test/language/java_spec: drop version to 1.6+

[miccal]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew tests with your changes locally?

---

On one of my Mac machines I use an app that (still!) works best with the legacy Java 6 provided by Apple.

This is the only version of Java I have on this machine:

|-> java -version
java version "1.6.0_65"
Java(TM) SE Runtime Environment (build 1.6.0_65-b14-468)
Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-468, mixed mode)

However, having this version causes brew tests to (correctly) fail:

|-> brew tests --only=language/java
Randomized with seed 41360
1 processes for 1 specs, ~ 1 specs per process
.....F

Failures:

  1) Language::Java::java_home returns valid JAVA_HOME if version is specified
     Failure/Error: expect(java_home/"bin/java").to be_an_executable
     
     NoMethodError:
       undefined method `/' for nil:NilClass
     # ./test/language/java_spec.rb:9:in `block (3 levels) in <top (required)>'
     # ./test/spec_helper.rb:194:in `block (3 levels) in <top (required)>'
     # ./test/spec_helper.rb:193:in `block (2 levels) in <top (required)>'
     # ./vendor/bundle/ruby/2.6.0/gems/rspec-retry-0.6.2/lib/rspec/retry.rb:124:in `block in run'
     # ./vendor/bundle/ruby/2.6.0/gems/rspec-retry-0.6.2/lib/rspec/retry.rb:110:in `loop'
     # ./vendor/bundle/ruby/2.6.0/gems/rspec-retry-0.6.2/lib/rspec/retry.rb:110:in `run'
     # ./vendor/bundle/ruby/2.6.0/gems/rspec-retry-0.6.2/lib/rspec_ext/rspec_ext.rb:12:in `run_with_retry'
     # ./vendor/bundle/ruby/2.6.0/gems/rspec-retry-0.6.2/lib/rspec/retry.rb:37:in `block (2 levels) in setup'
     # ./vendor/bundle/ruby/2.6.0/gems/rspec-wait-0.0.9/lib/rspec/wait.rb:46:in `block (2 levels) in <top (required)>'

Finished in 0.16638 seconds (files took 1.38 seconds to load)
6 examples, 1 failure

Failed examples:

rspec ./test/language/java_spec.rb:7 # Language::Java::java_home returns valid JAVA_HOME if version is specified


6 examples, 1 failure

Took 1 seconds

Changing the minimum version on java_spec.rb to 1.6+ fixes this error:

|-> brew tests --only=language/java
Randomized with seed 42928
1 processes for 1 specs, ~ 1 specs per process
......

Finished in 0.16627 seconds (files took 1.39 seconds to load)
6 examples, 0 failures


6 examples, 0 failures

Took 1 seconds

I know this is a very old version fo Java, but it is still provided by Apple, hence this PR.

Please feel free to reject this PR if this change would cause other issues that I may not be aware of.

Thank you.

[MikeMcQuaid]

Seems fair, thanks @miccal!