### Question:
Sgn extends TransferFunction implements Serializable { public Properties getProperties() { Properties properties = new java.util.Properties(); properties.setProperty("transferFunction", TransferFunctionType.SGN.toString()); return properties; }  double getOutput(double net); Properties getProperties();  }### Answer:
@Test public void testGetProperties() { Properties expResult = new Properties(); expResult.setProperty("transferFunction", TransferFunctionType.SGN.toString()); Properties result = instance.getProperties(); assertEquals(expResult, result); }