spring ModelAndViewResolverMethodReturnValueHandlerTests 源码

spring ModelAndViewResolverMethodReturnValueHandlerTests 代码

文件路径：/spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/ModelAndViewResolverMethodReturnValueHandlerTests.java

/*
 * Copyright 2002-2019 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
 *
 *      https://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.web.servlet.mvc.method.annotation;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import org.springframework.beans.testfixture.beans.TestBean;
import org.springframework.core.MethodParameter;
import org.springframework.ui.ExtendedModelMap;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.context.request.ServletWebRequest;
import org.springframework.web.method.support.ModelAndViewContainer;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.annotation.ModelAndViewResolver;
import org.springframework.web.testfixture.servlet.MockHttpServletRequest;

import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatExceptionOfType;

/**
 * Test fixture with {@link ModelAndViewResolverMethodReturnValueHandler}.
 *
 * @author Rossen Stoyanchev
 */
public class ModelAndViewResolverMethodReturnValueHandlerTests {

	private ModelAndViewResolverMethodReturnValueHandler handler;

	private List<ModelAndViewResolver> mavResolvers;

	private ModelAndViewContainer mavContainer;

	private ServletWebRequest request;


	@BeforeEach
	public void setup() {
		mavResolvers = new ArrayList<>();
		handler = new ModelAndViewResolverMethodReturnValueHandler(mavResolvers);
		mavContainer = new ModelAndViewContainer();
		request = new ServletWebRequest(new MockHttpServletRequest());
	}


	@Test
	public void modelAndViewResolver() throws Exception {
		MethodParameter returnType = new MethodParameter(getClass().getDeclaredMethod("testBeanReturnValue"), -1);
		mavResolvers.add(new TestModelAndViewResolver(TestBean.class));
		TestBean testBean = new TestBean("name");

		handler.handleReturnValue(testBean, returnType, mavContainer, request);

		assertThat(mavContainer.getViewName()).isEqualTo("viewName");
		assertThat(mavContainer.getModel().get("modelAttrName")).isSameAs(testBean);
		assertThat(mavContainer.isRequestHandled()).isFalse();
	}

	@Test
	public void modelAndViewResolverUnresolved() throws Exception {
		MethodParameter returnType = new MethodParameter(getClass().getDeclaredMethod("intReturnValue"), -1);
		mavResolvers.add(new TestModelAndViewResolver(TestBean.class));
		assertThatExceptionOfType(UnsupportedOperationException.class).isThrownBy(() ->
				handler.handleReturnValue(99, returnType, mavContainer, request));
	}

	@Test
	public void handleNull() throws Exception {
		MethodParameter returnType = new MethodParameter(getClass().getDeclaredMethod("testBeanReturnValue"), -1);
		handler.handleReturnValue(null, returnType, mavContainer, request);

		assertThat(mavContainer.getView()).isNull();
		assertThat(mavContainer.getViewName()).isNull();
		assertThat(mavContainer.getModel().isEmpty()).isTrue();
	}

	@Test
	public void handleSimpleType() throws Exception {
		MethodParameter returnType = new MethodParameter(getClass().getDeclaredMethod("intReturnValue"), -1);
		assertThatExceptionOfType(UnsupportedOperationException.class).isThrownBy(() ->
					handler.handleReturnValue(55, returnType, mavContainer, request));
	}

	@Test
	public void handleNonSimpleType() throws Exception{
		MethodParameter returnType = new MethodParameter(getClass().getDeclaredMethod("testBeanReturnValue"), -1);
		handler.handleReturnValue(new TestBean(), returnType, mavContainer, request);

		assertThat(mavContainer.containsAttribute("testBean")).isTrue();
	}


	@SuppressWarnings("unused")
	private int intReturnValue() {
		return 0;
	}

	@SuppressWarnings("unused")
	private TestBean testBeanReturnValue() {
		return null;
	}


	private static class TestModelAndViewResolver implements ModelAndViewResolver {

		private final Class<?> returnValueType;

		public TestModelAndViewResolver(Class<?> returnValueType) {
			this.returnValueType = returnValueType;
		}

		@Override
		public ModelAndView resolveModelAndView(Method method, Class<?> handlerType, Object returnValue,
				ExtendedModelMap model, NativeWebRequest request) {

			if (returnValue != null && returnValue.getClass().equals(returnValueType)) {
				return new ModelAndView("viewName", "modelAttrName", returnValue);
			}
			else {
				return ModelAndViewResolver.UNRESOLVED;
			}
		}
	}

}

相关信息

spring 源码目录

相关文章

spring AbstractRequestAttributesArgumentResolverTests 源码

spring AbstractServletHandlerMethodTests 源码

spring CrossOriginTests 源码

spring DeferredResultReturnValueHandlerTests 源码

spring ExceptionHandlerExceptionResolverTests 源码

spring ExtendedServletRequestDataBinderTests 源码

spring HandlerMethodAnnotationDetectionTests 源码

spring HttpEntityMethodProcessorMockTests 源码

spring HttpEntityMethodProcessorTests 源码

spring MatrixVariablesMapMethodArgumentResolverTests 源码