diff --git a/cache.go b/cache.go
index 522b1d1..9ff2fb8 100644
--- a/cache.go
+++ b/cache.go
@@ -27,7 +27,7 @@ func NewQueryCache(max int) *QueryCache {
 // NewQuery looks for the given query in the cache and returns it.
 // If the query is not found it will be generated and inserted in the cache..
 func (qc *QueryCache) NewQuery(s string) (q *Query, err error) {
-	q = qc.lookup(s)
+	q = qc.Lookup(s)
 	if q != nil {
 		return
 	}
@@ -44,7 +44,8 @@ func (qc *QueryCache) NewQuery(s string) (q *Query, err error) {
 	return
 }
 
-func (qc *QueryCache) lookup(s string) *Query {
+// Lookup looks for a given query string and returns the query object or nil.
+func (qc *QueryCache) Lookup(s string) *Query {
 	qc.RLock()
 	defer qc.RUnlock()
 	if q, ok := qc.m[s]; ok {
diff --git a/cache_test.go b/cache_test.go
new file mode 100644
index 0000000..63a6fc5
--- /dev/null
+++ b/cache_test.go
@@ -0,0 +1,19 @@
+package filter
+
+import "testing"
+
+func TestNewQueryCache(t *testing.T) {
+	c := NewQueryCache(1)
+	_, err := c.NewQuery("Int:1")
+	if err != nil {
+		t.Error(err)
+	}
+	q2, err := c.NewQuery("Int:2")
+	if err != nil {
+		t.Error(err)
+	}
+	q3 := c.Lookup("Int:2")
+	if q2.String() != q3.String() {
+		t.Error("q2 != q3")
+	}
+}