### Question:
Sum extends InputFunction implements Serializable { @Override public double getOutput(List<Connection> inputConnections) { double output = 0d; for (Connection connection : inputConnections) { output += connection.getInput(); } return output; }  @Override double getOutput(List<Connection> inputConnections);  }### Answer:
@Test public void testGetOutput() { for (int i = 0; i < inputNeurons.size(); i++) { inputNeurons.get(i).setInput(inputs[i]); inputNeurons.get(i).calculate(); } double result = instance.getOutput(inputConnections); assertEquals(expected, result, .000001); }