### Question:
MetricKey implements IHasShortcut { public String toString() { return String.format("MetricKey=[metric=%s, name=%s, tags=%s, id=%s]", metric, name, tags, id); }  @JsonProperty("id") String getId(); @JsonProperty("metric") String getMetric(); @JsonProperty("tags") Tags getTags(); @JsonProperty("name") String getName(); @Override boolean equals(Object o); @Override int hashCode(); static MetricKey fromValue(MetricSpecification spec); static MetricKey fromValue(String name, String metric, String tags); String toString(); @Override String getShortcut();  }### Answer:
@Test public void testToString() throws Exception { }