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/*
* Copyright 2002-2018 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.test.web;
import java.util.Comparator;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.springframework.util.ObjectUtils;
import org.springframework.web.servlet.ModelAndView;
import static org.springframework.test.util.AssertionErrors.*;
/**
* A collection of assertions intended to simplify testing scenarios dealing
* with Spring Web MVC {@link org.springframework.web.servlet.ModelAndView
* ModelAndView} objects.
*
* Intended for use with JUnit 4 and TestNG. All {@code assert*()} methods
* throw {@link AssertionError}s.
*
* @author Sam Brannen
* @author Alef Arendsen
* @author Bram Smeets
* @since 2.5
* @see org.springframework.web.servlet.ModelAndView
*/
public abstract class ModelAndViewAssert {
/**
* Checks whether the model value under the given {@code modelName}
* exists and checks it type, based on the {@code expectedType}. If the
* model entry exists and the type matches, the model value is returned.
* @param mav ModelAndView to test against (never {@code null})
* @param modelName name of the object to add to the model (never {@code null})
* @param expectedType expected type of the model value
* @return the model value
*/
@SuppressWarnings("unchecked")
public static T assertAndReturnModelAttributeOfType(ModelAndView mav, String modelName, Class expectedType) {
Map model = mav.getModel();
Object obj = model.get(modelName);
if (obj == null) {
fail("Model attribute with name '" + modelName + "' is null");
}
assertTrue("Model attribute is not of expected type '" + expectedType.getName() + "' but rather of type '" +
obj.getClass().getName() + "'", expectedType.isAssignableFrom(obj.getClass()));
return (T) obj;
}
/**
* Compare each individual entry in a list, without first sorting the lists.
* @param mav ModelAndView to test against (never {@code null})
* @param modelName name of the object to add to the model (never {@code null})
* @param expectedList the expected list
*/
@SuppressWarnings("rawtypes")
public static void assertCompareListModelAttribute(ModelAndView mav, String modelName, List expectedList) {
List modelList = assertAndReturnModelAttributeOfType(mav, modelName, List.class);
assertTrue("Size of model list is '" + modelList.size() + "' while size of expected list is '" +
expectedList.size() + "'", expectedList.size() == modelList.size());
assertTrue("List in model under name '" + modelName + "' is not equal to the expected list.",
expectedList.equals(modelList));
}
/**
* Assert whether or not a model attribute is available.
* @param mav ModelAndView to test against (never {@code null})
* @param modelName name of the object to add to the model (never {@code null})
*/
public static void assertModelAttributeAvailable(ModelAndView mav, String modelName) {
Map model = mav.getModel();
assertTrue("Model attribute with name '" + modelName + "' is not available", model.containsKey(modelName));
}
/**
* Compare a given {@code expectedValue} to the value from the model
* bound under the given {@code modelName}.
* @param mav ModelAndView to test against (never {@code null})
* @param modelName name of the object to add to the model (never {@code null})
* @param expectedValue the model value
*/
public static void assertModelAttributeValue(ModelAndView mav, String modelName, Object expectedValue) {
Object modelValue = assertAndReturnModelAttributeOfType(mav, modelName, Object.class);
assertTrue("Model value with name '" + modelName + "' is not the same as the expected value which was '" +
expectedValue + "'", modelValue.equals(expectedValue));
}
/**
* Inspect the {@code expectedModel} to see if all elements in the
* model appear and are equal.
* @param mav ModelAndView to test against (never {@code null})
* @param expectedModel the expected model
*/
public static void assertModelAttributeValues(ModelAndView mav, Map expectedModel) {
Map model = mav.getModel();
if (!model.keySet().equals(expectedModel.keySet())) {
StringBuilder sb = new StringBuilder("Keyset of expected model does not match.\n");
appendNonMatchingSetsErrorMessage(expectedModel.keySet(), model.keySet(), sb);
fail(sb.toString());
}
StringBuilder sb = new StringBuilder();
model.forEach((modelName, mavValue) -> {
Object assertionValue = expectedModel.get(modelName);
if (!assertionValue.equals(mavValue)) {
sb.append("Value under name '").append(modelName).append("' differs, should have been '").append(
assertionValue).append("' but was '").append(mavValue).append("'\n");
}
});
if (sb.length() != 0) {
sb.insert(0, "Values of expected model do not match.\n");
fail(sb.toString());
}
}
/**
* Compare each individual entry in a list after having sorted both lists
* (optionally using a comparator).
* @param mav ModelAndView to test against (never {@code null})
* @param modelName name of the object to add to the model (never {@code null})
* @param expectedList the expected list
* @param comparator the comparator to use (may be {@code null}). If not
* specifying the comparator, both lists will be sorted not using any comparator.
*/
@SuppressWarnings({"unchecked", "rawtypes"})
public static void assertSortAndCompareListModelAttribute(
ModelAndView mav, String modelName, List expectedList, Comparator comparator) {
List modelList = assertAndReturnModelAttributeOfType(mav, modelName, List.class);
assertTrue("Size of model list is '" + modelList.size() + "' while size of expected list is '" +
expectedList.size() + "'", expectedList.size() == modelList.size());
modelList.sort(comparator);
expectedList.sort(comparator);
assertTrue("List in model under name '" + modelName + "' is not equal to the expected list.",
expectedList.equals(modelList));
}
/**
* Check to see if the view name in the ModelAndView matches the given
* {@code expectedName}.
* @param mav ModelAndView to test against (never {@code null})
* @param expectedName the name of the model value
*/
public static void assertViewName(ModelAndView mav, String expectedName) {
assertTrue("View name is not equal to '" + expectedName + "' but was '" + mav.getViewName() + "'",
ObjectUtils.nullSafeEquals(expectedName, mav.getViewName()));
}
private static void appendNonMatchingSetsErrorMessage(
Set assertionSet, Set incorrectSet, StringBuilder sb) {
Set tempSet = new HashSet<>(incorrectSet);
tempSet.removeAll(assertionSet);
if (!tempSet.isEmpty()) {
sb.append("Set has too many elements:\n");
for (Object element : tempSet) {
sb.append('-');
sb.append(element);
sb.append('\n');
}
}
tempSet = new HashSet<>(assertionSet);
tempSet.removeAll(incorrectSet);
if (!tempSet.isEmpty()) {
sb.append("Set is missing elements:\n");
for (Object element : tempSet) {
sb.append('-');
sb.append(element);
sb.append('\n');
}
}
}
}