Method TestMinResolutionInterval

internal/resolver/dns/dns_resolver_test.go:1411–1445

Test verifies that changing [MinResolutionInterval] variable correctly effects the resolution behaviour

(t *testing.T)

// Test verifies that changing [MinResolutionInterval] variable correctly effects
// the resolution behaviour
func (s) TestMinResolutionInterval(t *testing.T) {
	const target = "foo.bar.com"

	overrideResolutionInterval(t, 1*time.Millisecond)
	tr := &testNetResolver{
		hostLookupTable: map[string][]string{
			"foo.bar.com": {"1.2.3.4", "5.6.7.8"},
		},
		txtLookupTable: map[string][]string{
			"_grpc_config.foo.bar.com": txtRecordServiceConfig(txtRecordGood),
		},
	}
	overrideNetResolver(t, tr)

	r, stateCh, _ := buildResolverWithTestClientConn(t, target)

	wantAddrs := []resolver.Address{{Addr: "1.2.3.4" + colonDefaultPort}, {Addr: "5.6.7.8" + colonDefaultPort}}
	wantSC := mustParseServiceConfig(t, scJSON)

	for i := 0; i < 5; i++ {
		// set context timeout slightly higher than the min resolution interval to make sure resolutions
		// happen successfully
		ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
		defer cancel()

		verifyUpdateFromResolver(ctx, t, stateCh, resolverUpdate{
			addrs: wantAddrs,
			endpoints: []resolver.Endpoint{
				{Addresses: []resolver.Address{{Addr: "1.2.3.4" + colonDefaultPort}}},
				{Addresses: []resolver.Address{{Addr: "5.6.7.8" + colonDefaultPort}}},
			},
			serviceConfig: wantSC})
		r.ResolveNow(resolver.ResolveNowOptions{})
	}
}

// TestMinResolutionInterval_NoExtraDelay verifies that there is no extra delay
// between two resolution requests apart from [MinResolutionInterval].