/*
* Copyright 2009-2010 the original author or authors.
*
* 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.springframework.batch.item;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import org.junit.Before;
import org.junit.Test;
import org.springframework.batch.item.sample.Foo;
/**
* Common tests for {@link ItemReader} implementations. Expected input is five
* {@link Foo} objects with values 1 to 5.
*/
public abstract class AbstractItemReaderTests {
protected ItemReader<Foo> tested;
/**
* @return configured ItemReader ready for use.
*/
protected abstract ItemReader<Foo> getItemReader() throws Exception;
@Before
public void setUp() throws Exception {
tested = getItemReader();
}
/**
* Regular scenario - read the input and eventually return null.
*/
@Test
public void testRead() throws Exception {
Foo foo1 = tested.read();
assertEquals(1, foo1.getValue());
Foo foo2 = tested.read();
assertEquals(2, foo2.getValue());
Foo foo3 = tested.read();
assertEquals(3, foo3.getValue());
Foo foo4 = tested.read();
assertEquals(4, foo4.getValue());
Foo foo5 = tested.read();
assertEquals(5, foo5.getValue());
assertNull(tested.read());
}
/**
* Empty input should be handled gracefully - null is returned on first
* read.
*/
@Test
public void testEmptyInput() throws Exception {
pointToEmptyInput(tested);
tested.read();
assertNull(tested.read());
}
/**
* Point the reader to empty input (close and open if necessary for the new
* settings to apply).
*
* @param tested
* the reader
*/
protected abstract void pointToEmptyInput(ItemReader<Foo> tested)
throws Exception;
}