How to mock constructors in JMockit? I have spent hours trying to debug only to find out that I forgot. How to mock constructors with parameters or those that take arguments? In the following example the static initialization block calls a static method and sets the bankBalance to But in our test case we want to start off with Behaviour Based Testing or using the Expectations class.
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How to mock constructors in JMockit? I have spent hours trying to debug only to find out that I forgot. How to mock constructors with parameters or those that take arguments?
In the following example the static initialization block calls a static method and sets the bankBalance to But in our test case we want to start off with Behaviour Based Testing or using the Expectations class. State Based Testing using the MockUp apis.
First using the Expectations class 1. Lets continue with the Bank example. The code to achieve all this is given below Now quick trivia! Any Guesses? Try this yourself. But then, our test cases may not be so rigid. In that case use the NonStrictExpectations class.
It places no restrictions on the number of times the mocked method is called or if any other method of the same object is called. One last tip before we move onto the MockUp apis. In the previous section point number 2 states that the argument passed must be For this JMockit provides us with a field called anyInt. We will look into more of this in this section.
If you have already read "How to mock constructors in Jmockit? They are defined independently and work the same in any case. This is a great utility if only some methods of a class need to be redefined. To be able to modify private methods? The follwing two examples will give you how a private method is redefined first by using the Expectations api and then the MockUp api. First the Expectation API.
This class has static methods that can invoke private methods and access private fields. The Expectations Way The only thing to be done is to mark the field in the test class with Mocked or create a local variable in the anonymous Expectations class.
Lets go back to the Bank example. However when we write the test method we want the getConnectionString to return altogether a different String. If you have read the previous "How to"s, you already know the answer - its the Deencapsulation class. There may be a private method you want to test. I personally wont agree to this. If you are stuck with writing test methods for legacy code, you cant just refactor the code and check it in. The latter is a mammoth process in itself.
It becomes a bowl of hot vegetable noodles you wont be able to handle later on. Back to Deencapsulation class!
The most used methods are invoke , setField and the getField. How to throw Exceptions in an Expectations block? Till now we have been returning an object or some literal when we mock a method. What if we want to throw an Exception? The following example shows where we throw an exception in the Expectations block. In this I anticipated an Exception to be thrown and have stated that in the Test annotation.
Some more JMockit utilities before signing off. Know the rule? These are some of the Home work you need to do. Learn it. Use Cascading if there is a method chain to be tested. Learn how to use the any fields - anyInt, any, anyString, anyLong
The JMockit Testing Toolkit Tutorial
Running tests from Gradle The toolkit is provided as a set of artifacts deployed to the Maven Central repository. For instructions on how to add the library to a Java project, see Running tests with JMockit. In this tutorial we examine the APIs available in the library, with the help of example tests using Java 8. The central API - a single annotation - provides support for the automatic instantiation and initialization of the objects to be tested. Finally, there is a small faking API aka the "Mockups" API , which can be used for the creation and application of fake implementations that avoid the full cost of external components. Even though the tutorial is fairly complete, it does not attempt to cover the entire published APIs in detail. A complete and detailed specification for all annotations, classes, methods, etc.