all: run Docker dependent tests whenever possible

[shantuo]

Fixes #2005

All tests that require Docker container to run will run when either:

1. Not on Travis.
2. On Travis Linux environment, where Docker is available.

[codecov]

Codecov Report

Merging #2029 into master will increase coverage by 0.27%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2029      +/-   ##
==========================================
+ Coverage   77.56%   77.83%   +0.27%     
==========================================
  Files          82       82              
  Lines        9673     9675       +2     
==========================================
+ Hits         7503     7531      +28     
+ Misses       1628     1602      -26     
  Partials      542      542

Impacted Files	Coverage Δ
internal/docstore/dynamodocstore/dynamo.go	68.67% <0%> (+0.63%)	⬆️
internal/docstore/mongodocstore/mongo.go	71.24% <0%> (+0.85%)	⬆️
internal/docstore/docstore.go	84.41% <0%> (+1.94%)	⬆️
internal/docstore/firedocstore/fs.go	66.04% <0%> (+2.04%)	⬆️
internal/docstore/memdocstore/mem.go	76.62% <0%> (+3.24%)	⬆️
secrets/vault/vault.go	83.6% <0%> (+6.55%)	⬆️
internal/docstore/driver/driver.go	33.33% <0%> (+33.33%)	⬆️

---

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[eliben]

Thanks for doing this!

[eliben]

OOC, how do you verify these tests actually ran on Travis, rather than being skipped?

[shantuo]

I ran locally with the travis env, our Travis script doesn't have -v for go test so can't tell from there.

[vangent]

Some minor suggestions, otherwise LGTM.

[eliben]

I ran locally with the travis env, our Travis script doesn't have -v for go test so can't tell from there.

I think it's worthwhile to test this at least once (like add -v in your PR and remove it later)?

[shantuo]

Turning on -v to check the tests are running/skipping correctly and will turn if off later.