diff --git a/tests/LoggerTest.php b/tests/LoggerTest.php
index b4eb77c..ddcb544 100644
--- a/tests/LoggerTest.php
+++ b/tests/LoggerTest.php
@@ -2,7 +2,10 @@
 
 namespace yii1tech\psr\log\test;
 
+use CLogger;
+use Psr\Log\LogLevel;
 use yii1tech\psr\log\Logger;
+use yii1tech\psr\log\test\support\ArrayLogger;
 
 class LoggerTest extends TestCase
 {
@@ -16,4 +19,105 @@ public function testSetUpYiiLogEnabled(): void
         $logger->enableYiiLog(true);
         $this->assertTrue($logger->yiiLogEnabled);
     }
+
+    public function testSetupPsrLogger(): void
+    {
+        $logger = new Logger();
+
+        $psrLogger = new ArrayLogger();
+
+        $logger->setPsrLogger($psrLogger);
+
+        $this->assertSame($psrLogger, $logger->getPsrLogger());
+
+        $logger->setPsrLogger([
+            'class' => ArrayLogger::class,
+        ]);
+
+        $this->assertTrue($logger->getPsrLogger() instanceof ArrayLogger);
+    }
+
+    public function testWritePsrLog(): void
+    {
+        $psrLogger = new ArrayLogger();
+
+        $logger = (new Logger())
+            ->setPsrLogger($psrLogger);
+
+        $logger->log('test message', CLogger::LEVEL_INFO, 'test-category');
+
+        $logs = $psrLogger->flush();
+        $this->assertFalse(empty($logs[0]));
+        $this->assertSame(LogLevel::INFO, $logs[0]['level']);
+        $this->assertSame('test message', $logs[0]['message']);
+        $this->assertSame(['category' => 'test-category'], $logs[0]['context']);
+
+        $logger->log('test message', CLogger::LEVEL_INFO, ['category' => 'context-category']);
+
+        $logs = $psrLogger->flush();
+        $this->assertFalse(empty($logs[0]));
+        $this->assertSame(['category' => 'context-category'], $logs[0]['context']);
+
+        $logger->log('test message', CLogger::LEVEL_INFO, ['foo' => 'bar']);
+
+        $logs = $psrLogger->flush();
+        $this->assertFalse(empty($logs[0]));
+        $this->assertSame(
+            [
+                'foo' => 'bar',
+                'category' => 'application',
+            ],
+            $logs[0]['context']
+        );
+    }
+
+    public function testWriteYiiLog(): void
+    {
+        $logger = (new Logger())
+            ->enableYiiLog(true);
+
+        $logger->log('test message', CLogger::LEVEL_INFO, 'test-category');
+
+        $logs = $logger->getLogs();
+        $logger->flush();
+
+        $this->assertFalse(empty($logs[0]));
+        $this->assertSame('test message', $logs[0][0]);
+        $this->assertSame(LogLevel::INFO, $logs[0][1]);
+        $this->assertSame('test-category', $logs[0][2]);
+
+        $logger->log('test message', CLogger::LEVEL_INFO, ['category' => 'context-category']);
+
+        $logs = $logger->getLogs();
+        $logger->flush();
+
+        $this->assertFalse(empty($logs[0]));
+        $this->assertSame('context-category', $logs[0][2]);
+
+        $logger->log('test message', CLogger::LEVEL_INFO, ['foo' => 'bar']);
+
+        $logs = $logger->getLogs();
+        $logger->flush();
+
+        $this->assertFalse(empty($logs[0]));
+        $this->assertSame('application', $logs[0][2]);
+
+        $logger->log('test message', LogLevel::INFO, 'test-category');
+
+        $logs = $logger->getLogs();
+        $logger->flush();
+
+        $this->assertFalse(empty($logs[0]));
+        $this->assertSame(LogLevel::INFO, $logs[0][1]);
+    }
+
+    public function testDisableYiiLog(): void
+    {
+        $logger = (new Logger())
+            ->enableYiiLog(false);
+
+        $logger->log('test message', CLogger::LEVEL_INFO, 'test-category');
+
+        $this->assertEmpty($logger->getLogs());
+    }
 }
\ No newline at end of file
diff --git a/tests/support/AbstractArrayLogger.php b/tests/support/AbstractArrayLogger.php
new file mode 100644
index 0000000..330d322
--- /dev/null
+++ b/tests/support/AbstractArrayLogger.php
@@ -0,0 +1,39 @@
+<?php
+
+namespace yii1tech\psr\log\test\support;
+
+use Psr\Log\LoggerInterface;
+use Psr\Log\LoggerTrait;
+
+/**
+ * AbstractArrayLogger is an intermediate class for {@see ArrayLogger} creation.
+ *
+ * Its existence required since {@see \Psr\Log\LoggerInterface} changes signature over different PHP versions.
+ */
+abstract class AbstractArrayLogger implements LoggerInterface
+{
+    use LoggerTrait;
+
+    /**
+     * @var array[] written log entries.
+     */
+    public $logs = [];
+
+    protected function baseLog($level, $message, array $context = []): void
+    {
+        $this->logs[] = [
+            'level' => $level,
+            'message' => $message,
+            'context' => $context,
+        ];
+    }
+
+    public function flush(): array
+    {
+        $logs = $this->logs;
+
+        $this->logs = [];
+
+        return $logs;
+    }
+}
\ No newline at end of file
diff --git a/tests/support/ArrayLogger.php b/tests/support/ArrayLogger.php
new file mode 100644
index 0000000..6a297f9
--- /dev/null
+++ b/tests/support/ArrayLogger.php
@@ -0,0 +1,21 @@
+<?php
+
+namespace yii1tech\psr\log\test\support;
+
+if (version_compare(phpversion(), '8.0', '>=')) {
+    class ArrayLogger extends AbstractArrayLogger
+    {
+        public function log($level, string|\Stringable $message, array $context = []): void
+        {
+            $this->baseLog($level, $message, $context);
+        }
+    }
+} else {
+    class ArrayLogger extends AbstractArrayLogger
+    {
+        public function log($level, $message, array $context = []): void
+        {
+            $this->baseLog($level, $message, $context);
+        }
+    }
+}
\ No newline at end of file