t/README: A new section about test coverage

diff --git a/t/t0004-unwritable.sh b/t/t0004-unwritable.sh
index 63e1217e7162435c3da8ec7984b5f6a53b3a10e2..385b1265de53829053bae40f111a0bf30004b98b 100755 (executable)
--- a/t/t0004-unwritable.sh
+++ b/t/t0004-unwritable.sh
@@ -15,7 +15,7 @@ test_expect_success setup '
 
 '
 
-test_expect_success 'write-tree should notice unwritable repository' '
+test_expect_success POSIXPERM,SANITY 'write-tree should notice unwritable repository' '
 
        (
                chmod a-w .git/objects .git/objects/?? &&
@@ -27,7 +27,7 @@ test_expect_success 'write-tree should notice unwritable repository' '
 
 '
 
-test_expect_success 'commit should notice unwritable repository' '
+test_expect_success POSIXPERM,SANITY 'commit should notice unwritable repository' '
 
        (
                chmod a-w .git/objects .git/objects/?? &&
@@ -39,7 +39,7 @@ test_expect_success 'commit should notice unwritable repository' '
 
 '
 
-test_expect_success 'update-index should notice unwritable repository' '
+test_expect_success POSIXPERM,SANITY 'update-index should notice unwritable repository' '
 
        (
                echo 6O >file &&
@@ -52,7 +52,7 @@ test_expect_success 'update-index should notice unwritable repository' '
 
 '
 
-test_expect_success 'add should notice unwritable repository' '
+test_expect_success POSIXPERM,SANITY 'add should notice unwritable repository' '
 
        (
                echo b >file &&