### Question:
Bill implements Serializable { public void setCurrency(String currency) { this.currency = currency; }  Version getVersion(); void setVersion(Version version); BigDecimal getAmount(); Double getAmountAsDouble(); void setAmount(BigDecimal amount); void setAmountFromDouble(Double amount); String getCurrency(); void setCurrency(String currency); String getAccount(); void setAccount(String account); Address getCreditor(); void setCreditor(Address creditor); String getReferenceType(); void setReferenceType(String referenceType); void updateReferenceType(); String getReference(); void setReference(String reference); void createAndSetCreditorReference(String rawReference); void createAndSetQRReference(String rawReference); Address getDebtor(); void setDebtor(Address debtor); String getUnstructuredMessage(); void setUnstructuredMessage(String unstructuredMessage); String getBillInformation(); void setBillInformation(String billInformation); AlternativeScheme[] getAlternativeSchemes(); void setAlternativeSchemes(AlternativeScheme[] alternativeSchemes); BillFormat getFormat(); void setFormat(BillFormat format); @Override boolean equals(Object o); @Override int hashCode(); @Override String toString(); static final String REFERENCE_TYPE_NO_REF; static final String REFERENCE_TYPE_QR_REF; static final String REFERENCE_TYPE_CRED_REF; }### Answer:
@Test void setCurrency() { Bill bill = new Bill(); bill.setCurrency("EUR"); assertEquals("EUR", bill.getCurrency()); }