'), 'Lockfile was not deleted');
+    }
+
+    public function testNoopWhenNoLockfileExists(): void
+    {
+        self::assertFalse($this->project->hasChild('composer.lock'));
+        $this->io
+            ->expects($this->never())
+            ->method('write');
+        $this->installer->removeLockfile();
+    }
+}