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POHow better to test multithreading program with common queue?
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copied!<p>Which way should be better to use when one needs to test this program.<br> Firstly <code>askUserPathAndWord()</code> asks the user to input <code>path</code> and <code>whatFind</code>. We have two threads: </p> <ul> <li>First thread scans folder and if it finds readable files <code>put()</code> it in the queue. </li> <li>Second thread <code>take()</code>s from the queue and looks for <code>whatFind</code> into this file. If the search is successful it outputs to console the path of this file and the frequency of the word.</li> </ul> <p>This is an integration dependence with multithreading work. Which variant is better able to test this program - Junit of EasyMock? I read some tutorials about EasyMock, but I don't know in which cases it is better to use it.</p> <p><strong>Code:</strong></p> <pre><code>class FolderScan implements Runnable { private String path; private BlockingQueue<File> queue; private CountDownLatch latch; private File endOfWorkFile; FolderScan(String path, BlockingQueue<File> queue, CountDownLatch latch, File endOfWorkFile) { this.path = path; this.queue = queue; this.latch = latch; this.endOfWorkFile = endOfWorkFile; } public FolderScan() { } @Override public void run() { findFiles(path); queue.add(endOfWorkFile); latch.countDown(); } private void findFiles(String path) { try { File root = new File(path); File[] list = root.listFiles(); for (File currentFile : list) { String s = currentFile.getName().toLowerCase(); if (currentFile.isDirectory()) { findFiles(currentFile.getAbsolutePath()); } else { if (s.matches("^.*?\\.(txt|pdf|doc|docx|html|htm|xml|djvu|rar|rtf)$")) { queue.put(currentFile); } } } } catch (InterruptedException e) { e.printStackTrace(); } } } public class FileScan implements Runnable { private String whatFind; private BlockingQueue<File> queue; private CountDownLatch latch; private File endOfWorkFile; public FileScan(String whatFind, BlockingQueue<File> queue, CountDownLatch latch, File endOfWorkFile) { this.whatFind = whatFind; this.queue = queue; this.latch = latch; this.endOfWorkFile = endOfWorkFile; } public FileScan() { } @Override public void run() { while (true) { try { File file; file = queue.take(); if (file == endOfWorkFile) { break; } scan(file); } catch (InterruptedException e) { e.printStackTrace(); } } latch.countDown(); } private void scan(File file) { Scanner scanner = null; int matches = 0; try { scanner = new Scanner(file); } catch (FileNotFoundException e) { System.out.println("File Not Found."); e.printStackTrace(); } while (scanner.hasNext()) if (scanner.next().equals(whatFind)) { matches++; } if (matches > 0) { String myStr = String.format( "File: %s - and the number of matches " + "is: %d", file.getAbsolutePath(), matches); System.out.println(myStr); } } public void askUserPathAndWord() { BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(System.in)); String path; String whatFind; BlockingQueue<File> queue = new LinkedBlockingQueue<File>(); try { System.out.println("Please, enter a Path and Word" + "(which you want to find):"); System.out.println("Please enter a Path:"); path = bufferedReader.readLine(); System.out.println("Please enter a Word:"); whatFind = bufferedReader.readLine(); if (path != null && whatFind != null) { File endOfWorkFile = new File("GameOver.tmp"); CountDownLatch latch = new CountDownLatch(2); FolderScan folderScan = new FolderScan(path, queue, latch, endOfWorkFile); FileScan fileScan = new FileScan(whatFind, queue, latch, endOfWorkFile); Executor executor = Executors.newCachedThreadPool(); executor.execute(folderScan); executor.execute(fileScan); latch.await(); System.out.println("Thank you!"); } else { System.out.println("You did not enter anything"); } } catch (IOException | RuntimeException e) { System.out.println("Wrong input!"); e.printStackTrace(); } catch (InterruptedException e) { System.out.println("Interrupted."); e.printStackTrace(); } } public static void main(String[] args) { new FileScan().askUserPathAndWord(); } } </code></pre> <p><strong>Questions:</strong> </p> <ul> <li>Which kind of test will have best coverage in this case? </li> <li>How better to test contractual obligations in both variants?</li> <li>If the answer is <code>EasyMock</code>, how should we do this correctly?</li> <li>If <code>Junit</code>, how do we test <code>void</code> methods?</li> </ul>

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