introduce DualScenarioTest

[jangalinski]

see #388

Motivation: keep steps for given and when in same stage so you can easily build tests that build on each other like

given().doA();
when().doB();
then().assertState();

and

given().doA().and().doB();
when().doC();
then().assertState();

Naming things was the hard part, I came up with DualScenarioTest ... if you are generally fine with the idea, I will continue adding tests and docs.

[janschaefer]

Yeah, go ahead :-)

[jangalinski]

Do you have any hints for testing? I do not see any explicit tests for the SimpleScenarioTest(Base) ... but basically, I am doing the same with the DualScenarioTest(Base) ... is it ok to skip this?

[jangalinski]

I updated the adoc and mentioned DualScenarioTest where ever (2 locations) SimpleScenarioTest is mentioned already.

[jangalinski]

Could you check please if this is enough or give concrete tasks that should be done before this could get in a release?