### Question:
ISOField extends ISOComponent implements Cloneable, Externalizable { @Override public Object getKey() { return fieldNumber; } ISOField();  ISOField(int n);  ISOField(int n, String v); @Override byte[] pack(); @Override int unpack(byte[] b); @Override void unpack(InputStream in); @Override Object getKey(); @Override Object getValue(); @Override void setValue(Object obj); @Override byte[] getBytes(); @Override void dump(PrintStream p, String indent); @Override void setFieldNumber(int fieldNumber); @Override int getFieldNumber(); @Override void writeExternal(ObjectOutput out); @Override void readExternal(ObjectInput in);  }### Answer:
@Test public void testGetKey() throws Throwable { Integer result = (Integer) new ISOField(100).getKey(); assertEquals(100, result.intValue(), "result"); }
@Test public void testGetKey1() throws Throwable { Integer result = (Integer) new ISOField(0).getKey(); assertEquals(0, result.intValue(), "result"); }