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coverage: 41.558% (-51.9%) from 93.486%
72.1

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travis-ci

mbland 
test, kcov: Run coverage only by default on Travis

Now, instead of having Travis run the test, then run them again, and ignore the
return status of `kcov`, this change should allow Travis to just perform the
coverage run and rely on the `kcov` exit status.

As explained in the comment for the `test: run coverage by default on Travis
Linux` test case:

This test also makes sure the invocation doesn't cause a second recursive call
to `run_kcov` thanks to the `_COVERAGE_RUN` variable.  Previously, seemingly
successful coverage runs (added in commit
4440832c2) were causing Travis failures,
ameliorated in commit cc284d11e. These were
due to the `run_kcov` getting called recursively and failing because the first
call already created the `tests/coverage` directory.

Here was the chain of events:

- Travis calls `./go test`.
- Test suite runs and succeeds.
- `"$?" -eq '0' && "$TRAVIS_OS_NAME" == 'linux'` condition met.
- `_test_coverage` and `run_kcov` executed.
- `run_kcov` creates `tests/coverage` and executes `kcov ./go test`.
  - Test suite runs and succeeds.
  - `"$?" -eq '0' && "$TRAVIS_OS_NAME" == 'linux'` condition met.
  - `_test_coverage` and `run_kcov` executed.
  - `run_kcov` fails because `tests/coverage` already exists.
- `kcov` sends coverage info to Coveralls, but exits with an error.
- Travis build reports failure.

With the `_COVERAGE_RUN` variable, the recursive call is now
short-circuited.

96 of 231 relevant lines covered (41.56%)

132.04 hits per line

Source Files on job 72.1
Coverage ∆ File Lines Relevant Covered Missed Hits/Line