org.zkybase.cmdb.test.AbstractBeanTestCase.java Source code

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Here is the source code for org.zkybase.cmdb.test.AbstractBeanTestCase.java

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/* 
 * Copyright 2011-2012 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.zkybase.cmdb.test;

import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertSame;

import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.util.HashMap;
import java.util.Map;

import org.junit.Before;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeanUtils;

/**
 * @author Willie Wheeler (willie.wheeler@gmail.com)
 */
public abstract class AbstractBeanTestCase<T> {
    private static final Map<Class<?>, Object> dummyValues = new HashMap<Class<?>, Object>();
    private static final Logger log = LoggerFactory.getLogger(AbstractBeanTestCase.class);

    private final Class<T> beanClass;

    private T bean;

    static {
        dummyValues.put(Double.class, 0.0);
        dummyValues.put(Integer.class, 0);
        dummyValues.put(Float.class, 0.0f);
        dummyValues.put(Long.class, 0L);
    }

    @SuppressWarnings("unchecked")
    public AbstractBeanTestCase() {
        ParameterizedType superclass = (ParameterizedType) getClass().getGenericSuperclass();
        this.beanClass = (Class<T>) superclass.getActualTypeArguments()[0];
    }

    @Before
    public void setUp() throws Exception {
        this.bean = beanClass.newInstance();
    }

    @Test
    public void accessors() throws Exception {
        PropertyDescriptor[] props = BeanUtils.getPropertyDescriptors(beanClass);
        for (PropertyDescriptor prop : props) {
            String propName = prop.getName();
            if ("class".equals(propName)) {
                continue;
            }

            log.debug("Testing property accessors: {}.{}", beanClass, prop.getName());
            Method readMethod = prop.getReadMethod();
            Method writeMethod = prop.getWriteMethod();

            assertNull(readMethod.invoke(bean));
            Object dummyValue = getDummyValue(prop.getPropertyType());
            writeMethod.invoke(bean, dummyValue);
            assertSame(dummyValue, readMethod.invoke(bean));
        }
    }

    private Object getDummyValue(Class<?> propType) throws Exception {
        Object dummyValue = dummyValues.get(propType);
        return (dummyValue == null ? propType.newInstance() : dummyValue);
    }

    @Test
    public void testToString() {
        assertNotNull(bean.toString());
    }
}