A next issue is how to run a single test and get a newly added module function in the module properly loaded ...

With this dummy implementation:

➜  bigdecimal git:(gh-1186_BigMath_log_exp) ✗ pwd             
/Users/peter_v/data/projects/jruby/jruby/lib/ruby/2.1/bigdecimal

➜  bigdecimal git:(gh-1186_BigMath_log_exp) ✗ tail -5 math.rb 
  #
  def log(x, prec)
    10
  end
end

The test on rake test:mri behaves as expected (incorrect value 10 and should be 0), but limiting the test to only the affected test file does not seem to "load" my newly defined function ? (with undefined methodlog' for BigMath:Module`).

➜  jruby git:(gh-1186_BigMath_log_exp) ✗ bin/jruby -S rake test:mri                           
/Users/peter_v/Documents/data/projects/jruby/jruby/bin/jruby -I"lib" -X-C -J-ea -I test/mri -I test/mri/ruby -r ./test/mri_test_env.rb -r minitest/excludes -I"/Users/peter_v/Documents/data/projects/jruby/jruby/lib/ruby/shared" "/Users/peter_v/Documents/data/projects/jruby/jruby/lib/ruby/shared/rake/rake_test_loader.rb" "test/mri/ruby/test_alias.rb" "test/mri/ruby/test_array.rb" "test/mri/ruby/test_assignment.rb" "test/mri/ruby/test_autoload.rb" "test/mri/ruby/test_basicinstructions.rb" "test/mri/ruby/test_beginendblock.rb" "test/mri/ruby/test_bignum.rb" "test/mri/ruby/test_call.rb" "test/mri/ruby/test_case.rb" "test/mri/ruby/test_class.rb" "test/mri/ruby/test_clone.rb" "test/mri/ruby/test_comparable.rb" "test/mri/ruby/test_complex.rb" "test/mri/ruby/test_complex2.rb" "test/mri/ruby/test_complexrational.rb" "test/mri/ruby/test_condition.rb" "test/mri/ruby/test_const.rb" "test/mri/ruby/test_continuation.rb" "test/mri/ruby/test_defined.rb" "test/mri/ruby/test_dir.rb" "test/mri/ruby/test_dir_m17n.rb" "test/mri/ruby/test_econv.rb" "test/mri/ruby/test_encoding.rb" "test/mri/ruby/test_enum.rb" "test/mri/ruby/test_enumerator.rb" "test/mri/ruby/test_env.rb" "test/mri/ruby/test_eval.rb" "test/mri/ruby/test_exception.rb" "test/mri/ruby/test_file.rb" "test/mri/ruby/test_file_exhaustive.rb" "test/mri/ruby/test_fixnum.rb" "test/mri/ruby/test_flip.rb" "test/mri/ruby/test_float.rb" "test/mri/ruby/test_fnmatch.rb" "test/mri/ruby/test_gc.rb" "test/mri/ruby/test_hash.rb" "test/mri/ruby/test_ifunless.rb" "test/mri/ruby/test_integer.rb" "test/mri/ruby/test_integer_comb.rb" "test/mri/ruby/test_io.rb" "test/mri/ruby/test_io_m17n.rb" "test/mri/ruby/test_iterator.rb" "test/mri/ruby/test_lambda.rb" "test/mri/ruby/test_literal.rb" "test/mri/ruby/test_m17n.rb" "test/mri/ruby/test_m17n_comb.rb" "test/mri/ruby/test_marshal.rb" "test/mri/ruby/test_math.rb" "test/mri/ruby/test_metaclass.rb" "test/mri/ruby/test_method.rb" "test/mri/ruby/test_mixed_unicode_escapes.rb" "test/mri/ruby/test_module.rb" "test/mri/ruby/test_notimp.rb" "test/mri/ruby/test_numeric.rb" "test/mri/ruby/test_object.rb" "test/mri/ruby/test_objectspace.rb" "test/mri/ruby/test_optimization.rb" "test/mri/ruby/test_pack.rb" "test/mri/ruby/test_parse.rb" "test/mri/ruby/test_path.rb" "test/mri/ruby/test_pipe.rb" "test/mri/ruby/test_primitive.rb" "test/mri/ruby/test_proc.rb" "test/mri/ruby/test_rand.rb" "test/mri/ruby/test_range.rb" "test/mri/ruby/test_rational.rb" "test/mri/ruby/test_rational2.rb" "test/mri/ruby/test_readpartial.rb" "test/mri/ruby/test_regexp.rb" "test/mri/ruby/test_require.rb" "test/mri/ruby/test_rubyoptions.rb" "test/mri/ruby/test_settracefunc.rb" "test/mri/ruby/test_signal.rb" "test/mri/ruby/test_sleep.rb" "test/mri/ruby/test_sprintf.rb" "test/mri/ruby/test_sprintf_comb.rb" "test/mri/ruby/test_string.rb" "test/mri/ruby/test_stringchar.rb" "test/mri/ruby/test_struct.rb" "test/mri/ruby/test_super.rb" "test/mri/ruby/test_symbol.rb" "test/mri/ruby/test_syntax.rb" "test/mri/ruby/test_system.rb" "test/mri/ruby/test_thread.rb" "test/mri/ruby/test_time.rb" "test/mri/ruby/test_time_tz.rb" "test/mri/ruby/test_trace.rb" "test/mri/ruby/test_transcode.rb" "test/mri/ruby/test_undef.rb" "test/mri/ruby/test_unicode_escape.rb" "test/mri/ruby/test_variable.rb" "test/mri/ruby/test_whileuntil.rb" "test/mri/ruby/test_yield.rb" "test/mri/test_pp.rb" "test/mri/test_cmath.rb" "test/mri/test_delegate.rb" "test/mri/test_find.rb" "test/mri/test_ipaddr.rb" "test/mri/test_open3.rb" "test/mri/test_pp.rb" "test/mri/test_prettyprint.rb" "test/mri/test_prime.rb" "test/mri/test_pstore.rb" "test/mri/test_pty.rb" "test/mri/test_securerandom.rb" "test/mri/test_set.rb" "test/mri/test_shellwords.rb" "test/mri/test_singleton.rb" "test/mri/test_syslog.rb" "test/mri/test_tempfile.rb" "test/mri/test_time.rb" "test/mri/test_timeout.rb" "test/mri/test_tsort.rb" "test/mri/base64/test_base64.rb" "test/mri/benchmark/test_benchmark.rb" "test/mri/bigdecimal/test_bigdecimal.rb" "test/mri/bigdecimal/test_bigdecimal_util.rb" "test/mri/bigdecimal/test_bigmath.rb" "test/mri/cgi/test_cgi_cookie.rb" "test/mri/cgi/test_cgi_core.rb" "test/mri/cgi/test_cgi_header.rb" "test/mri/cgi/test_cgi_modruby.rb" "test/mri/cgi/test_cgi_multipart.rb" "test/mri/cgi/test_cgi_session.rb" "test/mri/cgi/test_cgi_tag_helper.rb" "test/mri/cgi/test_cgi_util.rb" "test/mri/coverage/test_coverage.rb" "test/mri/csv/test_csv_parsing.rb" "test/mri/csv/test_csv_writing.rb" "test/mri/csv/test_data_converters.rb" "test/mri/csv/test_encodings.rb" "test/mri/csv/test_features.rb" "test/mri/csv/test_headers.rb" "test/mri/csv/test_interface.rb" "test/mri/csv/test_row.rb" "test/mri/csv/test_table.rb" "test/mri/date/test_date.rb" "test/mri/date/test_date_arith.rb" "test/mri/date/test_date_attr.rb" "test/mri/date/test_date_base.rb" "test/mri/date/test_date_compat.rb" "test/mri/date/test_date_conv.rb" "test/mri/date/test_date_marshal.rb" "test/mri/date/test_date_new.rb" "test/mri/date/test_date_parse.rb" "test/mri/date/test_date_strftime.rb" "test/mri/date/test_date_strptime.rb" "test/mri/date/test_date_parse.rb" "test/mri/date/test_switch_hitter.rb" "test/mri/digest/test_digest.rb" "test/mri/digest/test_digest_extend.rb" "test/mri/digest/test_digest_hmac.rb" "test/mri/erb/test_erb.rb" "test/mri/erb/test_erb_m17n.rb" "test/mri/etc/test_etc.rb" "test/mri/fileutils/test_dryrun.rb" "test/mri/fileutils/test_fileutils.rb" "test/mri/fileutils/test_nowrite.rb" "test/mri/fileutils/test_verbose.rb" "test/mri/json/test_json.rb" "test/mri/json/test_json_addition.rb" "test/mri/json/test_json_encoding.rb" "test/mri/json/test_json_fixtures.rb" "test/mri/json/test_json_generate.rb" "test/mri/json/test_json_generic_object.rb" "test/mri/json/test_json_string_matching.rb" "test/mri/json/test_json_unicode.rb" "test/mri/logger/test_logger.rb" "test/mri/matrix/test_matrix.rb" "test/mri/matrix/test_vector.rb" "test/mri/monitor/test_monitor.rb" "test/mri/nkf/test_kconv.rb" "test/mri/nkf/test_nkf.rb" "test/mri/openssl/test_asn1.rb" "test/mri/openssl/test_bn.rb" "test/mri/openssl/test_buffering.rb" "test/mri/openssl/test_cipher.rb" "test/mri/openssl/test_config.rb" "test/mri/openssl/test_digest.rb" "test/mri/openssl/test_hmac.rb" "test/mri/openssl/test_ns_spki.rb" "test/mri/openssl/test_pair.rb" "test/mri/openssl/test_pkcs12.rb" "test/mri/openssl/test_pkcs7.rb" "test/mri/openssl/test_pkey_dh.rb" "test/mri/openssl/test_pkey_dsa.rb" "test/mri/openssl/test_pkey_rsa.rb" "test/mri/openssl/test_ssl.rb" "test/mri/openssl/test_x509cert.rb" "test/mri/openssl/test_x509crl.rb" "test/mri/openssl/test_x509ext.rb" "test/mri/openssl/test_x509name.rb" "test/mri/openssl/test_x509req.rb" "test/mri/openssl/test_x509store.rb" "test/mri/optparse/test_bash_completion.rb" "test/mri/optparse/test_getopts.rb" "test/mri/optparse/test_noarg.rb" "test/mri/optparse/test_optarg.rb" "test/mri/optparse/test_optparse.rb" "test/mri/optparse/test_placearg.rb" "test/mri/optparse/test_reqarg.rb" "test/mri/optparse/test_summary.rb" "test/mri/optparse/test_zsh_completion.rb" "test/mri/ostruct/test_ostruct.rb" "test/mri/pathname/test_pathname.rb" "test/mri/psych/test_alias_and_anchor.rb" "test/mri/psych/test_array.rb" "test/mri/psych/test_boolean.rb" "test/mri/psych/test_class.rb" "test/mri/psych/test_coder.rb" "test/mri/psych/test_date_time.rb" "test/mri/psych/test_deprecated.rb" "test/mri/psych/test_document.rb" "test/mri/psych/test_emitter.rb" "test/mri/psych/test_encoding.rb" "test/mri/psych/test_engine_manager.rb" "test/mri/psych/test_exception.rb" "test/mri/psych/test_hash.rb" "test/mri/psych/test_json_tree.rb" "test/mri/psych/test_merge_keys.rb" "test/mri/psych/test_nil.rb" "test/mri/psych/test_null.rb" "test/mri/psych/test_numeric.rb" "test/mri/psych/test_object.rb" "test/mri/psych/test_object_references.rb" "test/mri/psych/test_omap.rb" "test/mri/psych/test_parser.rb" "test/mri/psych/test_psych.rb" "test/mri/psych/test_scalar.rb" "test/mri/psych/test_scalar_scanner.rb" "test/mri/psych/test_serialize_subclasses.rb" "test/mri/psych/test_set.rb" "test/mri/psych/test_stream.rb" "test/mri/psych/test_string.rb" "test/mri/psych/test_struct.rb" "test/mri/psych/test_symbol.rb" "test/mri/psych/test_tainted.rb" "test/mri/psych/test_to_yaml_properties.rb" "test/mri/psych/test_tree_builder.rb" "test/mri/psych/test_yaml.rb" "test/mri/psych/test_yamlstore.rb" "test/mri/psych/json/test_stream.rb" "test/mri/psych/nodes/test_enumerable.rb" "test/mri/psych/visitors/test_depth_first.rb" "test/mri/psych/visitors/test_emitter.rb" "test/mri/psych/visitors/test_to_ruby.rb" "test/mri/psych/visitors/test_yaml_tree.rb" "test/mri/ripper/test_files.rb" "test/mri/ripper/test_filter.rb" "test/mri/ripper/test_parser_events.rb" "test/mri/ripper/test_ripper.rb" "test/mri/scanf/test_scanf.rb" "test/mri/scanf/test_scanfblocks.rb" "test/mri/socket/test_basicsocket.rb" "test/mri/socket/test_nonblock.rb" "test/mri/socket/test_socket.rb" "test/mri/stringio/test_stringio.rb" "test/mri/strscan/test_stringscanner.rb" "test/mri/thread/test_queue.rb" "test/mri/zlib/test_zlib.rb" "test/mri/ruby/enc/test_big5.rb" "test/mri/ruby/enc/test_cp949.rb" "test/mri/ruby/enc/test_emoji.rb" "test/mri/ruby/enc/test_euc_jp.rb" "test/mri/ruby/enc/test_euc_kr.rb" "test/mri/ruby/enc/test_euc_tw.rb" "test/mri/ruby/enc/test_gb18030.rb" "test/mri/ruby/enc/test_gbk.rb" "test/mri/ruby/enc/test_iso_8859.rb" "test/mri/ruby/enc/test_koi8.rb" "test/mri/ruby/enc/test_shift_jis.rb" "test/mri/ruby/enc/test_utf16.rb" "test/mri/ruby/enc/test_utf32.rb" "test/mri/ruby/enc/test_windows_1251.rb" 
/Users/peter_v/Documents/data/projects/jruby/jruby/test/mri/ruby/test_marshal.rb:281 warning: already initialized constant Résumé
Run options: 

# Running tests:

..................................../Users/peter_v/Documents/data/projects/jruby/jruby/test/mri/cgi/test_cgi_multipart.rb:122 warning: Tempfile#unlink or delete called on open file; ignoring
./Users/peter_v/Documents/data/projects/jruby/jruby/test/mri/cgi/test_cgi_multipart.rb:334 warning: Tempfile#unlink or delete called on open file; ignoring
./Users/peter_v/Documents/data/projects/jruby/jruby/lib/ruby/2.1/cgi/core.rb:582 warning: Tempfile#unlink or delete called on open file; ignoring
/Users/peter_v/Documents/data/projects/jruby/jruby/lib/ruby/2.1/cgi/core.rb:582 warning: Tempfile#unlink or delete called on open file; ignoring
... (repeated a few hundred times)
/Users/peter_v/Documents/data/projects/jruby/jruby/lib/ruby/2.1/cgi/core.rb:554 warning: Tempfile#unlink or delete called on open file; ignoring
/Users/peter_v/Documents/data/projects/jruby/jruby/lib/ruby/2.1/cgi/core.rb:554 warning: Tempfile#unlink or delete called on open file; ignoring
/Users/peter_v/Documents/data/projects/jruby/jruby/test/mri/cgi/test_cgi_multipart.rb:183 warning: Tempfile#unlink or delete called on open file; ignoring
/Users/peter_v/Documents/data/projects/jruby/jruby/test/mri/cgi/test_cgi_multipart.rb:183 warning: Tempfile#unlink or delete called on open file; ignoring
.........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................F............................/Users/peter_v/Documents/data/projects/jruby/jruby/test/mri/bigdecimal/test_bigdecimal.rb:106 warning: SAFE levels are not supported in JRuby
............................................................................................................................................................................................................................................................................................................................................................................................................................/Users/peter_v/Documents/data/projects/jruby/jruby/test/mri/coverage/test_coverage.rb:11 warning: tracing (e.g. set_trace_func) will not capture all events without --debug flag
......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................./Users/peter_v/Documents/data/projects/jruby/jruby/test/mri/ruby/test_gc.rb:40 warning: GC.enable does nothing on JRuby
/Users/peter_v/Documents/data/projects/jruby/jruby/test/mri/ruby/test_gc.rb:42 warning: GC.disable does nothing on JRuby
./Users/peter_v/Documents/data/projects/jruby/jruby/test/mri/ruby/test_gc.rb:15 warning: GC.stress= does nothing on JRuby
......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................../Users/peter_v/Documents/data/projects/jruby/jruby/test/mri/ruby/test_iterator.rb:451 warning: tracing (e.g. set_trace_func) will not capture all events without --debug flag
.................................................................................................................................................................................................../bin/sh: ldd: command not found
............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................F..........................................................................................................................................................

Finished tests in 147.497000s, 37.0313 tests/s, 5944.2972 assertions/s.

  1) Failure:
TestBigDecimal#test_BigMath_log_with_1 [/Users/peter_v/Documents/data/projects/jruby/jruby/test/mri/bigdecimal/test_bigdecimal.rb:1355]:
Expected |0.0 - 10| (10.0) to be <= 0.001.

  2) Failure:
TestTranscode#test_shift_jis [/Users/peter_v/Documents/data/projects/jruby/jruby/test/mri/ruby/test_transcode.rb:1243]:
[Encoding::UndefinedConversionError] exception expected, not
Class: <Encoding::InvalidByteSequenceError>
Message: <"\"\"\\xEF\"\" on Shift_JIS">
---Backtrace---
org/jruby/RubyString.java:6040:in `encode'
/Users/peter_v/Documents/data/projects/jruby/jruby/test/mri/ruby/test_transcode.rb:1243:in `test_shift_jis'
---------------

5462 tests, 876766 assertions, 2 failures, 0 errors, 9 skips

ruby -v: jruby 9000.dev (2.1.0.dev) 2013-10-29 b6a8fd0 on Java HotSpot(TM) 64-Bit Server VM 1.6.0_65-b14-462-11M4609 [darwin-x86_64]
rake aborted!
2

Tasks: TOP => test:mri => test:mri:int
(See full trace by running task with --trace)

# This (above) is the expected behavior.

➜  jruby git:(gh-1186_BigMath_log_exp) ✗ bin/jruby -S rake test:mri TEST=test/mri/bigdecimal/test_bigdecimal.rb
/Users/peter_v/Documents/data/projects/jruby/jruby/bin/jruby -I"lib" -X-C -J-ea -I test/mri -I test/mri/ruby -r ./test/mri_test_env.rb -r minitest/excludes -I"/Users/peter_v/Documents/data/projects/jruby/jruby/lib/ruby/shared" "/Users/peter_v/Documents/data/projects/jruby/jruby/lib/ruby/shared/rake/rake_test_loader.rb" "test/mri/bigdecimal/test_bigdecimal.rb" 
Run options: 

# Running tests:

E............................/Users/peter_v/Documents/data/projects/jruby/jruby/test/mri/bigdecimal/test_bigdecimal.rb:106 warning: SAFE levels are not supported in JRuby
.................................

Finished tests in 0.189000s, 328.0423 tests/s, 1137.5661 assertions/s.

  1) Error:
TestBigDecimal#test_BigMath_log_with_1:
NoMethodError: undefined method `log' for BigMath:Module
    /Users/peter_v/Documents/data/projects/jruby/jruby/test/mri/bigdecimal/test_bigdecimal.rb:1355:in `test_BigMath_log_with_1'

62 tests, 215 assertions, 0 failures, 1 errors, 0 skips

ruby -v: jruby 9000.dev (2.1.0.dev) 2013-10-29 b6a8fd0 on Java HotSpot(TM) 64-Bit Server VM 1.6.0_65-b14-462-11M4609 [darwin-x86_64]
rake aborted!
1

Tasks: TOP => test:mri => test:mri:int
(See full trace by running task with --trace)

Uh oh!

BigMath.exp and log missing #1186

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