Fail?

TestNumberFormatting.java

import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.assertFalse;
import static org.hamcrest.Matchers.equalTo;

public class TestNumberFormatting {

    @Test
    public void testDetectRoundNumber() {
        double number = 2.2;
        assertFalse((int) Math.round(number) == number);
        
        number = 2;
        assertTrue((int) Math.round(number) == number);
    }
    
    @Test
    public void testWeirdnessTakeOne() {
        double number = 3.1415;
        boolean isRoundNumber = (int) Math.round(number) == number;
        assertFalse(isRoundNumber);
        
        String formattedString = String.valueOf(isRoundNumber ? (int) number : number);
        assertThat(formattedString, equalTo("3.1415"));
    }
    
    @Test
    public void testWeirdnessTakeTwo() {
        double number = 2.0;
        boolean isRoundNumber = (int) Math.round(number) == number;
        assertTrue(isRoundNumber);
        
        String formattedString = String.valueOf(isRoundNumber ? (int) number : number);
        assertThat(formattedString, equalTo("2"));
    }

}