diff --git a/dnscrypt-proxy/sources_test.go b/dnscrypt-proxy/sources_test.go
index 845829da..58c58f02 100644
--- a/dnscrypt-proxy/sources_test.go
+++ b/dnscrypt-proxy/sources_test.go
@@ -378,14 +378,16 @@ func TestNewSource(t *testing.T) {
 	}
 	d.n++
 	for _, tt := range []struct {
-		v, key string
-		e      *SourceTestExpect
+		v, key       string
+		refreshDelay time.Duration
+		e            *SourceTestExpect
 	}{
-		{"v1", d.keyStr, &SourceTestExpect{err: "Unsupported source format", Source: &Source{name: "old format", urls: []*url.URL{}, cacheTTL: DefaultPrefetchDelay * 2, prefetchDelay: DefaultPrefetchDelay}}},
-		{"v2", "", &SourceTestExpect{err: "Invalid encoded public key", Source: &Source{name: "invalid public key", urls: []*url.URL{}, cacheTTL: DefaultPrefetchDelay * 3, prefetchDelay: DefaultPrefetchDelay}}},
+		{"", "", 0, &SourceTestExpect{err: " ", Source: &Source{name: "short refresh delay", urls: []*url.URL{}, cacheTTL: DefaultPrefetchDelay, prefetchDelay: DefaultPrefetchDelay}}},
+		{"v1", d.keyStr, DefaultPrefetchDelay * 2, &SourceTestExpect{err: "Unsupported source format", Source: &Source{name: "old format", urls: []*url.URL{}, cacheTTL: DefaultPrefetchDelay * 2, prefetchDelay: DefaultPrefetchDelay}}},
+		{"v2", "", DefaultPrefetchDelay * 3, &SourceTestExpect{err: "Invalid encoded public key", Source: &Source{name: "invalid public key", urls: []*url.URL{}, cacheTTL: DefaultPrefetchDelay * 3, prefetchDelay: DefaultPrefetchDelay}}},
 	} {
 		t.Run(tt.e.Source.name, func(t *testing.T) {
-			got, err := NewSource(tt.e.Source.name, d.xTransport, tt.e.urls, tt.key, tt.e.cachePath, tt.v, tt.e.Source.cacheTTL)
+			got, err := NewSource(tt.e.Source.name, d.xTransport, tt.e.urls, tt.key, tt.e.cachePath, tt.v, tt.refreshDelay)
 			checkResult(t, tt.e, got, err)
 		})
 	}