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package org.references;

import org.testng.*;
import org.testng.AssertJUnit.*;
import org.testng.annotations.Test;


public class NewTest
{

        @Test
        public void f() {
                AssertJUnit.assertTrue( 1 == 2 );
                assertTrue( 1 == 2 );// compiler error: The method assertTrue(boolean) is undefined for the type NewTest
        }
}

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public class AssertJUnit extends ArrayAsserts {

/**
   * Protect constructor since it is a static only class
   */
  protected AssertJUnit() {
  }

  /**
   * Asserts that a condition is true. If it isn't it throws
   * an AssertionFailedError with the given message.
   */
  static public void assertTrue(String message, boolean condition) {
    if(!condition) {
      fail(message);
    }
  }

...
}