Verify in Mockito simply means that you want to check if a certain method of a mock object has been called by specific number of times. Also you won't be able to verify those method as well. This occurs before each test method, so. This post Is just little miscellaneous where I will show you how to mock and verify a void method call. The mock not only mimics the function call interface of the system code outside the code under test it also provides the means to capture the parameters of function calls made upon it, record the order of calls made, and provide any function return value a programmer requires for testing scenarios. Mockito & JUnit tests. 3) Mockito thenAnswer use-case #1: accept any, return dynamically. First of all we need an interface. I have to admit that I looked for the first time into Mockito but it will stay on my list of everyday tools. After a little bit of research, I've found out there's a nice mockito feature that accomplishes what I want: doAnswer. This is due to the way mocking is implemented in Mockito, where a subclass of the class to be mocked is created; only instances of this “mock” subclass can have mocked behavior, so you need to have the tested code use them instead of any other instance. The @Mock annotation is used to create and inject mocked instances. To understand this, you need to know when a real method invocation happens. New here? Start with our free trials. Mockito provides (assuming that the List passed as a parameter is long Mockito cannot mock/spy because. July 8, 2014 - Last update: May 8, 2018 - Programming,. You can use the verify() method on the mock object to verify that the specified conditions are met. , Other testing tutorials: How to mock static, private methods (Powermock tutorial) Unit testing void methods using verify and ArgumentCaptor Mockito Deep Stubs Example Selenium based automated test using…. I solved it with the answer in mockito. Technically speaking both "mocks" and "spies" are a special kind of "test doubles". 1 overview of mockito Mockito is a mocking framework that tastes really good. When Mockito see this @InjectMocks, it doesn’t mock it, it just creates a normal instance, so the when() will be failed. 验证mock 具体例子可以参考Javadoc中的Mockito类. If you use the Form page to configure parameters (available in SoapUI Pro), you can set the value easily by selecting it from the drop-down list: If the Options list is empty, the parameter can store any value that matches its data type. By now you should know how to mock complex objects and their behaviour in unit tests but it would be good to know how to capture and check the parameters passed to a mock. I'd like to validate the parameters passed to DriverManager. Note that leaving off the second parameter to the verify method defaults to "exactly once" or times(1). But it's good to know that you can use Mockito in the JMock's way, by telling Mockito to verify all the invocations. Mockito Spy Three ways to mock an object using Mockito Using Mockito @InjectMocks with Constructor and Field Injections Void methods and Mockito in Java Find out if an object is a mock or spy in Mockito Execute Tests in Order in JUnit 4 Mock methods that return void JUnit 4 – Run Test Method More than Once Group JUnit Test Cases using @Suite. List interface and call its method. I'm fascinated by how easy it is to use, compared to other things out there both in the Java and. This lesson will help you get started with Mockito API. The answer is simple. pdf - Free download as PDF File (. More Mocking with Mockito. Mockito is a great mocking framework which we'll be using to provide data for our JUnit tests. As we have said, Mockito 2 is able to mock it all, so we're going to update the dependency. There are many flavours of stubbing adequate in certain situations. サンプルでみる Java の Mock ライブラリ Mockito の使い方 - 論よりコードということでサンプルをつらつらと。 package study. Allthough the behavior is mentioned in the documentation, it can not be bad to point it out here. It lets you write beautiful tests with a clean & simple API. The method looks like this: public & Error, T extends ServiceResponse> T validate( Object target, Validator. What will happen is the real method will be called *on mock* but *not on the real instance* you passed to the spy() method. Three ways to mock an object using Mockito Mockito Spy Void methods and Mockito in Java Capture Argument Passed to a mock’s method in Mockito Find out if an object is a mock or spy in Mockito Mock methods that return void Using Mockito @InjectMocks with Constructor and Field Injections. doSomething(mockedOrderDAO); //verify getOrders() on the DAO is invoked once by aRealObject. What is important to our example is that we call a userservice instance, while pondering the validity of a given email. thenReturn() covers 80% of all case in a code I suppose. After a little bit of research, I’ve found out there’s a nice mockito feature that accomplishes what I want: doAnswer. Even though we sometimes hate to write time and think they are just time consuming, they can make our app must more stable and bulletproof. When the MockitoJUnitRunner executes the test, Mockito creates mocks and spies instances for all fields that are annotated with the @Mock or the @Spy annotations. With parameters, you rely on the name (String-based) and the type declared. Mockito is an open sourced testing framework for Java that allows to create mock objects in Automated unit Tests. This overloaded method is use to provide a non-standard mock. The code which invokes the mock method is so isolated because mock method calls have no effects. txtCopyright (c) 2000-2005 INRIA, France Telecom All rights reserved. The Mockito API method reset() allows the mock object to be reset. In this report, we use whole-exome. Mockito is considered a mocking framework, but according to the Mockito FAQ, it is more accurately a Test Spy framework that allows you to verify behavior and stub methods. Verification By default Mockito doesn't expect any method to be called. change state or call another method. So, the main topic for Part 2 is Mockito's @Mock Annotation. mock before specifying a return value. Thus, Mockito can be statically imported into a class in this way: import static org. Although I often use Mockito for hand-written mock objects because the default behavior is more permissive, I find that it has a tendency to make me lazy in the sense that I can get a test running and not actually verify a lot of behavior. Mockito offers two equivalent ways of mocking: Using static methods and; Using @Mock annotations. problem want mock childdetails. if validate() void method, can use donothing() method spy. doSomething(mockedOrderDAO); //verify getOrders() on the DAO is invoked once by aRealObject. b(anyInt(), anyInt(), any(C[]. The answer is simple. Construction when(). In the unit testing when testing a method of one object which has the dependency on another object, this dependent object needs to be mocked. Let’s cover object methods first. Mockito is used to mock interfaces so that a dummy…. We’ll be using PersonService and PersonRepository classes. You can also check if a method was called with certain parameters: Mockito. mock is your mocked object and mode is the VerificationMode that describes how the mock should be verified. spy (Object) to find out more about partial mocks. The most of the Mockito facilities are static methods of org. Mocking Iterable objects generically with Mockito. Mockito vs JMockit, battle of the mocking frameworks. Now, our entity is a mock we can stub method isNew(). The mock API invocation goes into when() which is a static Mockito API method and the value that we want the want the mock to return goes into the then() API. import org. Generally, you first need to create a mock object with Mockito. Imagine you are trying to create a stub for a method that has a ref parameter. Previous In this post, we will see about Mockito Mock static method. A spy helps to call all the normal methods of the object while still. The fieldname related to the annotated mock is referred to in any verification so it's easier to identify the mock. Now we can easily test the displayActionsPerformed method as we. Mockito is an open source mock unit testing framework for Java. Next, the field declaration that is annotated with the @InjectMocks annotation is instantiated and Mockito injects the mocks and spies into it. Single mock whose methods must be invoked in a particular order // A. InvocationOnMock. We pass it three parameters and test that its output is a list with three parameters as well. We will describe why mocking is necessary, go over some examples and at the end, we will list the limitations of Mockito. Tell me some Mocking static methods with Mockito ; Tell me some Mocking static methods with Mockito. Foo mockFoo = Mockito. Find answers to junit test for void methods using mockito from the expert not being passed as parameter that is why it gives zero times invoked. java - when - mockito mock method with parameters set mock return value for any integer input parameter (1) when ( candidateService. verify(someMock). Mock objects are nothing but proxy for actual implementations. The previous example mocked a class with hardcoded argument. Mockito Maven Mockito Maven. This is because the mock can't know the behavior of a List, we must teach it ("stub" it). Hmm, this is a little weird, but still we can test it. mapToDTO(fragment. When Mockito see this @InjectMocks, it doesn't mock it, it just creates a normal instance, so the when() will be failed. The answer is simple. So here you don’t need to mock anything just create blank object & pass it along till you are sure that this object will not be used along your test flow. The code shown in examples below is available in GitHub java-samples/junit repository. mock child property job. Testing Blog When/how to use Mockito Answer Monday, March 03, 2014 You can pass an Answer instance as second parameter to the mock method to define the default. This can be done using doAnswer as shown in the following example which is an excerpt from this JUnit test. How can i avoid mocking all parameters but still stub the method. txtCopyright (c) 2000-2005 INRIA, France Telecom All rights reserved. I suppose, the first case every developer learn in Mockito is mocking methods with a return value. Verify a method was called with certain argument using Mockito. Mockito keeps track of all the method calls and their parameters to the mock object. Hmm, this is a little weird, but still we can test it. Redistribution and use in source and binary forms. Mockito is used to mock interfaces so that a dummy…. / src / org / mockito / exceptions / Reporter. By default, Mockito makes an attempt to preserve all annotation meta data on the mocked type and its methods to mirror the mocked type as closely as possible. We'll talk more about Mockito mock objects below. The when then pattern. dyanmic-mocking, junit, mockito, spy, thenAnswer This post we will mock a method based on parameters passed to method at runtime with a realtime example. Posted on October 1 (List. The code shown in examples below is available in GitHub java-samples/junit repository. You just simply overwrite the matches() method of the BaseMatcher abstract class, and pass the newly created object to argThat() method as a parameter. Publicado en CodingMarkers el 9 de julio del 2017. This enables a component to be tested in isolation even if it has dependencies on other components. Mockito won't work with final classes/methods, but there are a few workarounds: Add the open keyword to classes and methods that you'll mock. This method can throw an exception. Previous In this post, we will see about Mockito Mock static method. Verify that the field values of the TodoDTO object are correct. Mockito - modifying parameters My previous post was about how to get Mockito to generate a new instance of a class each time it is called. Finally the unit tests. Also being a cross-platform most top companies prefer it rather than using Quick Test Professional (QTP) and CodedUI, which are both. Mockito provides various methods to create mock objects. Sometimes we want to assert stuff about the arguments passed to a mocked method call. class); service. To create a stub (or a mock), use mock (class). This is very unclear in the API. if validate() void method, can use donothing() method spy. 8; Mocking of static methods in final system classes now works. Sample Application Let’s first look at our sample application. When writing unit test cases for a JSF application there might be a need to mock some of the FacesContext static methods. I see unit tests as my writ of passage before I can checkin any code into a project new to me --not to say I should ever checkin code without tests, but I think you all know what I mean. getList() is called, Static method when is called, A new mock of SomeModel is created (inside getSomeList()), Mock method model. After promising that I would be writing and maintaining my blog, here I go again (3289423987 attempt). 3) Mockito thenAnswer use-case #1: accept any, return dynamically. We start by showing how to configure Mockito, to mock the responses returned from the service, and inject the mocks into the rest service controller. Mockito:Java界使用最广泛的一个mock框架,mock表示在测试环境中创建一个类的虚假对象方便用于验证。 Mockito不支持mock匿名类、final类、静态方法和private方法。. To capture and verify all the method arguments passed to a method when it is invoked multiple times, we shall follow below steps: Use Mockito. We’ll be using PersonService and PersonRepository classes. Since Mockito 2. android / platform / external / mockito / idea133 /. forClass(…) is replaced with @Captor annotation. With that powerful combination it is just great. Argument matching with Mockito I recently fielded a question at a client about how to state verify indirect inputs into a mocked dependency. In particular, this means the new keyword should be used only in those. thenReturn (value) to specify the stub value for a method. You need to tell Mockito, whether you want to mock the method call or you want to call the real method. Mockito is a fantastic mock library for Java. line 5: we ask Mockito to use real (=original) code when method is invoked; CASE 2: independent method with test impediment. List interface and call its method. First potential code smell is reset() in the middle of the test method. There are many ways of testing a method. set mock return value for any integer input parameter (1) when (candidateService. To use Mockito like this in a ScalaTest project, the first step is to include the Mockito JAR file in your project. spy (Object) to find out more about partial mocks. You can access the list of all parameters passed during the test through the arguments. List in argument) by Mockito Below you can see an example class of WorkWithArrayList. The following are top voted examples for showing how to use org. After a little bit of research, I've found out there's a nice mockito feature that accomplishes what I want: doAnswer. With that powerful combination it is just great. import org. Sometimes we want to assert stuff about the arguments passed to a mocked method call. } so i have total 5 ordinal in enum HttpMethod but mockito does not know it. Mockito doesn't mock final methods so the bottom line is: when you spy on real objects + you try to stub a final method = trouble. We also verify that the send method was called with the string "c". This can be done using doAnswer as shown in the following example which is an excerpt from this JUnit test. But the best kind of test doesn't use Spring at all, so let's first look at how to use Mockito in a plain unit test to mock away unwanted dependencies. 1 Mockito是什么? Mockito是mocking框架,它让你用简洁的API做测试。 method on mock” System 预设的调用返回默认期望值 List mock. Most programmers know about the concept of unit tests and have dabbled with the Junit framework while they learn the beauty of automatic tests. txt) or read online for free. It's really good for methods where passing parameters are not important, but. Let’s say you have a Person class that has external communication and return values accordingly. In above example, we tested the HashMap which work on key-value pairs, so we created two ArgumentCaptor instances – one for key and second for value. Although I often use Mockito for hand-written mock objects because the default behavior is more permissive, I find that it has a tendency to make me lazy in the sense that I can get a test running and not actually verify a lot of behavior. Mockito vs JMockit, battle of the mocking frameworks. x, you’ll get the following error: Mockito cannot mock/spy following: – final classes – anonymous classes – primitive types. Mock some methods on an object Just some methods of an object can be mocked using spy() of mockito. Notice that we also use Mockito. Mockito makes mocking very easy. So I'm mocking method2, which accepts an object (sampleObj). , Other testing tutorials: How to mock static, private methods (Powermock tutorial) Unit testing void methods using verify and ArgumentCaptor Mockito Deep Stubs Example Selenium based automated test using…. To do this you need to prepare the class that invokes the method of the system class. CALLS_REAL_METHODS); Skip to content We can use matchers for mocked method parameters when == and equals cannot be. For example, stubSuggestionsFromApi method. Ex: //Method to stub public void myMethod(Bar bar, Foo foo, FooBar fooBar, BarFoo barFoo, endless list of parameters. iterator() method to return a mock iterator; Mock the iterator's hasNext() method to return true N times followed by false where N is the number of values that you want the iterator to return. To check if a method was called on a mocked object you can use the Mockito. List interface and call its method. By now you should know how to mock complex objects and their behaviour in unit tests but it would be good to know how to capture and check the parameters passed to a mock. Mockito doesn't mock final methods so the bottom line is: when you spy on real objects + you try to stub a final method = trouble. But with mockito we can't mock or replace static members of the class being tested. This enables a component to be tested in isolation even if it has dependencies on other components. class); B b = mock(B. The method looks like this: public & Error, T extends ServiceResponse> T validate( Object target, Validator. COM 学习 Mockito 赵彬 2011-2-15 目录 基础篇 使用 Mockito 的前期准备 ----- 3 从一个实例开始 ----- 4 Mock 对象的创建和 Stubbing ----- 5 Argument Matcher(参数匹配器)----- 7 Mock 对象的行为验证----- 8 对 Mock 对象方法的调用次数、顺序和超时进行验证----- 9 Mock 对象的重置----- 11 高级篇 Answer 接口(方法预期回调. Testing with mock objects. DZone > Java Zone > A Guide to Mocking With Mockito. Using these predefined methods makes testing very easy. Another possible approach is to use Mockito's Answer object that can be used with the when method. Mockito makes mocking very easy. doSomething(mockedOrderDAO); //verify getOrders() on the DAO is invoked once by aRealObject. import org. up vote 1 down vote favorite In below code, Mockito verify doesn't works as expected on scala methods with default parameter but works fine on methods with no default parameters. New here? Start with our free trials. mock(objectServiceImpl. S Tested in Spring Boot 2 environment. Mockito keeps track of all the method calls and their parameters to the mock object. So let’s get right into it. To understand this, you need to know when a real method invocation happens. Create as many ArgumentCaptor instances as the number of arguments in the method. Posted on October 1 (List. You have also learned how to build custom matchers to validate parameters using a more complex logic. In order to be able to match a certain type of object (Level, in our case), you have to define your own matcher. Use parameters to pass values to your template when creating or updating a stack so that you can customize each stack deployment. Rather, using fields for these mocks removes the duplication. Mockito provides following methods that can be used to mock void methods. Mockito doesn't mock final methods so the bottom line is: when you spy on real objects + you try to stub a final method = trouble. In some situations though, it is helpful to assert on certain arguments after the actual verification. The below example shows how to mock an autowired @Value field in Spring with Junit mockito framework. Each method parameter must use matcher, else, Mockito throws a InvalidUseOfMatchersException. I solved it with the answer in mockito. The fieldname related to the annotated mock is referred to in any verification so it's easier to identify the mock. MFLICENSENOTICEasm-license. invokeContinuationMethod. 1 First example. MemberModifier. Now you can inject a mock SomethingFactory in your test, and all the real SomethingFactory does is create your object with the appropriate arg and return it. But with mockito we can't mock or replace static members of the class being tested. Mockito is used to mock interfaces so that a dummy…. @Captor: It allows the creation of a field-level argument captor. In any other cases, if f is a function of 1 parameter, the array of the method parameters will be passed and if the function has 2 parameters, the second one will be the mock. You can use JUnit and Mockito. Like other annotations, @Captor annotation is also available in the org. You can use the verify()method on the mock object to verify that the specified conditions are met, i. Mock some methods on an object Just some methods of an object can be mocked using spy() of mockito. ts-mockito displays the method name and parameters as well as how many times a call was expected, but does not show the total calls that were recorded. Mockito offers two equivalent ways of mocking: Using static methods and; Using @Mock annotations. This tutorial tries to explain Mockito's verify and ArgumentCaptor features. Related Doc: In any other cases, if f is a function of 1 parameter, the array of the method parameters will be passed and if the function has 2 parameters, the second one will be the mock. Mocking a service is what Mockito excels at, so check out a sample test in emailuniquevisitortest. 1 11 Oct 2016. } so i have total 5 ordinal in enum HttpMethod but mockito does not know it. So, the main topic for Part 2 is Mockito's @Mock Annotation. While using Mockito in my unit tests, I have come across a problem regarding classes from third party libraries. Mockito's spy does not work along with AspectJ usi. The code shown in examples below is available in GitHub java-samples/junit repository. In Spock we can also get a hold on the arguments that are passed to a method call of a mock and we can write assertions to check the parameters for certain conditions. The abstract class MockUserService declares a matcher friendly varargs method doAddUsers(User) and delegates to it. Now, our entity is a mock we can stub method isNew(). So there shouldn't be need to mock static method. This can be done using doAnswer as shown in the following example which is an excerpt from this JUnit test. June 6, 2014, If we could mock the log4j logger, we could assert how many times the debug method was called and with what parameters. When the MockitoJUnitRunner executes the test, Mockito creates mocks and spies instances for all fields that are annotated with the @Mock or the @Spy annotations. We start by showing how to configure Mockito, to mock the responses returned from the service, and inject the mocks into the rest service controller. Mockito doesn't mock final methods so the bottom line is: when you spy on real objects + you try to stub a final method = trouble. @Captor: It allows the creation of a field-level argument captor. The fieldname related to the annotated mock is referred to in any verification so it's easier to identify the mock. The attributes might beRead More. In this tutorial, we are going to explain using Mockito with JUnit. First we tell our mammal what it should do when eatSomeFood is invoked with null as a parameter. Thus, Mockito can be statically imported into a class in this way: import static org. We will describe why mocking is necessary, go over some examples and at the end, we will list the limitations of Mockito. Mockito verifies argument values in natural java style: by using an equals() method. Mockito is a mocking framework, JAVA-based library that is used for effective unit testing of JAVA applications. Is there a clean method of mocking a class with generic parameters? Say I have to mock a class Foo which I need to pass into a method that expects a Foo. , that a method has been. change state or call another method. Junit Mockito Verify Example - Roy Tutorials. Changing default return values of unstubbed invocations (Since 1. In the end, we’ll be able to capture arguments and write assertions against them. It supports various programming languages such as Java, C#, PHP, JavaScript, and Ruby and supports various operating systems for execution like Windows, Linux, MacOS, etc. Definitely with the help of Mockito you can do everything you wish in the testing. Other testing tutorials: How to mock static, private methods (Powermock tutorial) Unit testing void methods using verify and ArgumentCaptor Mockito Deep Stubs Example Selenium based automated test using Java, JUNIT and Maven - Example When you need to unit test methods containing void methods which…. When using Mockito, you can match any kind of object through the method argThat(). Of course there are more possibilities and one rather important one is changing objects passed to mocked objects as parameters. It caught me off guard when the question was asked (the question came first thing in the morning on an iteration planning day), so I didn't just rattle off an answer. It is possible to use both generic methods and wildcards in tandem. How can I do this? All the examples I have found require a particular instance of an object before you can mock a method. Mockito reminded me a little bit of that show "Overhaulin" in regards to a very simple and clean interface for mocking objects and stubbing method calls. use below:. In the last video you saw some setup tasks for working with Mockito. problem want mock childdetails. We only assert the size of the output and not its content since: Previously we defined the response of convertBlockToDescriptor(). Note : Mockito almost all methods are static better use static import to make code clean. You can create mocks, stubs, make verifications and all this with the help of clear API. Parameters: mock - 要被. In any other cases, if f is a function of 1 parameter, the array of the method parameters will be passed and if the function has 2 parameters, the second one will be the mock. List interface and call its method. Mockachino instead hides its unsupported modes in the ordering API. set mock return value for any integer input parameter (1) when (candidateService. Let’s say you have a Person class that has external communication and return values accordingly. It opens the door to all the rest of its excellent features. Because the controller has two dependencies ( RequestService and CommentValidator) injected into it through Spring autowiring, we are going to create these two mocks and inject them into the controller by annotating them with Mockito's @Mock and @InjectMocks accordingly. 1 Mockito是什么? Mockito是mocking框架,它让你用简洁的API做测试。 method on mock” System 预设的调用返回默认期望值 List mock. Mock JUnit tests with Mockito example post introduces Mockito as Java mocking framework. Mockito keeps track of all the method calls and their parameters to the mock object. mock() creates mocks without bothering about the order of method calls that the mock is going to make in due course of its action. forClass(…) is replaced with @Captor annotation. To solve it, annotate @spy to mock it partially. Now that I was familiar with JUnit framework, I took a step forward to learn Mockito as it eases our unit testing and here is how I started. Hello Cris, The Article on Unit testing java servlets with Mockito and JUnit is very informative. Mock static method with Context as parameter using PowerMockito Mocking methods declared on non-public parent classes is not supported. Instead of reset() please consider writing simple, small and focused test methods over lengthy, over-specified tests. For example, Mockito, unlike PowerMock or JMockit, can not mock static methods. Sometimes we want to assert stuff about the arguments passed to a mocked method call. What are Matchers? Matchers are like regex or wildcards where instead of a specific input (and or output), you specify a range/type of input/output based on which stubs/spies can be rest and calls to stubs can be verified. Iterator; import java. Let's assume it's something like follows. InvocationOnMock. getList(), but now you're telling it you want to mock the model. powermock powermock-api powermock-api-easymock powermock-api-mockito powermock-api-mockito-common powermock-api-mockito2 powermock-api-support powermock-classloading powermock-classloading-module powermock-classloading-objenesis powermock-classloading-xstream powermock-core powermock-module-javaagent powermock-module-junit3 powermock-module. You can use the verify()method on the mock object to verify that the specified conditions are met, i. hidePlanArtifacts My guess is objectServiceImplMockObj is not being passed as parameter that is why it gives zero times invoked. OngoingStubbing. I think how mockito works in this case, is it checks was the method called with these parameters in this case Mockito. Above the method you can see that we exprect a RuntimeExcption so the test will only turn green if it throws one. 0, only allow non-null List. As we have said, Mockito 2 is able to mock it all, so we’re going to update the dependency. Maybe this article spares someones time debugging his code. Mockito also helps us to reduce the number of boilerplate code while using mockito annotations. On the downside, a local variable had to be moved to an attribute in order for Mockito to inject the mock. class); service. That is why I decided to create and share refactoring considerations alongside with examples and workarounds for unusual mocking. This prevents all of Human’s methods from doing anything, but more specifically prevents isSoHappy() from being called in Puppy. So I'm mocking method2, which accepts an object (sampleObj). As this is a nullable reference, the suggested API to match null wrapper would be isNull(). stub(MemberMatcher. Understand the basics of mocking with the most popular Java mocking framework with a simple mock example in 5 easy steps. After the test, you can query the mock to see what specific methods were called or check the side effects in the form of changed state. invocation on mock object that's going to be this name right here. initMocks method and pass the test class as its parameter. List in argument) by Mockito Below you can see an example class of WorkWithArrayList. Now we would expect that the list mock contains "one", but line 12 asserts that it doesn't, the list is empty. Verify can only work if the code flow goes to this real method and called the baz method. While using Mockito in my unit tests, I have come across a problem regarding classes from third party libraries. Mokito2へのマイグレーション. thenReturn() covers 80% of all case in a code I suppose. Search Search. Also, notice the how the behaviour of method isEmpty() is mocked below. Mockito comes with a concept of capturing the arguments passed to the mocked calls (in this case, call to RestTemplate would be mocked), using ArgumentCaptor, which captures argument values for further assertion. 0 - after so many years of hopeless waiting! There is a lot of cool updates in Mockito 2, including:.