+ Fixes PSR4 auto-loading issue in the test case fpr dump graphql schema command

+ Fixes code styling in the same test class
+ Replaces the deprecated assertion with the recommended one
+ Installs phpunit library
+ Fixes schema location path in phpunit xml
+ Adds a composer.lock file
+ Removes composer.lock file from .gitignore file

Author: junaid farooq

.gitignore

@@ -1,5 +1,4 @@
 /vendor/
-/composer.lock
 /build
 /var
 /cache

Tests/TheCodingMachine/Graphqlite/Bundle/Tests/Command/DumpSchemaCommandTest.php renamed to Tests/Command/DumpSchemaCommandTest.php

@@ -1,17 +1,18 @@
 <?php
 
-
 namespace TheCodingMachine\Graphqlite\Bundle\Tests\Command;
 
-
 use PHPUnit\Framework\TestCase;
+use Symfony\Bundle\FrameworkBundle\Console\Application;
 use Symfony\Component\Console\Tester\CommandTester;
 use TheCodingMachine\Graphqlite\Bundle\Tests\GraphqliteTestingKernel;
-use Symfony\Bundle\FrameworkBundle\Console\Application;
 
 class DumpSchemaCommandTest extends TestCase
 {
-    public function testExecute()
+    /**
+     * @test
+     */
+    public function it_executes_successfully(): void
     {
         $kernel = new GraphqliteTestingKernel();
         $application = new Application($kernel);
@@ -20,7 +21,7 @@ public function testExecute()
         $commandTester = new CommandTester($command);
         $commandTester->execute([]);
 
-        $this->assertRegExp(
+        self::assertMatchesRegularExpression(
             '/type Product {[\s"]*seller: Contact\s*name: String!\s*price: Float!\s*}/',
             $commandTester->getDisplay()
         );

composer.json

@@ -41,7 +41,8 @@
     "symfony/phpunit-bridge": "^5.3",
     "thecodingmachine/phpstan-strict-rules": "^v0.12.1",
     "composer/package-versions-deprecated": "^1.8",
-    "phpstan/phpstan-webmozart-assert": "^0.12.12"
+    "phpstan/phpstan-webmozart-assert": "^0.12.12",
+    "phpunit/phpunit": "^9.5"
   },
   "conflict": {
     "mouf/classname-mapper": "<1.0.2",