add tests

tests/Db/Logger/LoggerTest.php

@@ -0,0 +1,65 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yiisoft\Db\Tests\Db\Logger;
+
+use PHPUnit\Framework\TestCase;
+use Psr\Log\LoggerInterface;
+use Psr\Log\LogLevel;
+use Yiisoft\Db\Logger\Context\QueryContext;
+use Yiisoft\Db\Logger\DbLogger;
+use Yiisoft\Db\Logger\DbLoggerEvent;
+use Yiisoft\Db\Tests\Support\TestTrait;
+
+/**
+ * @group db
+ */
+final class LoggerTest extends TestCase
+{
+    use TestTrait;
+
+    public function testWithDefaultLevel(): void
+    {
+        $queryContext = new QueryContext(__METHOD__, 'SQL', 'category');
+
+        $logger = new DbLogger($this->createPsrLogger(LogLevel::INFO, 'SQL', ['category']));
+
+        $logger->log(DbLoggerEvent::QUERY, $queryContext);
+    }
+
+    public function testWithOverrideLevel(): void
+    {
+        $queryContext = new QueryContext(__METHOD__, 'SQL', 'category');
+
+        $logger = new DbLogger($this->createPsrLogger(LogLevel::WARNING, 'SQL', ['category']));
+        $logger->setLevel(DbLoggerEvent::QUERY, LogLevel::WARNING);
+
+        $logger->log(DbLoggerEvent::QUERY, $queryContext);
+    }
+
+    public function testWithoutLevel(): void
+    {
+        $queryContext = new QueryContext(__METHOD__, 'SQL', 'category');
+
+        $logger = new DbLogger($this->createPsrLogger(LogLevel::DEBUG, 'SQL', ['category']));
+
+        $logger->log('unknown_event', $queryContext);
+    }
+
+    private function createPsrLogger(string $level, string $sql, array $params): LoggerInterface
+    {
+        $logger = $this->createMock(LoggerInterface::class);
+
+        $logger
+            ->expects($this->once())
+            ->method('log')
+            ->with(
+                $level,
+                $sql,
+                $params
+            );
+
+        return $logger;
+    }
+}