I am new to testing.
I want to do unit testing with stub & mock in visual studio 2010.
Please provide any example or step by step guide for doing this.
Thanks
Here's example how to use Moq
public interface IService
{
string DoSomething(int i);
}
public class MyClass
{
private readonly IService service;
public MyClass(IService service)
{
this.service = service;
}
public string void Print()
{
var message = service.DoSomething();
Console.WriteLine(message );
return message;
}
}
[Test]
public void TestSomething()
{
var service = new Mock<IService>();
service.Setup(x => x.DoSomething(It.IsAny<int>())).Returns("bla-bla");
Assert.AreEqual("bla-bla", new MyClass(service).Print());
}
NUnit
nmock
Moq
DotNetMock
these open source tool all provide mock funciton.
Related
I am beginner in autofac and I have to use it in new legacy project asp.net web api.
I am registering of interface and injection works fine with constructor injection.
However, the constructor is being called in numerous places directly new(), and I don't want to replace it everywhere.
So I thought about property injection, but cannot get it to work, the dependency is always null.
The app is split into multiple projects and multiple autofac modules. Autofac configuration as per docs: https://docs.autofac.org/en/latest/integration/webapi.html
I tried to make small demo app, and I was able to get property injection working using all methods from docs: https://autofac.readthedocs.io/en/latest/register/prop-method-injection.html
using Autofac;
public class Program
{
public static void Main()
{
var builder = new ContainerBuilder();
builder.RegisterType<MyDependency>().As<IMyDependency>().SingleInstance();
builder.RegisterType<MyService>().OnActivated(e => e.Instance.MyDependency1 = e.Context.Resolve<IMyDependency>());
//builder.Register(c => new MyService { MyDependency1 = c.Resolve<IMyDependency>() });
//builder.RegisterType<MyService>().WithProperty("MyDependency1", new MyDependency()).SingleInstance();
var container = builder.Build();
container.Resolve<MyService>();
}
}
public class MyService
{
public IMyDependency MyDependency1 { get; set; }
}
public class MyDependency : IMyDependency
{
public void Hello()
{
Console.WriteLine("Hello from MyDependency1");
}
public MyDependency()
{
Hello();
}
}
public interface IMyDependency
{
public void Hello();
}
Unfortunately none of these works for my full project, the object is always null. I know it would be difficult to get help, but maybe someone can advice what to look for?
I just tried reproducing this using the WithProperty registration you have there and the test passes - I can't reproduce it, property injection is working.
If it's not working in your full project, something else is going on. Below is the totally working test I used to verify.
public class ExampleTests
{
[Fact]
public void PropertyInjection()
{
var builder = new ContainerBuilder();
builder.RegisterType<MyDependency>().As<IMyDependency>().SingleInstance();
builder.RegisterType<MyService>().WithProperty("MyDependency1", new MyDependency()).SingleInstance();
var container = builder.Build();
var svc = container.Resolve<MyService>();
Assert.NotNull(svc.MyDependency1);
}
}
public class MyService
{
public IMyDependency MyDependency1 { get; set; }
}
public class MyDependency : IMyDependency
{
public void Hello()
{
Console.WriteLine("Hello from MyDependency1");
}
public MyDependency()
{
Hello();
}
}
public interface IMyDependency
{
public void Hello();
}
I have a class like this
#Component
public class TestClass {
public void testMethod(){
FinalClass f = new FinalClass("string");
somePrivateMethod(f.getSomeString());
}
private void somePrivateMethod(String s){
}
}
As you can see it has a public method and private method. In public method it is instantiating an instance of FinalClass, which is a class in some third party library and it is final. Lets say it is like this
public final class FinalClass {
private final String someString;
public FinalClass(final String s) {
someString = s;
}
public String getSomeString() {
return someString;
}
}
And Now I am writing unit test for my test class. Since I have to verify final classes and private methods, I am using powermockito. And this is how my test class looks like
#RunWith(PowerMockRunner.class)
#PrepareForTest({TestClass.class, FinalClass.class})
public class TestClassTest {
private TestClass testClass;
private FinalClass finalClass;
#Before
public void setUp() {
finalClass = PowerMockito.mock(FinalClass.class);
testClass = spy(new TestClass());
}
#Test
public void testSomething() throws Exception {
whenNew(FinalClass.class).withAnyArguments().thenReturn(finalClass);
testClass.testMethod();
verifyNew(FinalClass.class);
//verifyPrivate(testClass).invoke("testMethod");
}
}
It works fine. But the problem is the last two statements verifyNew and verifyPrivate are working mutually exclusively. I mean when I comment one of those(doesn't matter which), the test passes. But when both are enabled, the test fails
Does anyone have any idea why this is happening?
I'm fiddling around with Mockito and Spring MVC. I'm trying to write unit tests for the code I've just written.
This is my CategoryService class:
#Service
public class CategoryService {
#Autowired
#Qualifier("categoryDaoImpl")
private CategoryDao categoryDao;
public void addCategory(Category category) {
category.setId(getLastCategoryId() + 1);
categoryDao.addCategory(category);
}
public Category getCategoryById(int id) {
return categoryDao.getCategoryById(id);
}
public List<Category> getCategories() {
return categoryDao.getAllCategories();
}
public int getCategoriesCount() {
return categoryDao.getCategoriesCount();
}
public int getLastCategoryId() {
if (categoryDao.getAllCategories().size() == 0) {
return 0;
}
return Collections.max(categoryDao.getAllCategories()).getId();
}
public CategoryDao getCategoryDao() {
return categoryDao;
}
public void setCategoryDao(CategoryDao categoryDao) {
this.categoryDao = categoryDao;
}
I've already tested CategoryDao with nearly 100% coverage.
And now I want to test CategoryService, but I have no idea how to test it, I mean methods like: addCategory, getCategoryById, getAllCategories, getCategoiesCount etc.
They're just talking to the DAO pattern, but what if another person changes its logic? I'd be glad if you told me or showed how to write a tests for such short methods.
As far as CategoryService is concerned, I only wrote tests for getLastCategoryId():
#Test
public void shouldGetLastCategoryIdWhenListIsEmpty() {
//given
List<Category> list = new ArrayList<Category>();
Mockito.when(categoryDao.getAllCategories()).thenReturn(list);
//when
int lastCategoryId = categoryService.getLastCategoryId();
//then
assertThat(lastCategoryId, is(0));
}
#Test
public void shouldGetLastCategoryIdWhenListIsNotEmpty() {
//given
List<Category> list = new ArrayList<Category>();
list.add(new Category(1, "a", "a"));
list.add(new Category(3, "a", "a"));
list.add(new Category(6, "a", "a"));
Mockito.when(categoryDao.getAllCategories()).thenReturn(list);
//when
int lastCategoryId = categoryService.getLastCategoryId();
//then
assertThat(lastCategoryId, is(6));
}
Thank you very much for help :)
Best regards,
Tom
You need to verify that the service methods behave as per their contracts even if they are modified in the future.
For e.g. The addCategory(Category c) method adds the category. This can be verified by verifying the categoryDao.addCategory() method is called with the category object that has the required properties set. In this case the id should be set to the lastCategoryId. Verifying could simply be done by create a spy of CategoryDao class (would be simpler then using third party libraries like mockito.
The test cases for getCategoryById(), getCategories() and getCategoriesCount() method could verify that the values returned are the ones returned by the dao.
I understand that this would mean just one test case per method, but these test cases just confirm that if there is more logic added in the service method implementation, the contract remains intact.
Here's one test case for addCategory()
public class CategoryServiceTest {
private CategoryService service;
private CategoryDaoSpy daoSpy;
#Before
public void setUp() {
service = new CategoryService();
daoSpy = new CategoryDaoSpy();
service.setCategoryDao(daoSpy);
}
#Test
public void shouldSaveCategoryWhenCategoryPassed() {
Category category = new Category();
service.addCategory(category);
assertEquals(daoSpy.getAddCategoryCallCount(), 1);
assertEquals(daoSpy.getCategories().size(), 1);
assertEquals(daoSpy.getCategories().get(0).getId(), 1);
}
}
public class CategoryDaoSpy extends CategoryDao {
private int addCategoryCallCount = 0;
private List<Category> categories = new ArrayList<>();
#Override
public void addCategory(Category category) {
this.addCategoryCallCount++;
categories.add(category);
}
public int getAddCategoryCallCount() {
return addCategoryCallCount;
}
public List<Category> getCategories() {
return categories;
}
#Override
public List<Category> getAllCategories() {
return Collections.emptyList();
}
}
I am trying to follow Josh Long - Philip Sorst example in order to perform Angular SPA-Rest Authentication and CRUD actions using Neo4J as db (excellent work. Thanks a lot guys). But I am stuck at a very early stage and I suspect it's not my fault. Please help Neo4J-Angular-Spring lovers. My code can be found here and it is very easy to run just clone and give mvn spring-boot:run
Now the problem is that I get the following exception only for the findAll() method of the GraphRepository.
Caused by: java.lang.NullPointerException: null
at org.neo4j.kernel.TopLevelTransaction.markAsRollbackOnly(TopLevelTransaction.java:93)
... 88 common frames omitted
and I will replicate some of my code:
Neo4JConfig.java
#Configuration
#EnableNeo4jRepositories(basePackages = "demo.repository.neo4j")
public class Neo4JConfig extends Neo4jConfiguration {
public Neo4JConfig() {
setBasePackage("demo.model.neo4j");
}
#Bean(destroyMethod = "shutdown")
public GraphDatabaseService graphDatabaseService() {
return new GraphDatabaseFactory().newEmbeddedDatabase("data/demo.db");
}
#Bean
public Neo4jTemplate neo4jTemplate() {
return new Neo4jTemplate(graphDatabaseService());
}
}
NewsEntry.java
#NodeEntity
public class NewsEntry {
#GraphId
private Long id;
private String content;
public NewsEntry() {}
public NewsEntry(String b) {
this.content = b;
}
public Long getId() {
return this.id;
}
public String getContent() {
return this.content;
}
public void setId(Long id) {
this.id = id;
}
public void setContent(String content) {
this.content = content;
}
}
NewsEntryRepository.java
public interface NewsEntryRepository extends GraphRepository<NewsEntry> {
}
NewsEntryController.java
#RestController
class NewsController {
#Autowired
private NewsEntryRepository newsEntryRepository;
#RequestMapping("/news")
List<NewsEntry> entries() {
List<NewsEntry> list = new ArrayList<NewsEntry>();
Iterable<NewsEntry> results = newsEntryRepository.findAll();
for (NewsEntry r : results) {
list.add(r);
}
return list;
}
#RequestMapping(value = "/news/{id}", method = RequestMethod.DELETE)
void remove(#PathVariable Long id) {
this.newsEntryRepository.delete(id);
return;
}
#RequestMapping(value = "/news/{id}", method = RequestMethod.GET)
NewsEntry entry(#PathVariable Long id) {
return this.newsEntryRepository.findOne(id);
}
#RequestMapping(value = "/news/{id}", method = RequestMethod.POST)
NewsEntry update(#PathVariable Long id, #RequestBody NewsEntry news) {
NewsEntry old = this.newsEntryRepository.findOne(id);
old = news;
return this.newsEntryRepository.save(old);
}
#RequestMapping(value = "/news", method = RequestMethod.POST)
NewsEntry add(#RequestBody NewsEntry news) {
this.newsEntryRepository.save(new NewsEntry(news.getContent()));
return news;
}
}
OK Solution inspired from here https://github.com/mstahv/bootiful-neo4j-with-vaadin/blob/master/src/main/java/org/vaadin/neo4j/AppService.java. He is implementing a #Service annotated with #Transactional before using the repository in the controller.
You shouldn't have to override:
#Bean
public Neo4jTemplate neo4jTemplate() {
return new Neo4jTemplate(graphDatabaseService());
}
And can you try to add the annotation:
#EnableTransactionManagement
to your config?
Something is telling me that the solution is hiding somewhere here. I will give it a go and let you know.
OK This works only if you change the version of Spring-data-neo4j to 2.3.3.RELEASE. If you use the latest version you get the same problem as above. I think I should open an issue.
But that's not the solution as I would like to use Neo4J Server Community 2.0.3 to open the graph for visualization afterwards. Also I do not understand this solution beanfactories, injects instead of autowired???. However I will make another branch for this solution in my github repo.
Here is my ConfigUpdater class
private final class ConfigUpdater implements ManagedService {
#SuppressWarnings("rawtypes")
#Override
public void updated(Dictionary config) throws ConfigurationException {
if (config == null) {
return;
}
String title = ((String)config.get("title"));
}
}
My question is how can I access String title in any other class? Or how can I get config dictionary in any other class... Method updated will only be called when a config file is changed... once it is changed how can access its data in other class?
In general you would create a service that exposes these properties to other components.
For example, you could give your ConfigUpdater a second interface. Another component can than lookup/inject this interface from the service registry and use it's methods to access the properties.
I created an example project on GitHub: https://github.com/paulbakker/configuration-example
The most important part is the service that implements both ManagedService and a custom interface:
#Component(properties=#Property(name=Constants.SERVICE_PID, value="example.configurationservice"))
public class ConfigurationUpdater implements ManagedService, MyConfiguration{
private volatile String message;
#Override
public void updated(#SuppressWarnings("rawtypes") Dictionary properties) throws ConfigurationException {
message = (String)properties.get("message");
}
#Override
public String getMessage() {
return message;
}
}
The configuration can then be used like this:
#Component(provides=ExampleConsumer.class,
properties= {
#Property(name = CommandProcessor.COMMAND_SCOPE, value = "example"),
#Property(name = CommandProcessor.COMMAND_FUNCTION, values = {"showMessage"}) })
public class ExampleConsumer {
#ServiceDependency
private volatile MyConfiguration config;
public void showMessage() {
String message = config.getMessage();
System.out.println(message);
}
}