test: add a TCPDownloadFile test that downloads index.html from bbc.co.uk

uses Java nio.* for downloading a file, writing it to /tmp

java/cli/com/cloudius/cli/tests/TCPDownloadFile.java

+package com.cloudius.cli.tests;
+
+import java.io.FileOutputStream;
+import java.net.URL;
+import java.nio.channels.Channels;
+import java.nio.channels.ReadableByteChannel;
+
+public class TCPDownloadFile implements Test {
+
+    @Override
+    public boolean run() {
+        try {
+            URL website = new URL("http://212.58.244.66/");
+            ReadableByteChannel rbc = Channels.newChannel(website.openStream());
+            FileOutputStream fos = new FileOutputStream("/tmp/bbc.co.uk.html");
+            fos.getChannel().transferFrom(rbc, 0, 1 << 24);
+            fos.close();
+        } catch (Exception ex) {
+            ex.printStackTrace();
+            return (false);
+        }
+        return (true);
+    }
+    
+
+}

java/cli/com/cloudius/cli/tests/TestRunner.java

@@ -66,6 +66,7 @@ public class TestRunner extends ScriptableObject {
     public void registerAllTests() {
         this.register("TCPEchoServerTest", new TCPEchoServerTest());
         this.register("TCPExternalCommunication", new TCPExternalCommunication());
+        this.register("TCPDownloadFile", new TCPDownloadFile());
         this.registerELFTests();
     }