diff --git a/pkg/config/slog_config_test.go b/pkg/config/slog_config_test.go
index d6b3ef7..157a284 100644
--- a/pkg/config/slog_config_test.go
+++ b/pkg/config/slog_config_test.go
@@ -3,62 +3,144 @@ package config
 import (
 	"errors"
 	"testing"
+
+	"log/slog"
 )
 
 func TestGetSlogLogger(t *testing.T) {
-	t.Run("Wrong type of log level", func(t *testing.T) {
-		const LogLevel = "infox"
-		const LogFormat = defaultLogFormat
-		logger, err := getSlogLogger(LogLevel, LogFormat)
+	t.Run("wrong type of log level", func(t *testing.T) {
+		const logLevel = "infox"
+		const logFormat = defaultLogFormat
+		logger, err := getSlogLogger(logLevel, logFormat)
 		if logger != nil {
-			t.Errorf("expected logger to be nil, got %s\"", logger)
+			t.Errorf("expected logger to be nil, got %v", logger)
 		}
-		if err.Error() != "slog: level string \"infox\": unknown name" {
-			t.Errorf("expected error to be '%s', got %s\"", "slog: level string \"infox\": unknown name", err)
+		if err == nil || err.Error() != "slog: level string \"infox\": unknown name" {
+			t.Errorf("expected error to be '%s', got %v", "slog: level string \"infox\": unknown name", err)
 		}
 	})
-	t.Run("Wrong type of log level", func(t *testing.T) {
-		const LogLevel = "warn"
-		const LogFormat = defaultLogFormat
-		logger, err := getSlogLogger(LogLevel, LogFormat)
+
+	t.Run("correct log level with default format", func(t *testing.T) {
+		const logLevel = "warn"
+		const logFormat = defaultLogFormat
+		logger, err := getSlogLogger(logLevel, logFormat)
 		if err != nil {
-			t.Errorf("expected error to be nil, got %s\"", err)
+			t.Errorf("expected error to be nil, got %v", err)
 		}
 		if logger == nil {
-			t.Errorf("expected logger to be not nil, got %s\"", logger)
+			t.Errorf("expected logger to be not nil, got %v", logger)
 		}
+
+		verifyLoggerHandler(t, logger, logFormat)
 	})
-	t.Run("Wrong type of log format", func(t *testing.T) {
-		const LogLevel = defaultLogLevel
-		const LogFormat = "test"
-		logger, err := getSlogLogger(LogLevel, LogFormat)
+
+	t.Run("wrong type of log format", func(t *testing.T) {
+		const logLevel = defaultLogLevel
+		const logFormat = "test"
+		logger, err := getSlogLogger(logLevel, logFormat)
 		if logger != nil {
-			t.Errorf("expected logger to be nil, got %s\"", logger)
+			t.Errorf("expected logger to be nil, got %v", logger)
 		}
 		if !errors.Is(err, ErrUnknownLogFormat) {
-			t.Errorf("expected error to be '%s', got %s\"", ErrUnknownLogFormat, err)
+			t.Errorf("expected error to be '%v', got %v", ErrUnknownLogFormat, err)
 		}
 	})
-	t.Run("Correct type of log format", func(t *testing.T) {
-		const LogLevel = defaultLogLevel
-		const LogFormat = defaultLogFormat
-		logger, err := getSlogLogger(LogLevel, LogFormat)
+
+	t.Run("correct log level and format", func(t *testing.T) {
+		const logLevel = defaultLogLevel
+		const logFormat = defaultLogFormat
+		logger, err := getSlogLogger(logLevel, logFormat)
 		if err != nil {
-			t.Errorf("expected error to be nil, got %s\"", err)
+			t.Errorf("expected error to be nil, got %v", err)
 		}
 		if logger == nil {
-			t.Errorf("expected logger to be not nil, got %s\"", logger)
+			t.Errorf("expected logger to be not nil, got %v", logger)
 		}
+
+		verifyLoggerHandler(t, logger, logFormat)
 	})
-	t.Run("Json type of log format", func(t *testing.T) {
-		const LogLevel = defaultLogLevel
-		const LogFormat = "json"
-		logger, err := getSlogLogger(LogLevel, LogFormat)
+
+	t.Run("json log format", func(t *testing.T) {
+		const logLevel = defaultLogLevel
+		const logFormat = "json"
+		logger, err := getSlogLogger(logLevel, logFormat)
 		if err != nil {
-			t.Errorf("expected error to be nil, got %s\"", err)
+			t.Errorf("expected error to be nil, got %v", err)
 		}
 		if logger == nil {
-			t.Errorf("expected logger to be not nil, got %s\"", logger)
+			t.Errorf("expected logger to be not nil, got %v", logger)
+		}
+
+		verifyLoggerHandler(t, logger, logFormat)
+	})
+}
+
+func verifyLoggerHandler(t *testing.T, logger *slog.Logger, expectedFormat string) {
+	handler := logger.Handler()
+	if handler == nil {
+		t.Errorf("expected handler to be not nil, got nil")
+	}
+
+	switch h := handler.(type) {
+	case *slog.TextHandler:
+		if expectedFormat != LogFormatText {
+			t.Errorf("expected TextHandler for format %s, got %T", expectedFormat, h)
+		}
+	case *slog.JSONHandler:
+		if expectedFormat != LogFormatJSON {
+			t.Errorf("expected JSONHandler for format %s, got %T", expectedFormat, h)
+		}
+	default:
+		t.Errorf("unexpected handler type: %T", h)
+	}
+}
+
+func TestSetupSlog(t *testing.T) {
+	t.Run("valid config", func(t *testing.T) {
+		cfg := &Config{
+			Logging: LoggingConfig{
+				Level:  "info",
+				Format: "text",
+			},
+		}
+
+		err := SetupSlog(cfg)
+		if err != nil {
+			t.Errorf("expected error to be nil, got %v", err)
+		}
+
+		// Verify that the default logger is set
+		defaultLogger := slog.Default()
+		if defaultLogger == nil {
+			t.Errorf("expected default logger to be not nil, got nil")
+		}
+	})
+
+	t.Run("invalid log level", func(t *testing.T) {
+		cfg := &Config{
+			Logging: LoggingConfig{
+				Level:  "invalid-level",
+				Format: "text",
+			},
+		}
+
+		err := SetupSlog(cfg)
+		if err == nil {
+			t.Errorf("expected error, got nil")
+		}
+	})
+
+	t.Run("invalid log format", func(t *testing.T) {
+		cfg := &Config{
+			Logging: LoggingConfig{
+				Level:  "info",
+				Format: "invalid-format",
+			},
+		}
+
+		err := SetupSlog(cfg)
+		if err == nil || !errors.Is(err, ErrUnknownLogFormat) {
+			t.Errorf("expected error '%v', got %v", ErrUnknownLogFormat, err)
 		}
 	})
 }