[PATCH] t/README: Add 'Skipping Tests' section below 'Running Tests'

[Jakub Narebski <jnareb@gmail.com>]

Add description of GIT_SKIP_TESTS variable, taken almost verbatim
(adjusting for conventions in t/README) from the commit message in

   04ece59 (GIT_SKIP_TESTS: allow users to omit tests that are known to break)

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Jakub Narebski <jnareb@gmail.com>
---
So I don't have to look it up every time I want to use it...

 t/README |   28 ++++++++++++++++++++++++++++
 1 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/t/README b/t/README
index dc89263..8f12d48 100644
--- a/t/README
+++ b/t/README
@@ -59,6 +59,34 @@ Running Tests
 	available), for more exhaustive testing.
 
 
+Skipping Tests
+--------------
+
+In some environments, certain tests have no way of succeeding
+due to platform limitation, such as lack of 'unzip' program, or
+filesystem that do not allow arbitrary sequence of non-NUL bytes
+as pathnames.
+
+You should be able to say something like
+
+    $ GIT_SKIP_TESTS=t9200.8 sh ./t9200-git-cvsexport-commit.sh
+
+and even:
+
+    $ GIT_SKIP_TESTS='t[0-4]??? t91?? t9200.8' make
+
+to omit such tests.  The value of the environment variable is a
+SP separated list of patterns that tells which tests to skip,
+and either can match the "t[0-9]{4}" part to skip the whole
+test, or t[0-9]{4} followed by ".$number" to say which
+particular test to skip.
+
+Note that some tests in the existing test suite rely on previous
+test item, so you cannot arbitrarily disable one and expect the
+remainder of test to check what the test originally was intended
+to check.
+
+
 Naming Tests
 ------------
 
-- 
1.5.6