Add semantic tests for ExperimentalStateTracker

Now that the experimental UI has the first properties we want to keep
in the long run, add a test asserting the following semantic
properties.

- Whenever only one action is running, it is shown somehow in the
  progress bar.

- Completed actions should not be shown in the progress bar.

- The earliest-started still running action should be visible in
  the progress bar.

While there, also drop the assumption in the ExperimentalStateTracker
that the ExecutionProgressReceiverAvailableEvent has to come before
any actions that has not been finished yet.

--
Change-Id: Ica52eb12546703e4f8f9d9c64928208621d19ced
Reviewed-on: https://bazel-review.googlesource.com/#/c/3048
MOS_MIGRATED_REVID=117121300
3 files changed
tree: d7410ee53a7af26cfd104857b5521dc2e596aa7e
  1. examples/
  2. scripts/
  3. site/
  4. src/
  5. third_party/
  6. tools/
  7. .gitattributes
  8. .gitignore
  9. AUTHORS
  10. BUILD
  11. CHANGELOG.md
  12. compile.sh
  13. CONTRIBUTING.md
  14. CONTRIBUTORS
  15. LICENSE.txt
  16. README.md
  17. WORKSPACE
README.md

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