Add missing error check (#123)

store_test.go

@@ -59,6 +59,10 @@ func TestGH2MaxLength(t *testing.T) {
 	w := httptest.NewRecorder()
 
 	session, err := store.New(req, "my session")
+	if err != nil {
+		t.Fatal("failed to create session", err)
+	}
+
 	session.Values["big"] = make([]byte, base64.StdEncoding.DecodedLen(4096*2))
 	err = session.Save(req, w)
 	if err == nil {