agent: tests for DNS truncate config

command/agent/config_test.go

@@ -346,6 +346,17 @@ func TestDecodeConfig(t *testing.T) {
 		t.Fatalf("bad: %#v", config)
 	}
 
+	// DNS enable truncate
+	input = `{"dns_config": {"enable_truncate": true}}`
+	config, err = DecodeConfig(bytes.NewReader([]byte(input)))
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	if !config.DNSConfig.EnableTruncate {
+		t.Fatalf("bad: %#v", config)
+	}
+
 	// CheckUpdateInterval
 	input = `{"check_update_interval": "10m"}`
 	config, err = DecodeConfig(bytes.NewReader([]byte(input)))
@@ -576,6 +587,7 @@ func TestMergeConfig(t *testing.T) {
 			},
 			AllowStale:     true,
 			MaxStale:       30 * time.Second,
+			EnableTruncate: true,
 		},
 		Domain:        "other",
 		LogLevel:      "info",