Add stub validation test

Author: mglaman

tests/src/StubTest.php

@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+namespace mglaman\PHPStanDrupal\Tests;
+
+use PHPStan\Analyser\Error;
+use PHPStan\PhpDoc\StubFilesProvider;
+use PHPStan\PhpDoc\StubValidator;
+use PHPStan\Testing\PHPStanTestCase;
+
+final class StubTest extends PHPStanTestCase
+{
+    use AdditionalConfigFilesTrait;
+
+    public function testValid(): void {
+        $projectStubFiles = self::getContainer()
+            ->getByType(StubFilesProvider::class)
+            ->getProjectStubFiles();
+        $stubErrors = self::getContainer()
+            ->getByType(StubValidator::class)
+            ->validate($projectStubFiles, true);
+        $errorsAsArrays = array_map(
+            static fn (Error $error) => $error->jsonSerialize(),
+            $stubErrors
+        );
+        self::assertEquals(
+            [],
+            $errorsAsArrays,
+            var_export($errorsAsArrays, true)
+        );
+    }
+
+}