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1. JAVA REFLECTION GET RETURN FROM METHOD WITH ARGUMENT HOW TO
2. JAVA REFLECTION GET RETURN FROM METHOD WITH ARGUMENT CODE

Then we call the actual service method saveUser() of userService class. In this class we return mock object for any external service call or database operation. We need to initialize all mock objects, so we do it through init() method before running any test case. We are injecting all mock service or repository into the UserService class for which we are writing test case. Additionally, Groovy will automatically unbox to a primitive when calling a Java method that takes a primitive parameter and automatically box primitive method. We are running the class with MockitoJUnitRunner class. Here in the below Junit class we are mocking everything except the class for which we will create Junit test case.

JAVA REFLECTION GET RETURN FROM METHOD WITH ARGUMENT HOW TO

Now we would write a Junit class for the above service class and see how to use Junit Mockito Verify method. To do this, we specify the parameters option during compilation. Compiler Argument In order to be able to get access to method name information, we must opt-in explicitly. User user = convertToUserEntity(userDto) How to get parameter names with Java reflection To get the method i of a class C you call C.class.getMethods () i.toString (). In this quick tutorial, we'll take a look at how to access parameter names for constructors and methods at runtime using reflection. UserDto userDto = externalService.getUser(userId) class UserService UserRepository ExternalService externalService In the below class we have define a void method that should save the user data into underlying database. This is just for explanation purpose.Ĭonsider you have a Spring Data JPA repository called UserRepository that is used to perform basic CRUD operations on User data.Īssume User is an entity class and UserDto is DTO class and ExternalService is a service that fetches user data from external service.

JAVA REFLECTION GET RETURN FROM METHOD WITH ARGUMENT CODE

Please don’t try to run the below code you won’t be able to execute it. Suppose you have a Spring Service class as shown below and you want to write Junit test case for this class. Please read below in order to understand the concept: Junit and Mockito framework dependencies Problem Scenario

It is not necessary that you have to write test case for Spring Service class but you can write for any Java class. In this Junit Mockito Verify example I will show you how to apply Mockito’s verify() method while you are writing Junit test case on Spring Service class.

You may also like to read other Junit tutorials. You can also check the tutorial Junit test case on Java’s thread where I have used Junit’s verify() method to check whether the method executed at least once. The Junit Mockito Verify example will also shows how to resolve the issue – Argument passed to verify() is of type and is not a mock!, which occurs during the use of Mockito’s verify() method without spying the object. So Junit’s verify() method comes into rescue. Therefore you need some mechanism by which you ensure that your method has been executed at least once. When you write Junit test case for void method then you cannot return anything from your actual method test but at the same time you also don’t know whether your actual method has been executed or not. Testing.The tutorial Junit Mockito Verify method will show you how to verify a Java class method has been executed at least once or not.

Public static void main(String args) throws Exception ) We cast the returned value of the invocation to a String and we display the result to the console.įollowing this, we make a similar call to setString1() and another call to getString1(). For the first parameter of invoke() we pass in the Testing object on which we'd like to call the method, and the second parameter of invoke() is an array of Objects that represent the parameter values that we'd like to pass to the method when we invoke it. We invoke the getString1() method on our Testing object by calling invoke() on the Method object. Since getString1() has no parameters, this array is empty. The first parameter is the getMethod() call is the method name, and the second call is an array of Class objects representing the parameters of the getString1() method. Next, a Method object is obtained for the getString1() method of Testing by calling the getMethod() method of the Testing Class object that we have. A 'Testing' object is instantiated, and its class object is obtained via a call to getClass() on the object. This is demonstrated in the ClassMethodTest class below. In Java S W, it is possible to invoke a method on an object or class using the reflection API.