2.x: Parallelize unit test execution for speed!

[JakeWharton]

This gives me a 57% reduction in execution time.

[JakeWharton]

Looks like Travis can't handle it. I can disable it for CI builds where build speed isn't really important.

[codecov-io]

Current coverage is 69.93%

Merging #4113 into 2.x will decrease coverage by 0.02%

@@                2.x      #4113   diff @@
==========================================
  Files           380        380          
  Lines         27005      27005          
  Methods           0          0          
  Messages          0          0          
  Branches       4345       4345          
==========================================
- Hits          18894      18887     -7   
- Misses         6203       6206     +3   
- Partials       1908       1912     +4   

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[akarnokd]

This increases the likelihood of timeouts during heavy times. Maybe later.

[akarnokd]

In addition, some tests may conflict because they may change the global hooks. I'm guessing there isn't a JUnit annotation that allows some tests to run in parallel with others while forbidding for others?

[JakeWharton]

They run in forked JVMs so any static state won't clash.

On Sat, Jun 25, 2016, 6:23 AM David Karnok [email protected] wrote:

In addition, some tests may conflict because they may change the global
hooks. I'm guessing there isn't a JUnit annotation that allows some tests
to run in parallel with others while forbidding for others?

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[akarnokd]

Okay, let's try it.