Merge branch 'PortChange' into 'main'

Portchange

Closes #64

See merge request cse1105/2025-2026/teams/csep-team-76!62

server/src/test/java/server/PortCheckerTest.java

@@ -0,0 +1,61 @@
+package server;
+
+import org.junit.jupiter.api.Test;
+import java.io.IOException;
+import java.net.ServerSocket;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class PortCheckerTest {
+    @Test
+    void portAvailable() {
+        PortChecker checker = new PortChecker();
+
+        int port = 0; //will find a random available port
+        boolean available = checker.isPortAvailable(port);
+
+        assertTrue(available);
+    }
+    @Test
+    void portNotAvailable(){
+        try  {
+            ServerSocket socket = new ServerSocket(0);
+            int usedPort = socket.getLocalPort();
+
+            PortChecker checker = new PortChecker();
+            boolean notFree = checker.isPortAvailable(usedPort);
+            assertFalse(notFree);
+        }
+        catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+    @Test
+    void invalidPort(){
+        PortChecker checker = new PortChecker();
+
+        assertThrows(IllegalArgumentException.class, ()-> {
+            checker.isPortAvailable(-1);
+                }
+        );
+        assertThrows(IllegalArgumentException.class, ()-> {
+            checker.isPortAvailable(65536);
+                }
+        );
+    }
+    @Test
+    void findFreePort() throws IOException {
+        PortChecker checker = new PortChecker();
+
+        int port = checker.findFreePort();
+        int defaultPort = 8080;
+        int lastPort = 8090;
+
+        boolean greaterOrEqual = port >= defaultPort;
+        boolean lessOrEqual = port <= lastPort;
+        boolean inRange = greaterOrEqual && lessOrEqual;
+        boolean isItFree = checker.isPortAvailable(port);
+
+        assertTrue(inRange);
+    }
+}