MockFunction for more concise Function mocking. #25

[lemonboston]

Note: this is based on #24 currently (because of ValueObject usage).

[codecov-io]

Codecov Report

Merging #26 into master will decrease coverage by 0.41%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #26      +/-   ##
============================================
- Coverage     83.98%   83.57%   -0.42%     
- Complexity      310      316       +6     
============================================
  Files            70       73       +3     
  Lines           743      767      +24     
  Branches         64       64              
============================================
+ Hits            624      641      +17     
- Misses           96      103       +7     
  Partials         23       23

Impacted Files	Coverage Δ	Complexity Δ
...in/java/org/dmfs/testutils/mocks/MockFunction.java	100% <100%> (ø)	6 <6> (?)
.../src/main/java/org/dmfs/testutils/TestDoubles.java	0% <0%> (ø)	0% <0%> (?)
...s/src/main/java/org/dmfs/testutils/FailAnswer.java	0% <0%> (ø)	0% <0%> (?)

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[dmfs]

can this be rebased on master?

[lemonboston]

Commented here: #25 (comment)

[lemonboston]

Finished rewriting MockFunction and its test, squashed and rebased. Ready for review.