### Question:
InvoiceResponse { public InvoiceResponse invoice(Invoice invoice) { this.invoice = invoice; return this; }  InvoiceResponse invoice(Invoice invoice); @ApiModelProperty(required = true, value = "") Invoice getInvoice(); void setInvoice(Invoice invoice); @Override boolean equals(java.lang.Object o); @Override int hashCode(); @Override String toString(); static final String SERIALIZED_NAME_INVOICE; }### Answer:
@Test public void invoiceTest() { }