@@ -0,0 +1,700 @@
+package com.netflix.spectator.spark;%0A%0Aimport com.typesafe.config.Config;%0Aimport com.typesafe.config.ConfigFactory;%0Aimport org.junit.jupiter.api.Assertions;%0Aimport org.junit.jupiter.api.Test;%0A%0Aimport java.time.Duration;%0A%0Apublic class SpectatorConfigTest %7B%0A%0A  private final SpectatorConfig config = new SpectatorConfig(%0A      ConfigFactory.load().getConfig(%22spectator.spark.stateless%22)%0A  );%0A%0A  @Test%0A  public void enabled() %7B%0A    Assertions.assertTrue(config.enabled());%0A  %7D%0A%0A  @Test%0A  public void frequency() %7B%0A    Assertions.assertEquals(Duration.ofSeconds(5), config.frequency());%0A  %7D%0A%0A  @Test%0A  public void meterTTL() %7B%0A    Assertions.assertEquals(Duration.ofMinutes(15), config.meterTTL());%0A  %7D%0A%7D%0A

add test case for registry config (#818)