doubleprecisionasserttest.java

JUnit, java testing tool

package junit.tests.framework;

import junit.framework.AssertionFailedError;
import junit.framework.TestCase;

public class DoublePrecisionAssertTest extends TestCase {

	/**
		 * Test for the special Double.NaN value.
		 */
	public void testAssertEqualsNaNFails() {
		try {
			assertEquals(1.234, Double.NaN, 0.0);
			fail();
		} catch (AssertionFailedError e) {
		}
	}

	public void testAssertNaNEqualsFails() {
		try {
			assertEquals(Double.NaN, 1.234, 0.0);
			fail();
		} catch (AssertionFailedError e) {
		}
	}

	public void testAssertNaNEqualsNaN() {
		assertEquals(Double.NaN, Double.NaN, 0.0);
	}

	public void testAssertPosInfinityNotEqualsNegInfinity() {
		try {
			assertEquals(Double.POSITIVE_INFINITY, Double.NEGATIVE_INFINITY, 0.0);
			fail();
		} catch (AssertionFailedError e) {
		}
	}

	public void testAssertPosInfinityNotEquals() {
		try {
			assertEquals(Double.POSITIVE_INFINITY, 1.23, 0.0);
			fail();
		} catch (AssertionFailedError e) {
		}
	}

	public void testAssertPosInfinityEqualsInfinity() {
		assertEquals(Double.POSITIVE_INFINITY, Double.POSITIVE_INFINITY, 0.0);
	}

	public void testAssertNegInfinityEqualsInfinity() {
		assertEquals(Double.NEGATIVE_INFINITY, Double.NEGATIVE_INFINITY, 0.0);
	}

}