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diff --git a/t/README b/t/README
index dcd3ebb5f2..fecb76e599 100644
--- a/t/README
+++ b/t/README
@@ -84,6 +84,12 @@ appropriately before running "make".
implied by other options like --valgrind and
GIT_TEST_INSTALLED.
+--root=<directory>::
+ Create "trash" directories used to store all temporary data during
+ testing under <directory>, instead of the t/ directory.
+ Using this option with a RAM-based filesystem (such as tmpfs)
+ can massively speed up the test suite.
+
You can also set the GIT_TEST_INSTALLED environment variable to
the bindir of an existing git installation to test that installation.
You still need to have built this git sandbox, from which various
@@ -269,6 +275,14 @@ library for your script to use.
Merges the given rev using the given message. Like test_commit,
creates a tag and calls test_tick before committing.
+ - test_must_fail <git-command>
+
+ Run a git command and ensure it fails in a controlled way. Use
+ this instead of "! <git-command>". When git-command dies due to a
+ segfault, test_must_fail diagnoses it as an error; "! <git-command>"
+ treats it as just another expected failure, which would let such a
+ bug go unnoticed.
+
Tips for Writing Tests
----------------------