SPARK-4159 [BUILD] Addendum: improve running of single test after enabling Java tests

[srowen]

https://issues.apache.org/jira/browse/SPARK-4159 was resolved but as Sandy points out, the guidance in https://cwiki.apache.org/confluence/display/SPARK/Useful+Developer+Tools under "Running Individual Tests" no longer quite works, not optimally.

This minor change is not really the important change, which is an update to the wiki text. The correct way to run one Scala test suite in Maven is now:

mvn test -DwildcardSuites=org.apache.spark.io.CompressionCodecSuite -Dtests=none

The correct way to run one Java test is

mvn test -DwildcardSuites=none -Dtests=org.apache.spark.streaming.JavaAPISuite

Basically, you have to set two properties in order to suppress all of one type of test (with a non-existent test name like 'none') and all but one test of the other type.

The change in the PR just prevents Surefire from barfing when it finds no "none" test.
I'd make the wiki edit but I can't myself.

[SparkQA]

Test build #25380 has started for PR 3993 at commit 83106d7.

• This patch merges cleanly.

[SparkQA]

Test build #25380 has finished for PR 3993 at commit 83106d7.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[AmplabJenkins]

Test PASSed.
Refer to this link for build results (access rights to CI server needed):
https://amplab.cs.berkeley.edu/jenkins//job/SparkPullRequestBuilder/25380/
Test PASSed.

[JoshRosen]

@pwendell @mateiz Could one of you grant @srowen edit permissions on the Spark CWiki? I'd do it myself but I don't think I have admin privileges (could you grant them to me?).

[sryza]

@srowen do you know whether the sbt test instructions are still correct?

[sryza]

made the wiki edit for Maven

[mateiz]

Gave Sean edit permissions and made you admin. FYI the admin panel is really hard to find, it's under Browse -> Space Admin.

[srowen]

@sryza SBT won't run the Java tests, so that is unchanged. Wiki edit looks good to me. We do need this PR merged too or else excluding all Java tests will cause Surefire to barf.

[JoshRosen]

I think that SBT actually can run the Java tests, since I've successfully run only JavaAPISuite through SBT.

This looks good to me, so I'm going to merge this into master (1.3.0). Thanks!