[PATCH v2 0/8] Fix some bugs in abspath.c

Second version of patches, incorporating gratefully received advice from Hannes:

* Moved existing tests of real_path() from t0000 to t0060, and add new
  tests to t0060 instead of t0000.

* Adjusted the regexp used to construct a top-level directory that is
  needed for tests.

* Skip some tests when the POSIX prerequisite is not satisfied.

Michael Haggerty (8):
  t0060: move tests of real_path() from t0000 to here
  t0060: verify that absolute_path() fails if passed the empty string
  absolute_path(): reject the empty string
  t0060: verify that real_path() fails if passed the empty string
  real_path(): reject the empty string
  t0060: verify that real_path() works correctly with absolute paths
  real_path(): properly handle nonexistent top-level paths
  t0060: verify that real_path() removes extra slashes

 abspath.c             |  9 +++++++--
 t/t0000-basic.sh      | 18 -----------------
 t/t0060-path-utils.sh | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 62 insertions(+), 20 deletions(-)