read-cache.c: make $GIT_TEST_SPLIT_INDEX boolean

diff --git a/t/README b/t/README
index 24ddebfabf97be1251452fe5b6bba847597431fd..d5e0a3c786d6439550f21bf6c4ad0b387b15a2b4 100644 (file)
--- a/t/README
+++ b/t/README
@@ -293,6 +293,17 @@ and know what setup is needed for it.  Or when you want to run
 everything up to a certain test.
 
 
+Running tests with special setups
+---------------------------------
+
+The whole test suite could be run to test some special features
+that cannot be easily covered by a few specific test cases. These
+could be enabled by running the test suite with correct GIT_TEST_
+environment set.
+
+GIT_TEST_SPLIT_INDEX=<boolean> forces split-index mode on the whole
+test suite. Accept any boolean values that are accepted by git-config.
+
 Naming Tests
 ------------