Refactor Net class by removing unused methods and updating child node retrieval logic in tests

src/main/java/net/berack/upo/valpre/sim/Net.java

@@ -146,20 +146,6 @@ public final class Net implements Iterable<ServerNode> {
         return this.servers.get(index);
     }
 
-    /**
-     * Get one of the child nodes from the parent specified.
-     * If the node has no child then null is returned.
-     * 
-     * @param parent the parent node
-     * @param rng    the random number generator used for getting one of the child
-     * @return the resultig node
-     */
-    public ServerNode getChildOf(ServerNode parent, Rng rng) {
-        var index = this.indices.get(parent);
-        index = this.getChildOf(index, rng);
-        return index < 0 ? null : this.servers.get(index);
-    }
-
     /**
      * Get one of the child nodes from the parent specified. If the index is out of
      * bounds then an exception is thrown. If the node has no child then -1 is
@@ -180,18 +166,6 @@ public final class Net implements Iterable<ServerNode> {
         return -1;
     }
 
-    /**
-     * Get a list of all the children of the parent.
-     * In the list there is the node and the weight associated with.
-     * 
-     * @param parent the parent node
-     * @return the list of children
-     */
-    public List<NetChild> getChildren(ServerNode parent) {
-        var index = this.indices.get(parent);
-        return this.getChildren(index);
-    }
-
     /**
      * Get a list of all the children of the parent.
      * In the list there is the node and the weight associated with.

src/test/java/net/berack/upo/valpre/sim/TestSimulation.java

@@ -2,6 +2,8 @@ package net.berack.upo.valpre.sim;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
 
 import java.util.HashSet;
@@ -152,20 +154,16 @@ public class TestSimulation {
 
         var sample = net.getChildOf(0, rigged);
         assertEquals(1, sample);
-        var sample2 = net.getChildOf(node, rigged);
-        assertEquals(node1, sample2);
+        assertEquals(node1, net.getNode(sample));
     }
 
     @Test
     public void nodeState() {
-        var net = new Net();
-        var node = ServerNode.createQueue("First", 1, const0);
-        net.addNode(node);
-        var state = new ServerNodeState(0, net);
+        var state = new ServerNodeState(1, simpleNet);
 
-        assertEquals(0, state.index);
-        assertEquals(net, state.net);
-        assertEquals(node, state.node);
+        assertEquals(1, state.index);
+        assertEquals(simpleNet, state.net);
+        assertEquals(node1, state.node);
         assertEquals(0, state.numServerBusy);
         assertEquals(0, state.numServerUnavailable);
         assertEquals(0, state.queue.size());