/*
* Copyright 2009 Ralf Joachim, Ahmad Hassan
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.castor.cpa.persistence.sql.query.condition;
import junit.framework.TestCase;
import org.castor.cpa.persistence.sql.query.expression.Column;
import org.castor.cpa.persistence.sql.query.expression.Expression;
/**
* Test if Predicate works as expected.
*
* @author <a href="mailto:ahmad DOT hassan AT gmail DOT com">Ahmad Hassan</a>
* @author <a href="mailto:ralf DOT joachim AT syscon DOT eu">Ralf Joachim</a>
* @version $Revision$ $Date: 2009-07-13 17:22:43 (Mon, 13 Jul 2009) $
*/
public final class TestIsNullPredicate extends TestCase {
public void testExtendsHierarchy() {
assertTrue(Predicate.class.isAssignableFrom(IsNullPredicate.class));
}
public void testConstructorName() {
Expression expression = new Column("mycolumn");
Predicate predicate = null;
try {
predicate = new IsNullPredicate(null);
fail("should throw NullPointerException");
} catch (NullPointerException ex) {
assertNull(predicate);
} catch (Exception ex) {
fail("should throw NullPointerException");
}
try {
predicate = new IsNullPredicate(null, true);
fail("should throw NullPointerException");
} catch (NullPointerException ex) {
assertNull(predicate);
} catch (Exception ex) {
fail("should throw NullPointerException");
}
try {
predicate = new IsNullPredicate(expression);
assertEquals(expression, predicate.expression());
assertTrue(predicate.evaluateTo());
assertEquals("mycolumn IS NULL", predicate.toString());
predicate = new IsNullPredicate(expression, true);
assertEquals(expression, predicate.expression());
assertTrue(predicate.evaluateTo());
assertEquals("mycolumn IS NULL", predicate.toString());
predicate = new IsNullPredicate(expression, false);
assertEquals(expression, predicate.expression());
assertFalse(predicate.evaluateTo());
assertEquals("mycolumn IS NOT NULL", predicate.toString());
} catch (Exception ex) {
fail("should not throw exception");
}
}
}