### Question:
Backoff { public Backoff duration(String duration) { this.duration = duration; return this; }  Backoff duration(String duration); @javax.annotation.Nullable @ApiModelProperty(value = "") String getDuration(); void setDuration(String duration); Backoff factor(Integer factor); @javax.annotation.Nullable @ApiModelProperty(value = "") Integer getFactor(); void setFactor(Integer factor); Backoff maxDuration(String maxDuration); @javax.annotation.Nullable @ApiModelProperty(value = "") String getMaxDuration(); void setMaxDuration(String maxDuration); @Override boolean equals(java.lang.Object o); @Override int hashCode(); @Override String toString(); static final String SERIALIZED_NAME_DURATION; static final String SERIALIZED_NAME_FACTOR; static final String SERIALIZED_NAME_MAX_DURATION; }### Answer:
@Test public void durationTest() { }