new_contents: #
  # __COPYRIGHT__
  #
  # Permission is hereby granted, free of charge, to any person obtaining
  # a copy of this software and associated documentation files (the
  # "Software"), to deal in the Software without restriction, including
  # without limitation the rights to use, copy, modify, merge, publish,
  # distribute, sublicense, and/or sell copies of the Software, and to
  # permit persons to whom the Software is furnished to do so, subject to
  # the following conditions:
  #
  # The above copyright notice and this permission notice shall be included
  # in all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
  # KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
  # WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  #
  
  import os
  import unittest
  
  import SCons.Tool.javac
  
  class pathoptTestCase(unittest.TestCase):
      def assert_pathopt(self, expect, path):
          popt = SCons.Tool.javac.pathopt('-foopath', 'FOOPATH')
          env = {'FOOPATH': path}
          actual = popt(None, None, env, None)
          self.assertEquals(expect, actual)
  
      def test_unset(self):
          self.assert_pathopt([], None)
          self.assert_pathopt([], '')
  
      def test_str(self):
          self.assert_pathopt(['-foopath', '/foo/bar'],
                              '/foo/bar')
  
      def test_list_str(self):
          self.assert_pathopt(['-foopath', '/foo%s/bar' % os.pathsep],
                              ['/foo', '/bar'])
  
      def test_uses_pathsep(self):
          save = os.pathsep
          try:
              os.pathsep = '!'
              self.assert_pathopt(['-foopath', 'foo!bar'],
                                  ['foo', 'bar'])
          finally:
              os.pathsep = save
  
      def test_default(self):
          popt = SCons.Tool.javac.pathopt('-foopath', 'FOOPATH', default='DPATH')
          env = {'FOOPATH': ['/foo', '/bar'],
                 'DPATH': '/baz'}
  
          expect = ['-foopath', os.pathsep.join(['/foo', '/bar', '/baz'])]
          actual = popt(None, None, env, None)
          self.assertEquals(expect, actual)
  
  if __name__ == "__main__":
      unittest.main()
  
subject: Add unit tests for SCons.Tool.javac (pathopt class only). This carefully avoids known bugs in order to have passing tests.