Allow Dataproviders to return List<List<Object>>

[lbergelson]

Arrays can be inconvenient to work with. It would be nice if DataProviders could return a larger variety of types.

Particularly, I'd like to be able to use List<List<Object> as the return type, but something more general like Iterable<? extends Iterable<?>> might be better.

[sskorol]

@lbergelson you can try https://github.com/sskorol/test-data-supplier - DataProvider on steroids. It has Java 8, 10 and 11 support, and allows returning any type you want.

[lbergelson]

Oh, that looks very interesting. I will check it out.

[Skenvy]

I've found it's possible to knock out arbitrary Iterable<? extends Iterable<?>> by setting a configurable object's (of the test class) variable through @Factory wherein the object.variable is set to an instance of <? extends Iterable<?>>, and the object.variable gets passed to an @DataProvider which unwraps the iterator Iterable<?> onto the @DataProvider's array, a la [i][0] = <?>