Re: [PATCH 2/3] test-lib: allow setting the index format version

Allow adding a TEST_GIT_INDEX_VERSION variable to config.mak to set the
index version with which the test suite should be run.
...

diff --git a/Makefile b/Makefile
index 287e6f8..c98d28f 100644
--- a/Makefile
+++ b/Makefile

@@ -342,6 +342,10 @@ all::
 # Define DEFAULT_HELP_FORMAT to "man", "info" or "html"
 # (defaults to "man") if you want to have a different default when
 # "git help" is called without a parameter specifying the format.
+#
+# Define TEST_GIT_INDEX_FORMAT to 2, 3 or 4 to run the test suite