Strange bug with common.mk, File, Test::Unit

Hi all,

Ruby 1.8.6-p114
OS X, Solaris, Windows XP and Linux

I added a couple of test tasks in the common.mk file so that I could 
test specific subsets of test files. Below are just two that I added.

daniel-bergers-computer:~/src/ruby/ruby-1.8.6-p114 djberge$ diff -u 
common.orig common.mk
--- common.orig 2007-02-28 06:23:42.000000000 -0700
+++ common.mk   2008-05-14 22:09:14.000000000 -0600
@@ -66,6 +66,8 @@
                         $(LIBRUBY_EXTS) $(LIBRUBY_SO_UPDATE)

  TESTSDIR      = $(srcdir)/test
+TESTSDIR_ARRAY = $(srcdir)/test/core/Array
+TESTSDIR_FILE = $(srcdir)/test/core/File
  TESTWORKDIR   = testwork

  all: $(MKFILES) $(PREP) $(RBCONFIG) $(LIBRUBY)
@@ -286,6 +288,12 @@
  test-all:
         $(RUNRUBY) "$(srcdir)/test/runner.rb" --basedir="$(TESTSDIR)" 
--runner=$(TESTUI) $(TESTS)

+test-array:
+       $(RUNRUBY) "$(srcdir)/test/runner.rb" 
--basedir="$(TESTSDIR_ARRAY)" --runner=$(TESTUI) $(TESTS)
+
+test-file:
+       $(RUNRUBY) "$(srcdir)/test/runner.rb" 
--basedir="$(TESTSDIR_FILE)" --runner=$(TESTUI) $(TESTS)
+
  extconf:
         $(MINIRUBY) -I$(srcdir)/lib -run -e mkdir -- -p "$(EXTCONFDIR)"
         $(RUNRUBY) -C "$(EXTCONFDIR)" $(EXTCONF) $(EXTCONFARGS)

Nevermind that 'test/core/Array' doesn't exist. That's not the problem. 
After running configure & make, I get the following with 'make test-array':

daniel-bergers-computer:~/src/ruby/ruby-1.8.6-p114 djberge$ make test-array
./miniruby  ./runruby.rb --extout=.ext -- "./test/runner.rb" 
--basedir="./test/core/Array" --runner=console
Loaded suite .
Started

Finished in 0.000144 seconds.

0 tests, 0 assertions, 0 failures, 0 errors

Ok, no problem, the directory doesn't exist, so no tests run.

Now try make test-file:

daniel-bergers-computer:~/src/ruby/ruby-1.8.6-p114 djberge$ make test-file
./miniruby  ./runruby.rb --extout=.ext -- "./test/runner.rb" 
--basedir="./test/core/File" --runner=console
/Users/djberge/src/ruby/ruby-1.8.6-p114/lib/test/unit/collector/dir.rb:90:in 
`require': no such file to load -- . (LoadError)
         from 
/Users/djberge/src/ruby/ruby-1.8.6-p114/lib/test/unit/collector/dir.rb:90:in 
`collect_file'
         from 
/Users/djberge/src/ruby/ruby-1.8.6-p114/lib/test/unit/collector/dir.rb:77:in 
`recursive_collect'
         from 
/Users/djberge/src/ruby/ruby-1.8.6-p114/lib/test/unit/collector/dir.rb:29:in 
`collect'
         from 
/Users/djberge/src/ruby/ruby-1.8.6-p114/lib/test/unit/autorunner.rb:68
         from 
/Users/djberge/src/ruby/ruby-1.8.6-p114/lib/test/unit/autorunner.rb:213:in 
`[]'
         from 
/Users/djberge/src/ruby/ruby-1.8.6-p114/lib/test/unit/autorunner.rb:213:in 
`run'
         from 
/Users/djberge/src/ruby/ruby-1.8.6-p114/lib/test/unit/autorunner.rb:12:in 
`run'
         from ./test/runner.rb:7
make: *** [test-file] Error 1

What the heck is going on here? Some sort of strange scoping bug with 
regards to "File"? I can't narrow it down.

To make things even more confusing, this only happens on Linux and OS X, 
but not Windows or Solaris.

Any ideas?

Thanks,

Dan