So with generating an enormous amount of test code, comes the usual task code & test maintenance and reuse.
One of the tools / libraries we have included is Hamcrest, which not only improves the readability of assertion failures, but allows you to create and extend custom matchers, which you can then reuse across multiple test scenarios.
I am not going to go into too much detail on Hamcrest here, where are a bunch of great resources / blogs / tutorials out there.. just a few:
While creating a custom type safe matcher for one of our domain objects, I realised that was insane.. really.. this.getA == that.getA... mmmm no.
So I went searching for something could help and and after a bit, I found: Shazamcrest (bonus points for the name)
What Shazamcrest does is:
Serialize the objects to compare.
Compares them and then on fail throws a ComparisonFailure, which the major IDE's allow you use their build in diff display.
Great... no manual bean compares.
So I add the maven dependency, try it out on our complex domain object....
StackOverflowError.... It was a known limitation at the time. The json provider Shazamcrest was using:
GSON does not cater for circular reference serialization.
As both Shazamcrest and GSON being opensource, I decided to have a look and see if I could contribute, anything is better that writing a manual bean matcher. After some investigation I found that the guys on the GSON project have created a fix GraphAdapterBuilder, it is just not distributed with the actual library.
So after fork on the Shazamcrest GitHub project, a little bit of code and submitting a pull request:
The guys on the Shazamcrest project very quickly merged my changes in and published a new version to the maven repo (Thanks for that).
So be sure to use the 0.8 version if you are struggling with circular references.
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