[BEAM-8575] Test DoFn context params

[liumomo315]

Add two tests to test DoFn.ElementParam and DoFn.KeyParam.

Tag the other DoFn param tests as validates runner test to allow them to be picked up to run against Dataflow service.

---

Thank you for your contribution! Follow this checklist to help us incorporate your contribution quickly and easily:

• Choose reviewer(s) and mention them in a comment (R: @username).
• Format the pull request title like [BEAM-XXX] Fixes bug in ApproximateQuantiles, where you replace BEAM-XXX with the appropriate JIRA issue, if applicable. This will automatically link the pull request to the issue.
• If this contribution is large, please file an Apache Individual Contributor License Agreement.

See the Contributor Guide for more tips on how to make review process smoother.

Post-Commit Tests Status (on master branch)

Lang	SDK	Apex	Dataflow	Flink	Gearpump	Samza	Spark
Go		---	---		---	---
Java
Python		---			---	---
XLang	---	---	---		---	---	---

Pre-Commit Tests Status (on master branch)

---	Java	Python	Go	Website
Non-portable
Portable	---		---	---

See .test-infra/jenkins/README for trigger phrase, status and link of all Jenkins jobs.

[liumomo315]

R: @Chamikara

Hi Cham, this is one of the adding missing tests PRs. This PR has two simple tests for DnFn context params. PTAL:) Thanks!

[liumomo315]

Run Python Dataflow ValidatesRunner

[chamikaramj]

Retest this please

[chamikaramj]

Run Python Dataflow ValidatesRunner

[chamikaramj]

LGTM. Thanks.

Will merge after tests pass.

[liumomo315]

Thanks for the prompt review, Cham!

[liumomo315]

Run Python Dataflow ValidatesRunner

[liumomo315]

Hi Cham, I found the validates runner tests are failing due to that some tests should not be run as validates runner tests. They were tagged with validates runner in recent. I have a PR to revert those #10262. PTAL, Thanks! @chamikaramj

I will revert some tags in this PR too.

[chamikaramj]

Retest this please

[liumomo315]

Run Dataflow Python ValidatesRunner

[liumomo315]

Run Python Dataflow ValidatesRunner

[liumomo315]

Validates runner test failed due to test_flatten_no_pcollection. This test raises an exception in the test, and therefore should not be a validates runner test. #10286 to remove it from the validates runner tests.

[liumomo315]

Run Python Dataflow ValidatesRunner

[liumomo315]

Run Python Spark ValidatesRunner

[liumomo315]

Run Python 3.5 Flink ValidatesRunner

[liumomo315]

Hi @chamikaramj, I don't think the current failure has something to do with the new tests. Do we need to wait till they both pass?

[chamikaramj]

Yeah, seems to be unrelated. Merging.