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Testing XText-based interpreter calling out to Henshin [message #1726593]

Mon, 14 March 2016 22:21

Steffen Zschaler

Messages: 266
Registered: July 2009

Senior Member

Hi,

I'm working on a small DSL written in XText. Its interpreter calls out to Henshin (for some graph transformations).

When setting up unit tests for this using the standard Xtext test set up, I noticed that the second interpreter test run in any test-suite run will fail (regardless of the order in which I run tests) because it cannot find the Henshin meta-model in the registry.

I have looked at https://www.eclipse.org/forums/index.php/t/823170/ , but that doesn't seem to apply here as Henshin isn't an XText language. I assume, though, that the test runner kicks Henshin out of the registry after the first test has run.

Where should I look to figure out how to fix this?

Many thanks,

Steffen

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Re: Testing XText-based interpreter calling out to Henshin [message #1726607 is a reply to message #1726593]

Tue, 15 March 2016 04:20

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

What do you do in your test. Is it a standalone or a ui test. Did you debug
what xtext runner and you henshin setup do with the end registry ....

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

[Updated on: Tue, 15 March 2016 04:28]

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Re: Testing XText-based interpreter calling out to Henshin [message #1726608 is a reply to message #1726607]

Tue, 15 March 2016 04:27

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

p.s:

having a special look at GlobalStateMemento and YourDslInjectorProvider might help as well

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Testing XText-based interpreter calling out to Henshin [message #1726619 is a reply to message #1726593]

Tue, 15 March 2016 07:38

Karsten Thoms

Messages: 762
Registered: July 2009
Location: Dortmund, Germany

Senior Member

Have a look at http://grepcode.com/file/repo1.maven.org/maven2/org.sculptorgenerator/sculptor-generator-library/3.0.0/org/eclipselabs/xtext/utils/unittesting/XtextRunner2.java
This runner was written since we had a similar problem in the past with Xtext languages.

Need professional support for Xtext, EMF, Eclipse IDE?
Go to: http://devhub.karakun.com
Twitter : @kthoms
Blog : www.karsten-thoms.de

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Re: Testing XText-based interpreter calling out to Henshin [message #1726621 is a reply to message #1726593]

Tue, 15 March 2016 07:50

Steffen Zschaler

Messages: 266
Registered: July 2009

Senior Member

Thanks, both, for these great tips. I will try these out and post back my findings. This may take me a little while, though, since something else has just come up that I need to tend to first.

Many thanks,

Steffen

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Re: Testing XText-based interpreter calling out to Henshin [message #1726739 is a reply to message #1726593]

Tue, 15 March 2016 22:39

Steffen Zschaler

Messages: 266
Registered: July 2009

Senior Member

Hi,

I managed to fix it. It turned out I didn't need the specialised text runner. Instead, all I had to do was to add the following line of code to setupRegistry in my test injector provider class:

EPackage.Registry.INSTANCE.put(HenshinPackage.eNS_URI, HenshinPackage.eINSTANCE);

I think, this is a bug in org.eclipse.xtext.junit4.GlobalRegistries: When storing the global state, it doesn't deal correctly with global package registries that are delegate registries: in this case, it only keeps track of what is in the main registry, but not of what is in the delegate registry. In my case, the Henshin meta-model was registered in the delegate registry only, so when restoreGlobalState was called, the registry entry was removed. Should I report this or is this considered a feature and I am just missing an important point?

Many thanks,

Steffen

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