diff --git a/dnsfilter/dnsfilter_test.go b/dnsfilter/dnsfilter_test.go
index 00324471..27d203bb 100644
--- a/dnsfilter/dnsfilter_test.go
+++ b/dnsfilter/dnsfilter_test.go
@@ -10,6 +10,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/bluele/gcache"
 	"github.com/miekg/dns"
 )
 
@@ -572,3 +573,17 @@ func BenchmarkSafeSearchParallel(b *testing.B) {
 		}
 	})
 }
+
+func TestDnsfilterDialCache(t *testing.T) {
+	d := Dnsfilter{}
+	dialCache = gcache.New(1).LRU().Expiration(30 * time.Minute).Build()
+
+	d.shouldBeInDialCache("hostname")
+	if searchInDialCache("hostname") != "" {
+		t.Errorf("searchInDialCache")
+	}
+	addToDialCache("hostname", "1.1.1.1")
+	if searchInDialCache("hostname") != "1.1.1.1" {
+		t.Errorf("searchInDialCache")
+	}
+}