[WIP] [MPLUGINTESTING-93] - Prepare documentation / examples for JUnit 5 and Maven 3

[aamotharald]

starting some documentation activities now and performing testing of the JUnit5 maven-plugin testing capabilities with existing open source maven plugins.

@gnodet I have made a small change in the MojoExtension as I think it's valid to have no configuration for your maven plugin at all. I'll just take the commit away if my understanding here is wrong

[gnodet]

This is really interesting. I'd like to see some changes from https://github.com/apache/maven-plugin-testing/commit/c6ef221ab068ee487e1c535aa2b8925ecc4f0db6 back ported to make the annotations identical (the @Inherited and the changes in InjectMojo). Maybe also the new @Basedir annotation ?

[aamotharald]

Hi @gnodet , I have been able to to make the Annotations identical (added @Inherited and removed the boolean flag from InjectMojo). I was also able to backport the @Basedir Annotation and added a unit test for that behaviour.

So what's left open is the stubbing. I made a check and backporting all the stubs seems to be a bigger task. My current opinion is to NOT offer the stubs on maven 3 (which means maven-plugin-testing with stubs is only possible with old JUnit 4 style tests extending the AbstractMojoTestCase). What is your opinion there?

[jira-importer]

Resolve #192

[Bukama]

@aamotharald Same here :)

[slawekjaranowski]

@gnodet @slachiewicz @aamotharald I have rebased and fix build

I hope we can process it forward

[slawekjaranowski]

@gnodet @slachiewicz look ok for me .... I would like to process it

I will change PR title as we improve JUnit 5 implementation, documentation will be fixed in next PR

@aamotharald thanks for work