/**************************************************************************
    *
    * Copyright (c) 2018-2019 Yawg project contributors.
    *
    **************************************************************************/
   
   package com.varmateo.testutils;
   
   import org.junit.rules.TestRule;
  import org.junit.runner.Description;
  import org.junit.runners.model.Statement;
  
  
  /**
   *
   */
  public final class LogStartAndEndRule implements TestRule {
  
      private static final String MSG_START = "%n>>>>>> START - %s <<<<<<";
      private static final String MSG_END = ">>>>>> END - %s (%.3f ms) <<<<<<";
  
      /**
       *
       */
      @Override
      public Statement apply(
              final Statement base,
              final Description description) {
  
          return new Statement() {
              @Override
              public void evaluate()
                      throws Throwable {
                  runTest(base, description);
              }
          };
      }
  
  
      private void runTest(
              final Statement base,
              final Description description)
              throws Throwable {
  
          long startTime = System.nanoTime();
          String testName = description.getMethodName();
          Throwable error = null;
  
          String startMsg = String.format(MSG_START, testName);
  
          System.out.println(startMsg);
  
          try {
              base.evaluate();
          } catch ( Throwable e ) {
              error = e;
          }
  
          long durationNanos = System.nanoTime() - startTime;
          double durationMillis = durationNanos / 1_000_000.0;
          String endMsg = String.format(MSG_END, testName, durationMillis);
  
          System.out.println(endMsg);
  
          if ( error != null ) {
              throw error;
          }
      }
  
  }