JRuby exposes more parts of File as public instance methods than MRI does.

These two are made public in JRuby:

• ttymode
• ttymode_yield

Assumptions in FakeFS about that makes its asserts not pass. Update: FakeFS v0.10.0 changed it assumptions.

Environment

• jruby 9.1.6.0 (2.3.1) 2016-11-09 0150a76 Java HotSpot(TM) 64-Bit Server VM 24.76-b04 on 1.7.0_76-b13 +jit [linux-x86_64]
• Operating system: linux-x86_64 on Travis

Other relevant info you may wish to add:

• This is a test suite failure in the FakeFS gem
• IRC log where we investigated
• the code location in MRI where these are defined

Expected Behavior

File.instance_methods should exclude ttymode and ttymode_yield.

The test results in https://travis-ci.org/fakefs/fakefs/jobs/174750880 should not fail on ttymode_yield and ttymode

• MRI has the above methods marked private (I think)
• Here's a FakeFS test-case that checks File.instance_methods

Actual Behavior

• The current behavior exposes the two methods ttymode and ttymode_yield as public on File
• Here are the failing tests' output: https://travis-ci.org/fakefs/fakefs/jobs/174750880