diff --git a/asynq_test.go b/asynq_test.go
index 3aff019..b68256d 100644
--- a/asynq_test.go
+++ b/asynq_test.go
@@ -5,6 +5,7 @@
 package asynq
 
 import (
+	"flag"
 	"sort"
 	"testing"
 
@@ -14,16 +15,28 @@ import (
 	"github.com/hibiken/asynq/internal/log"
 )
 
-// This file defines test helper functions used by
-// other test files.
+//============================================================================
+// This file defines helper functions and variables used in other test files.
+//============================================================================
 
-// redis used for package testing.
-const (
-	redisAddr = "localhost:6379"
-	redisDB   = 14
+// variables used for package testing.
+var (
+	redisAddr string
+	redisDB   int
+
+	testLogLevel = FatalLevel
 )
 
-var testLogger = log.NewLogger(nil)
+var testLogger *log.Logger
+
+func init() {
+	flag.StringVar(&redisAddr, "redis_addr", "localhost:6379", "redis address to use in testing")
+	flag.IntVar(&redisDB, "redis_db", 14, "redis db number to use in testing")
+	flag.Var(&testLogLevel, "loglevel", "log level to use in testing")
+
+	testLogger = log.NewLogger(nil)
+	testLogger.SetLevel(log.Level(testLogLevel))
+}
 
 func setup(tb testing.TB) *redis.Client {
 	tb.Helper()
diff --git a/server_test.go b/server_test.go
index 6fb7f28..82d1c72 100644
--- a/server_test.go
+++ b/server_test.go
@@ -28,6 +28,7 @@ func TestServer(t *testing.T) {
 	c := NewClient(r)
 	srv := NewServer(r, Config{
 		Concurrency: 10,
+		LogLevel:    testLogLevel,
 	})
 
 	// no-op handler
@@ -58,7 +59,7 @@ func TestServerRun(t *testing.T) {
 	ignoreOpt := goleak.IgnoreTopFunction("github.com/go-redis/redis/v7/internal/pool.(*ConnPool).reaper")
 	defer goleak.VerifyNoLeaks(t, ignoreOpt)
 
-	srv := NewServer(RedisClientOpt{Addr: ":6379"}, Config{})
+	srv := NewServer(RedisClientOpt{Addr: ":6379"}, Config{LogLevel: testLogLevel})
 
 	done := make(chan struct{})
 	// Make sure server exits when receiving TERM signal.
@@ -83,7 +84,7 @@ func TestServerRun(t *testing.T) {
 }
 
 func TestServerErrServerStopped(t *testing.T) {
-	srv := NewServer(RedisClientOpt{Addr: ":6379"}, Config{})
+	srv := NewServer(RedisClientOpt{Addr: ":6379"}, Config{LogLevel: testLogLevel})
 	handler := NewServeMux()
 	if err := srv.Start(handler); err != nil {
 		t.Fatal(err)
@@ -96,7 +97,7 @@ func TestServerErrServerStopped(t *testing.T) {
 }
 
 func TestServerErrNilHandler(t *testing.T) {
-	srv := NewServer(RedisClientOpt{Addr: ":6379"}, Config{})
+	srv := NewServer(RedisClientOpt{Addr: ":6379"}, Config{LogLevel: testLogLevel})
 	err := srv.Start(nil)
 	if err == nil {
 		t.Error("Starting server with nil handler: (*Server).Start(nil) did not return error")
@@ -105,7 +106,7 @@ func TestServerErrNilHandler(t *testing.T) {
 }
 
 func TestServerErrServerRunning(t *testing.T) {
-	srv := NewServer(RedisClientOpt{Addr: ":6379"}, Config{})
+	srv := NewServer(RedisClientOpt{Addr: ":6379"}, Config{LogLevel: testLogLevel})
 	handler := NewServeMux()
 	if err := srv.Start(handler); err != nil {
 		t.Fatal(err)
@@ -126,7 +127,7 @@ func TestServerWithRedisDown(t *testing.T) {
 	}()
 	r := rdb.NewRDB(setup(t))
 	testBroker := testbroker.NewTestBroker(r)
-	srv := NewServer(RedisClientOpt{Addr: ":6379"}, Config{})
+	srv := NewServer(RedisClientOpt{Addr: ":6379"}, Config{LogLevel: testLogLevel})
 	srv.broker = testBroker
 	srv.scheduler.broker = testBroker
 	srv.heartbeater.broker = testBroker
@@ -158,7 +159,7 @@ func TestServerWithFlakyBroker(t *testing.T) {
 	}()
 	r := rdb.NewRDB(setup(t))
 	testBroker := testbroker.NewTestBroker(r)
-	srv := NewServer(RedisClientOpt{Addr: redisAddr, DB: redisDB}, Config{})
+	srv := NewServer(RedisClientOpt{Addr: redisAddr, DB: redisDB}, Config{LogLevel: testLogLevel})
 	srv.broker = testBroker
 	srv.scheduler.broker = testBroker
 	srv.heartbeater.broker = testBroker