Run each test case at most once when using line filters

[brasmusson]

When the locations_filter was created to preserve the filter ordering from the command line when executing the test case (in Cucumber-Ruby-Core v1.1.0/Cucumber-Ruby v2.0.0.rc.4), so that cucumber path/a_feature.feature:10:5 would result in that the test case of line 10 is executed before the test case of line 5, it had the side effect of allowing each test case to executed more than once when using line filter.

Previously cucumber path/a_feature.feature:10:10:10 would result in that the test case of line 10 was executed once (as in Cucumber v1.3.x), now it results in the test case of line 10 is executed three times.

I think this is not what we want.

This PR contains a failing test for this problem, it is preferably fixed together with #96.

[mattwynne]

Can you see if this still fails when run on top of #99?

[brasmusson]

Yes, this still failed on top of #99. What is needed is the use of #uniq in LocationsFilter#sorted_test_cases (see 8681d0b). I did merge this onto #99 before applying 8681d0b, so merging #99 now will also merge and close this.

[lock]

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