1 import org.junit.*;
    2 import static org.junit.Assert.*;
    3 
    4 public class JUnitMathTest {
    5     /** Our margin for round-off errors -- this approach is only acceptable in a toy example! */
    6     private static double TOLERANCE = = 0.00000000001;
    7 
    8     @Test
    9     public void test1() {
   10         /* What we're testing in this method */
   11         final String TESTWHAT = "test 1:  sqrt(45) * sqrt(45) should be close to 45";
   12         
   13         double x = 45;
   14         assertFalse(TESTWHAT, Math.abs((Math.sqrt(x) * Math.sqrt(x)) - x) > TOLERANCE);
   15     }
   16 }