package org.junit.tests.junit3compatibility;
   
   import java.io.ByteArrayOutputStream;
   import java.io.OutputStream;
   import java.io.PrintStream;
   
   import junit.framework.JUnit4TestAdapter;
   import junit.framework.TestCase;
   import junit.framework.TestResult;
  import junit.framework.TestSuite;
  import junit.textui.ResultPrinter;
  import junit.textui.TestRunner;
  import org.junit.Assert;
  import org.junit.Test;
  
  public class ForwardCompatibilityPrintingTest extends TestCase {
      static class TestResultPrinter extends ResultPrinter {
          TestResultPrinter(PrintStream writer) {
              super(writer);
          }
  
          /*
             * Spoof printing time so the tests are deterministic
             */
          @Override
          protected String elapsedTimeAsString(long runTime) {
              return "0";
          }
      }
  
      public void testError() {
          ByteArrayOutputStream output = new ByteArrayOutputStream();
          TestRunner runner = new TestRunner(new TestResultPrinter(
                  new PrintStream(output)));
  
          String expected = expected(new String[]{".E", "Time: 0",
                  "Errors here", "", "FAILURES!!!",
                  "Tests run: 1,  Failures: 0,  Errors: 1", ""});
          ResultPrinter printer = new TestResultPrinter(new PrintStream(output)) {
              @Override
              public void printErrors(TestResult result) {
                  getWriter().println("Errors here");
              }
          };
          runner.setPrinter(printer);
          TestSuite suite = new TestSuite();
          suite.addTest(new TestCase() {
              @Override
              public void runTest() throws Exception {
                  throw new Exception();
              }
          });
          runner.doRun(suite);
          assertEquals(expected, output.toString());
      }
  
      public static class ATest {
          @Test
          public void error() {
              Assert.fail();
          }
      }
  
      public void testErrorAdapted() {
          ByteArrayOutputStream output = new ByteArrayOutputStream();
          TestRunner runner = new TestRunner(new TestResultPrinter(
                  new PrintStream(output)));
  
          String expected = expected(new String[]{".E", "Time: 0",
                  "Errors here", "", "FAILURES!!!",
                  "Tests run: 1,  Failures: 0,  Errors: 1", ""});
          ResultPrinter printer = new TestResultPrinter(new PrintStream(output)) {
              @Override
              public void printErrors(TestResult result) {
                  getWriter().println("Errors here");
              }
          };
          runner.setPrinter(printer);
          runner.doRun(new JUnit4TestAdapter(ATest.class));
          assertEquals(expected, output.toString());
      }
  
      private String expected(String[] lines) {
          OutputStream expected = new ByteArrayOutputStream();
          PrintStream expectedWriter = new PrintStream(expected);
          for (int i = 0; i < lines.length; i++) {
              expectedWriter.println(lines[i]);
          }
          return expected.toString();
      }
  }