Added configurable interaction matching.

[CamilYed]

Added 'last match algorithm' to determine the defined return value of a
method. This enables easy overriding of default return values. As
requested in issue #26, #251, #321 and #962.

[codecov]

Codecov Report

Merging #1308 (ff38f9b) into master (6b9d989) will increase coverage by 0.01%.
The diff coverage is 90.90%.

@@             Coverage Diff              @@
##             master    #1308      +/-   ##
============================================
+ Coverage     79.14%   79.16%   +0.01%     
- Complexity     3922     3927       +5     
============================================
  Files           409      409              
  Lines         12235    12253      +18     
  Branches       1610     1615       +5     
============================================
+ Hits           9684     9700      +16     
- Misses         1970     1971       +1     
- Partials        581      582       +1     

Impacted Files	Coverage Δ	Complexity Δ
...pock-core/src/main/java/spock/mock/MockingApi.java	2.88% <ø> (ø)	2.00 <0.00> (ø)
...ckframework/spring/mock/DelegatingInterceptor.java	53.84% <0.00%> (-1.42%)	6.00 <0.00> (ø)
.../spockframework/mock/runtime/InteractionScope.java	98.07% <90.00%> (-1.93%)	19.00 <5.00> (+5.00)	⬇️
...kframework/mock/runtime/GroovyMockInterceptor.java	76.47% <100.00%> (+0.71%)	7.00 <0.00> (ø)
...ockframework/mock/runtime/GroovyMockMetaClass.java	86.66% <100.00%> (+0.30%)	21.00 <0.00> (ø)
...ockframework/mock/runtime/JavaMockInterceptor.java	100.00% <100.00%> (ø)	15.00 <0.00> (ø)
...spockframework/mock/runtime/MockConfiguration.java	100.00% <100.00%> (ø)	20.00 <1.00> (+1.00)
...va/org/spockframework/mock/runtime/MockObject.java	83.78% <100.00%> (+0.92%)	23.00 <2.00> (+1.00)

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[CamilYed]

Could you review my changes: @szpak ?

[leonard84]

Spock 2.0 is in feature freeze at the moment

[CamilYed]

Not for 2.0 now

[leonard84]

@KamilJedrzejuk you didn't have to close this PR, the Spock 2.0 release is not far off, that's why we won't merge new features. We will review it afterwards.

[CamilYed]

Hi, what about this?