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package jcgp.tests;
import static org.junit.Assert.assertTrue;
import java.util.Random;
import jcgp.Utilities;
import jcgp.modules.function.Arithmetic;
import jcgp.modules.function.Function;
import jcgp.parameters.Parameters;
import jcgp.population.Chromosome;
import jcgp.population.Connection;
import jcgp.population.Node;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
/**
*
* Tests which cover the behaviour specified for a node.
*
* - A node should contain read-only row and column values which are set upon construction.
* - It should contain a fully accessible Function object.
* - It should contain a set of connections which can be initialised and randomly
* modified. It should be able to return an addressed connection.
* - It should be able to compute a value using its function with its connections as arguments.
*
* WARNING: changing parameters may cause the tests to incorrectly fail!
*
* @author Eduardo Pedroni
*
*/
public class NodeTests {
private Node node;
private static Chromosome chromosome;
// these numbers will be used by the node under test
private final int arg1 = 2;
private final int arg2 = 5;
@BeforeClass
public static void setUpBeforeClass() {
// initialise utilities
Utilities.setResources(new Random(1234), null);
// initialise parameters
Parameters.setColumns(0);
Parameters.setRows(0);
Parameters.setInputs(0);
Parameters.setOutputs(0);
Parameters.setLevelsBack(0);
Parameters.setMutationRate(10);
Parameters.setTotalGenerations(100);
Parameters.setTotalRuns(5);
Parameters.setMaxArity(2);
chromosome = new Chromosome();
}
@Before
public void setUp() throws Exception {
node = new Node(chromosome, 0, 0);
// make node with anonymous addition function and hard-coded value connections
node.initialise(new Arithmetic.Addition(),
new Connection[]{new Connection() {
@Override
public Object getValue() {
// hardcode a value
return arg1;
}
@Override
public String getDescription() {
// blank
return null;
}
},
new Connection() {
@Override
public Object getValue() {
// hardcode a value
return arg2;
}
@Override
public String getDescription() {
// blank
return null;
}
}});
}
@Test
public void rowAndColumnTest() {
assertTrue("Incorrect row.", node.getRow() == 0);
assertTrue("Incorrect column.", node.getColumn() == 0);
}
@Test
public void functionTest() {
// make a new function and assign to node
Function f = new Function() {
@Override
public Object run(Connection... connections) {
// blank
return 0;
}
@Override
public int getArity() {
// blank
return 0;
}
};
node.setFunction(f);
// check that the function returned by the node is f
assertTrue("Incorrect function returned.", node.getFunction() == f);
// check that it outputs 0 as it should
assertTrue("Incorrect function output.", ((Integer) node.getValue()) == 0);
}
@Test
public void evaluationTest() {
// check that addition is working
assertTrue("Node did not return expected value (sum of arguments). Output was: " + ((int) node.getValue()),
((int) node.getValue()) == arg1 + arg2);
// put in a different function, check the output has changed appropriately
node.setFunction(new Arithmetic.Subtraction());
assertTrue("Node did not return expected value (difference of arguments).", ((Integer) node.getValue()) == arg1 - arg2);
}
@Test
public void connectionsTest() {
// make new blank connections, check that they are returned correctly when addressed
Connection conn0, conn1, conn2;
conn0 = new Connection() {
@Override
public Object getValue() {
// blank
return 0;
}
@Override
public String getDescription() {
// blank
return null;
}
};
conn1 = new Connection() {
@Override
public Object getValue() {
// blank
return 0;
}
@Override
public String getDescription() {
// blank
return null;
}
};
node.initialise(null, conn0, conn1);
assertTrue("Connection 0 is incorrect.", node.getConnection(0) == conn0);
assertTrue("Connection 1 is incorrect.", node.getConnection(1) == conn1);
// make yet another connection, set it randomly, check that it is one of the node's connections
conn2 = new Connection() {
@Override
public Object getValue() {
// blank
return 0;
}
@Override
public String getDescription() {
// blank
return null;
}
};
node.setConnection(conn2);
assertTrue("Connection was not found in node.", node.getConnection(0) == conn2 || node.getConnection(1) == conn2);
}
}
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