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more test coverage of obscure situations 

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/lang/trunk@138003 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Henri Yandell 2004-12-25 17:52:19 +00:00
parent 57b94c34ea
commit bcd86e7fbe
1 changed files with 44 additions and 3 deletions
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47
src/test/org/apache/commons/lang/math/RandomUtilsTest.java
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@ -25,7 +25,7 @@ import junit.framework.TestSuite;
* Test cases for the {@link RandomUtils} class. * Test cases for the {@link RandomUtils} class.
* *
* @author <a href="mailto:phil@steitz.com">Phil Steitz</a> * @author <a href="mailto:phil@steitz.com">Phil Steitz</a>
* @version $Revision: 1.7 $ $Date: 2004/02/18 23:02:38 $ * @version $Revision: 1.8 $ $Date: 2004/12/25 17:52:19 $
*/ */
public final class RandomUtilsTest extends TestCase { public final class RandomUtilsTest extends TestCase {
@ -55,6 +55,12 @@ public final class RandomUtilsTest extends TestCase {
tstNextInt(rnd); tstNextInt(rnd);
} }
/** test distribution of JVMRandom.nextInt() */
public void testJvmRandomNextInt() {
tstNextInt(RandomUtils.JVM_RANDOM);
}
/** /**
* Generate 1000 values for nextInt(bound) and compare * Generate 1000 values for nextInt(bound) and compare
* the observed frequency counts to expected counts using * the observed frequency counts to expected counts using
@ -268,14 +274,49 @@ public final class RandomUtilsTest extends TestCase {
chiSquare(expected,observed) < 10.83); chiSquare(expected,observed) < 10.83);
} }
/** make sure that setSeed fails */ /** make sure that unimplemented methods fail */
public void testSetSeed() { public void testUnimplementedMethods() {
try { try {
RandomUtils.JVM_RANDOM.setSeed(1000); RandomUtils.JVM_RANDOM.setSeed(1000);
fail("expecting UnsupportedOperationException"); fail("expecting UnsupportedOperationException");
} catch (UnsupportedOperationException ex) { } catch (UnsupportedOperationException ex) {
// empty // empty
} }
try {
RandomUtils.JVM_RANDOM.nextGaussian();
fail("expecting UnsupportedOperationException");
} catch (UnsupportedOperationException ex) {
// empty
}
try {
RandomUtils.JVM_RANDOM.nextBytes(null);
fail("expecting UnsupportedOperationException");
} catch (UnsupportedOperationException ex) {
// empty
}
}
/** make sure that illegal arguments fail */
public void testIllegalArguments() {
try {
RandomUtils.JVM_RANDOM.nextInt(-1);
fail("expecting IllegalArgumentException");
} catch (IllegalArgumentException ex) {
// empty
}
try {
JVMRandom.nextLong( -1L );
fail("expecting IllegalArgumentException");
} catch (IllegalArgumentException ex) {
// empty
}
} }
/** /**