Switch from ArrayList to List in Graph.

src/main/org/insa/graph/Graph.java

@@ -1,6 +1,5 @@
 package org.insa.graph;
 
-import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
@@ -10,15 +9,15 @@ public class Graph {
     private final int mapId;
 
     // Nodes of the graph.
-    private final ArrayList<Node> nodes;
+    private final List<Node> nodes;
 
     /**
      * @param mapId ID of this graph.
-     * @param nodes List of nodes for this graph.
+     * @param list List of nodes for this graph.
      */
-    public Graph(int mapId, ArrayList<Node> nodes) {
+    public Graph(int mapId, List<Node> list) {
         this.mapId = mapId;
-        this.nodes = nodes;
+        this.nodes = list;
     }
 
     /**

src/test/org/insa/graph/PathTest.java

@@ -0,0 +1,20 @@
+package org.insa.graph;
+
+import java.io.IOException;
+import java.util.Arrays;
+
+import org.junit.jupiter.api.BeforeAll;
+
+public class PathTest {
+
+    // Small graph use for tests
+    private Graph graph;
+
+    @BeforeAll
+    static void initAll() throws IOException {
+        Node[] nodes = new Node[] {};
+
+        graph = new Graph(0, Arrays.asList(nodes));
+    }
+
+}