integration tests for showing new/upgradeable plugins

[ahmetb]

Tests when/how we show "New plugins available" and "Upgrades available for
installed plugins".

Adds ~3 seconds to integration tests.

[corneliusweig]

Nice work, just two questions.

Small footnote: You didn't write a test for when the installed plugin has no upgrade available, so it should not be listed in the output. This case is somewhat covered by unit tests, so we probably don't need it.

[ahmetb]

You didn't write a test for when the installed plugin has no upgrade available, so it should not be listed in the output. This case is somewhat covered by unit tests, so we probably don't need it.

actually that's valid, maybe I'll refactor the 2-plugin installing test to do that.

[codecov-io]

Codecov Report

Merging #479 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #479   +/-   ##
=======================================
  Coverage   56.47%   56.47%           
=======================================
  Files          19       19           
  Lines         926      926           
=======================================
  Hits          523      523           
  Misses        350      350           
  Partials       53       53

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[ahmetb]

done PTAL.

[corneliusweig]

/lgtm
/approve

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