1 URL: null

     2 spec: ftp://ftp.foo.com/dir1/entry.txt

     3 expected: ftp://ftp.foo.com/dir1/entry.txt

     4 

     5 URL: null

     6 spec: ftp://br:pwd@ftp.foo.com/dir1/jar.jar

     7 expected: ftp://br:pwd@ftp.foo.com/dir1/jar.jar

     8 

     9 URL: ftp://ftp.foo.com/dir1/foo.txt

    10 spec: bar.txt

    11 expected: ftp://ftp.foo.com/dir1/bar.txt

    12 

    13 URL: ftp://ftp.foo.com/dir1/jar.jar

    14 spec: /entry.txt

    15 expected: ftp://ftp.foo.com/entry.txt

    16 

    17 URL: ftp://ftp.foo.com/dir1/jar.jar

    18 spec: dir1/entry.txt

    19 expected: ftp://ftp.foo.com/dir1/dir1/entry.txt

    20 

    21 URL: ftp://ftp.foo.com/dir1/jar.jar

    22 spec: /dir1/entry.txt

    23 expected: ftp://ftp.foo.com/dir1/entry.txt

    24 

    25 URL: ftp://br:pwd@ftp.foo.com/dir1/jar.jar

    26 spec: /dir1/entry.txt

    27 expected: ftp://br:pwd@ftp.foo.com/dir1/entry.txt