If you are familiar with hamcrest and JUnit the time will come when you have the need to create your own matchers. Creating your own matcher can be as simple as useful. One reason for creating your own matcher could be that your object is not a default object like a String or a Collection. And if you would like to get a more readable version of the assert for the next developer who has to read your test. Let’s make an example. If you have an object with two methods; “getName”...
Easier JUnit testing with hamcrest
Have you ever thought that JUnit assertions are not really readable and do not correspond to natural language? It is a mess that the expected value is the first argument on an assert? This would not be like the spoken language where you would say “assert that this value is equal to this expected one” ? Or have you had tests where the expected value and the value to test were inverted? In this case you have not found an old friend of JUnit called hamcrest.
No more development, TDD begins with MoreUnit
Do you program or do you already TDD? 🙂
If you prefer to do TDD you will love the eclipse plug-in called MoreUnit. It is as simple as powerful. All it does is executing tests from corresponding productive class and makes it very simple to change between them.
Just press Ctrl-J (like Jump) to jump from test to implementing class and the other way. Or press Ctrl-R (like Run) to run the test regardless if you are in the test or the implementation class.
Get bytes from ByteBuffer
Here I will show how to get bytes from a ByteBuffer. This isn’t as simple as it sounds.
Mockito – ArgumentMatcher vs ArgumentCaptor
Since a few weeks the new mockito release candidate is available. So I think it is the right time to place a new post. Here I will show the differences between ArgumentMatcher and ArgumentCaptor. Most developer will first see the ArgumentMatcher and use it. What can be done with ArgumentCaptor is often not seen. With the sample I will show that an ArgumentMatcher should not be used to fetch arguments. For this work there is the ArgumentCaptor. The Matcher should really be used to check if an...
BlueJ a simple Java IDE
Did you ever consider learning OOP (Object-oriented programming)? Or maybe you want just write a little code in Java? But you don’t want build an Enterprise level Project or study 1 Day, how to start with a “hello world” project? If you can answer one or more of these questions with yes, BlueJ might be the solution for you.
Why should we leave apache common collection? There are several reasons to change the collections framework. Since the apache collections should be backward compatible it would not be possible to change to a actual Java version. It would be necessary to change to another collection framework (or write all the stuff by yourself). There are several projects which created a collections framework by themselves or took the apache collection library and upgraded it with generics. Guava is a project...
VI like editing in eclipse
Since a few days I’m using a plugin in eclipse which allows vi like editing. It’s called vrapper and can be found under . It is a very good light weight alternative to commercial vi plugins. In my opinion there are not more disadvantages as in other vi plugins. Sometimes it has hangers, this means it does not fall back to the main state instead it hangs in any command mode. In this rare cases normally helps to restart the plugin with the icon in eclipse. The installation is very...
Mockito – Answer vs. Return
Did you had the problem your mock must act like a bean? And you could not create the object with the real implementation? And the interface was too large, so you would not create a innerclass for the test? I had this problem too. I solved it with the answer in mockito.
Create mocks with mockito
This is a small summarization what the differences are between the different variations creating mocks with mockito. Null values (default) Per default, after creating a mock, every method will return null. Just create your mock with: I think, this is very useful and straight forward. (And based by mockito developers idea, to create very fast a mock for testing). Sometimes it is very difficult to determine an error which was produced through such a null value. For this case it is very...