UHF-10751: Add tests for monolog configuration

tests/src/Kernel/MonologTest.php

@@ -0,0 +1,98 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\helfi_api_base\Kernel;
+
+use Drupal\KernelTests\KernelTestBase;
+use Drupal\monolog\Logger\ConditionResolver\ConditionResolverInterface;
+use Prophecy\PhpUnit\ProphecyTrait;
+
+/**
+ * Tests monolog configuration.
+ */
+final class MonologTest extends KernelTestBase {
+
+  use ProphecyTrait;
+
+  /**
+   * Log level that is configured for the duration of this test.
+   */
+  private const TEST_LOG_LEVEL = 'warning';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = [
+    'monolog',
+    'helfi_api_base',
+  ];
+
+  /**
+   * Temporary file where logs are stored.
+   *
+   * @var string
+   */
+  private string $logFile;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function bootKernel() : void {
+    // Set test log level before kernel is booted.
+    $this->setSetting('helfi_api_base.log_level', self::TEST_LOG_LEVEL);
+
+    parent::bootKernel();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() : void {
+    parent::setUp();
+
+    $this->logFile = 'temporary://' . $this->randomMachineName();
+
+    $this->container
+      ->getDefinition('monolog.handler.website')
+      ->replaceArgument(0, $this->logFile);
+
+    // Pretend that we are running in web process so Drush log is not used.
+    $this->container->set('monolog.condition_resolver.cli', new class implements ConditionResolverInterface {
+
+      /**
+       * {@inheritdoc}
+       */
+      public function resolve(): bool {
+        return FALSE;
+      }
+
+    });
+  }
+
+  /**
+   * Tests logger message.
+   */
+  public function testLogging() : void {
+    /** @var \Psr\Log\LoggerInterface $logger */
+    $logger = $this->container->get('logger.channel.default');
+    $logger->warning('Test warning message');
+    $logger->debug('Test debug message');
+
+    $log = file_get_contents($this->logFile);
+    $this->assertNotFalse($log);
+
+    // Debug messages were not logged due to the log level.
+    $this->assertStringContainsString('Test warning message', $log);
+    $this->assertStringNotContainsString('Test debug message', $log);
+
+    foreach (explode('\n', $log) as $logLine) {
+      // Message is valid JSON.
+      $message = json_decode($logLine, flags: JSON_THROW_ON_ERROR);
+
+      // Tests \Drupal\helfi_api_base\Logger\CurrentUserProcessor.
+      $this->assertObjectNotHasProperty('user', $message->extra);
+    }
+  }
+
+}