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BigMath.log fails MRI 2.2 tests #2148

headius opened this Issue Nov 8, 2014 · 4 comments


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headius commented Nov 8, 2014

The most recent tests from MRI trunk (2.2) fail on JRuby's BigMath.log with the following error:

  1) Error:
Math::DomainError: Math::DomainError
    file:/Users/headius/projects/jruby/lib/jruby.jar!/jruby/bigdecimal.rb:24:in `log'
    /Users/headius/projects/jruby/test/mri/bigdecimal/test_bigmath.rb:72:in `(root)'
    /Users/headius/projects/jruby/test/mri/bigdecimal/test_bigmath.rb:70:in `test_log'

The test can be run like this to reproduce:

jruby test/mri/runner.rb bigdecimal/test_bigmath.rb -n test_log

I will exclude this failure and reference this bug. We do have many other failures currently excluded; at some point we should make an effort to fix these :-\

It's possible some pass and no longer need to be excluded. I have not audited them in a while.

@headius headius added this to the JRuby milestone Nov 8, 2014


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headius commented Nov 8, 2014

@petervandenabeele If you're still interested in helping, here's a nice opportunity :-)


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headius commented Nov 8, 2014

Failing test in question:

  def test_log
    assert_equal(0, BigMath.log(BigDecimal("1.0"), 10))
    assert_in_epsilon(Math.log(10)*1000, BigMath.log(BigDecimal("1e1000"), 10))
    assert_raise(Math::DomainError) {BigMath.log(BigDecimal("0"), 10)}
    assert_raise(Math::DomainError) {BigMath.log(BigDecimal("-1"), 10)}
    assert_separately(%w[-rbigdecimal], <<-SRC)
      x = BigMath.log(BigDecimal("1E19999999999999"), 10)
    rescue FloatDomainError
      unless x.infinite?
        assert_in_epsilon(Math.log(10)*19999999999999, x)

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tduehr commented Nov 14, 2014

This is a flaw in java.math.BigDecimal.

irb(main):025:0> "1E19999999999999", java.math.MathContext::UNLIMITED

@enebo enebo modified the milestone: JRuby Jul 14, 2015

@kares kares added the JRuby 9000 label Jul 23, 2015


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kares commented Aug 5, 2015

expected to be fixed at #3221

@kares kares closed this Aug 5, 2015

@kares kares added this to the JRuby milestone Aug 5, 2015

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