test-lint: detect 'export FOO=bar'

diff --git a/t/README b/t/README
index 9b41fe7a9f55b3803aa52cd26c9f0af4e34830ee..35b3c5c2faec0ed543dde460a30de63c48e5f1e7 100644 (file)
--- a/t/README
+++ b/t/README
@@ -86,7 +86,10 @@ appropriately before running "make".
 
 --immediate::
        This causes the test to immediately exit upon the first
-       failed test.
+       failed test. Cleanup commands requested with
+       test_when_finished are not executed if the test failed,
+       in order to keep the state for inspection by the tester
+       to diagnose the bug.
 
 --long-tests::
        This causes additional long-running tests to be run (where
@@ -321,6 +324,9 @@ Don't:
    use 'test_must_fail git cmd'.  This will signal a failure if git
    dies in an unexpected way (e.g. segfault).
 
+   On the other hand, don't use test_must_fail for running regular
+   platform commands; just use '! cmd'.
+
  - use perl without spelling it as "$PERL_PATH". This is to help our
    friends on Windows where the platform Perl often adds CR before
    the end of line, and they bundle Git with a version of Perl that
@@ -619,6 +625,11 @@ use these, and "test_set_prereq" for how to define your own.
    The process retains the same pid across exec(2). See fb9a2bea for
    details.
 
+ - PIPE
+
+   The filesystem we're on supports creation of FIFOs (named pipes)
+   via mkfifo(1).
+
  - SYMLINKS
 
    The filesystem we're on supports symbolic links. E.g. a FAT