fix: no initial cache refresh with "fast" start strategy (#804)

lists/list_cache.go

@@ -114,6 +114,9 @@ func NewListCache(t ListCacheType, groupToLinks map[string][]string, refreshPeri
 	var initError error
 	if async {
 		initError = nil
+
+		// start list refresh in the background
+		go b.Refresh()
 	} else {
 		initError = b.refresh(true)
 	}

resolver/blocking_resolver_test.go

@@ -74,7 +74,6 @@ var _ = Describe("BlockingResolver", Label("blockingResolver"), func() {
 		Expect(err).Should(Succeed())
 		sut = tmp.(*BlockingResolver)
 		sut.Next(m)
-		sut.RefreshLists()
 	})
 
 	AfterEach(func() {
@@ -152,6 +151,33 @@ var _ = Describe("BlockingResolver", Label("blockingResolver"), func() {
 		})
 	})
 
+	Describe("Blocking with fast start strategy", func() {
+		BeforeEach(func() {
+			sutConfig = config.BlockingConfig{
+				BlockType: "ZEROIP",
+				BlockTTL:  config.Duration(time.Minute),
+				BlackLists: map[string][]string{
+					"gr1": {"\n/regex/"},
+				},
+				ClientGroupsBlock: map[string][]string{
+					"default": {"gr1"},
+				},
+				StartStrategy: config.StartStrategyTypeFast,
+			}
+
+		})
+
+		When("Domain is on the black list", func() {
+			It("should block request", func() {
+				Eventually(func(g Gomega) {
+					resp, err = sut.Resolve(newRequestWithClient("regex.com.", dns.Type(dns.TypeA), "1.2.1.2", "client1"))
+					g.Expect(err).Should(Succeed())
+					g.Expect(resp.Res.Answer).Should(BeDNSRecord("regex.com.", dns.TypeA, 60, "0.0.0.0"))
+				}).Should(Succeed())
+			})
+		})
+	})
+
 	Describe("Blocking requests", func() {
 		var rType ResponseType
 		BeforeEach(func() {