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Added tests for equals and hashcode. 

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/math/trunk@141304 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Phil Steitz 2004-06-17 22:33:23 +00:00
parent d4a4d302a2
commit f80d05b493
1 changed files with 55 additions and 1 deletions
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56
src/test/org/apache/commons/math/stat/univariate/StorelessUnivariateStatisticAbstractTest.java
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@ -19,7 +19,7 @@ import org.apache.commons.math.TestUtils;
/** /**
* Test cases for the {@link UnivariateStatistic} class. * Test cases for the {@link UnivariateStatistic} class.
* @version $Revision: 1.12 $ $Date: 2004/04/27 16:42:32 $ * @version $Revision: 1.13 $ $Date: 2004/06/17 22:33:23 $
*/ */
public abstract class StorelessUnivariateStatisticAbstractTest public abstract class StorelessUnivariateStatisticAbstractTest
extends UnivariateStatisticAbstractTest { extends UnivariateStatisticAbstractTest {
@ -28,10 +28,13 @@ public abstract class StorelessUnivariateStatisticAbstractTest
super(name); super(name);
} }
/** Return a new instance of the statistic */
public abstract UnivariateStatistic getUnivariateStatistic(); public abstract UnivariateStatistic getUnivariateStatistic();
/**Expected value for the testArray defined in UnivariateStatisticAbstractTest */
public abstract double expectedValue(); public abstract double expectedValue();
/** Verify that calling increment() in a loop over testArray results in correct state */
public void testIncrementation() throws Exception { public void testIncrementation() throws Exception {
StorelessUnivariateStatistic statistic = StorelessUnivariateStatistic statistic =
@ -44,6 +47,7 @@ public abstract class StorelessUnivariateStatisticAbstractTest
} }
assertEquals(expectedValue(), statistic.getResult(), getTolerance()); assertEquals(expectedValue(), statistic.getResult(), getTolerance());
//TODO: add test for getN() once type is fixed
statistic.clear(); statistic.clear();
@ -56,6 +60,8 @@ public abstract class StorelessUnivariateStatisticAbstractTest
StorelessUnivariateStatistic statistic = StorelessUnivariateStatistic statistic =
(StorelessUnivariateStatistic) getUnivariateStatistic(); (StorelessUnivariateStatistic) getUnivariateStatistic();
TestUtils.checkSerializedEquality(statistic);
statistic.clear(); statistic.clear();
for (int i = 0; i < testArray.length; i++) { for (int i = 0; i < testArray.length; i++) {
@ -64,6 +70,8 @@ public abstract class StorelessUnivariateStatisticAbstractTest
statistic = (StorelessUnivariateStatistic)TestUtils.serializeAndRecover(statistic); statistic = (StorelessUnivariateStatistic)TestUtils.serializeAndRecover(statistic);
} }
TestUtils.checkSerializedEquality(statistic);
assertEquals(expectedValue(), statistic.getResult(), getTolerance()); assertEquals(expectedValue(), statistic.getResult(), getTolerance());
statistic.clear(); statistic.clear();
@ -72,4 +80,50 @@ public abstract class StorelessUnivariateStatisticAbstractTest
} }
public void testEqualsAndHashCode() {
StorelessUnivariateStatistic statistic =
(StorelessUnivariateStatistic) getUnivariateStatistic();
StorelessUnivariateStatistic statistic2 = null;
assertTrue("non-null, compared to null", !statistic.equals(statistic2));
assertTrue("reflexive, non-null", statistic.equals(statistic));
int emptyHash = statistic.hashCode();
statistic2 = (StorelessUnivariateStatistic) getUnivariateStatistic();
assertTrue("empty stats should be equal", statistic.equals(statistic2));
assertEquals("empty stats should have the same hashcode",
emptyHash, statistic2.hashCode());
statistic.increment(1d);
assertTrue("reflexive, non-empty", statistic.equals(statistic));
assertTrue("non-empty, compared to empty", !statistic.equals(statistic2));
assertTrue("non-empty, compared to empty", !statistic2.equals(statistic));
assertTrue("non-empty stat should have different hashcode from empty stat",
statistic.hashCode() != emptyHash);
statistic2.increment(1d);
assertTrue("stats with same data should be equal", statistic.equals(statistic2));
assertEquals("stats with same data should have the same hashcode",
statistic.hashCode(), statistic2.hashCode());
statistic.increment(Double.POSITIVE_INFINITY);
assertTrue("stats with different n's should not be equal", !statistic2.equals(statistic));
assertTrue("stats with different n's should have different hashcodes",
statistic.hashCode() != statistic2.hashCode());
statistic2.increment(Double.POSITIVE_INFINITY);
assertTrue("stats with same data should be equal", statistic.equals(statistic2));
assertEquals("stats with same data should have the same hashcode",
statistic.hashCode(), statistic2.hashCode());
statistic.clear();
statistic2.clear();
assertTrue("cleared stats should be equal", statistic.equals(statistic2));
assertEquals("cleared stats should have thashcode of empty stat",
emptyHash, statistic2.hashCode());
assertEquals("cleared stats should have thashcode of empty stat",
emptyHash, statistic.hashCode());
}
} }