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ObjectGraphTraverserTest.java
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ObjectGraphTraverserTest.java
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package cz.cvut.kbss.jsonld.serialization.traversal;
import cz.cvut.kbss.jsonld.environment.Generator;
import cz.cvut.kbss.jsonld.environment.model.Employee;
import cz.cvut.kbss.jsonld.environment.model.Organization;
import cz.cvut.kbss.jsonld.environment.model.Person;
import cz.cvut.kbss.jsonld.environment.model.User;
import org.junit.Before;
import org.junit.Test;
import org.mockito.InOrder;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;
import java.lang.reflect.Field;
import java.util.Collections;
import java.util.HashSet;
import static org.mockito.Matchers.any;
import static org.mockito.Mockito.*;
public class ObjectGraphTraverserTest {
@Mock
private InstanceVisitor visitor;
private ObjectGraphTraverser traverser;
@Before
public void setUp() {
MockitoAnnotations.initMocks(this);
this.traverser = new ObjectGraphTraverser();
traverser.addVisitor(visitor);
}
@Test
public void traverseVisitsSerializableFieldsOfInstanceWithDataPropertiesOnly() throws Exception {
final User user = Generator.generateUser();
traverser.traverse(user);
final InOrder inOrder = inOrder(visitor);
// Verify that openInstance was called before visitField
inOrder.verify(visitor).openInstance(user);
inOrder.verify(visitor, atLeastOnce()).visitField(any(Field.class), any());
inOrder.verify(visitor).closeInstance(user);
verifyUserFieldsVisited(user);
}
private void verifyUserFieldsVisited(User user) throws NoSuchFieldException {
verify(visitor).visitField(Person.class.getDeclaredField("uri"), user.getUri());
verify(visitor).visitField(Person.class.getDeclaredField("firstName"), user.getFirstName());
verify(visitor).visitField(Person.class.getDeclaredField("lastName"), user.getLastName());
verify(visitor).visitField(User.class.getDeclaredField("username"), user.getUsername());
}
@Test
public void traverseTraversesObjectReferences() throws Exception {
final Employee employee = Generator.generateEmployee();
traverser.traverse(employee);
final InOrder inOrder = inOrder(visitor);
inOrder.verify(visitor).openInstance(employee);
inOrder.verify(visitor).openInstance(employee.getEmployer());
inOrder.verify(visitor).closeInstance(employee.getEmployer());
inOrder.verify(visitor).closeInstance(employee);
verifyUserFieldsVisited(employee);
verify(visitor).visitField(Employee.class.getDeclaredField("employer"), employee.getEmployer());
verify(visitor).visitField(Organization.class.getDeclaredField("uri"), employee.getEmployer().getUri());
verify(visitor).visitField(Organization.class.getDeclaredField("dateCreated"),
employee.getEmployer().getDateCreated());
verify(visitor).visitField(Organization.class.getDeclaredField("name"), employee.getEmployer().getName());
}
@Test
public void traverseTraversesObjectPropertyCollection() throws Exception {
final Organization org = Generator.generateOrganization();
generateEmployees(org);
traverser.traverse(org);
final InOrder inOrder = inOrder(visitor);
inOrder.verify(visitor).openInstance(org);
inOrder.verify(visitor).openCollection(org.getEmployees());
inOrder.verify(visitor).closeCollection(org.getEmployees());
inOrder.verify(visitor).closeInstance(org);
verify(visitor).openInstance(org);
org.getEmployees().forEach(e -> verify(visitor).openInstance(e));
}
private void generateEmployees(Organization org) {
org.setEmployees(new HashSet<>());
for (int i = 0; i < Generator.randomCount(10); i++) {
final Employee emp = new Employee();
emp.setUri(Generator.generateUri());
org.getEmployees().add(emp);
}
}
@Test
public void traverseRecognizesAlreadyVisitedInstances() throws Exception {
final Employee employee = Generator.generateEmployee();
// Backward reference
employee.getEmployer().setEmployees(Collections.singleton(employee));
traverser.traverse(employee);
verifyUserFieldsVisited(employee);
verify(visitor).openInstance(employee.getEmployer());
verify(visitor).openCollection(employee.getEmployer().getEmployees());
verify(visitor).visitKnownInstance(employee);
verify(visitor).closeCollection(employee.getEmployer().getEmployees());
verify(visitor).closeInstance(employee.getEmployer());
}
}