[PATCH/RFC/GSoC 3/3] t0301: test credential-cache support of XDG_RUNTIME_DIR

[Hui Yiqun <huiyiqun@gmail.com>]

t0301 now tests git-credential-cache support for XDG user-specific
runtime file $XDG_RUNTIME_DIR/git/credential.sock. Specifically:

* if $XDG_RUNTIME_DIR exists, use socket at
  `$XDG_RUNTIME_DIR/git/credential-cache.sock`.

* otherwise, `/tmp/git-$uid/credential-cache.sock` is taken.

Signed-off-by: Hui Yiqun <huiyiqun@gmail.com>
---
 t/t0301-credential-cache.sh | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/t/t0301-credential-cache.sh b/t/t0301-credential-cache.sh
index 82c8411..0718bb0 100755
--- a/t/t0301-credential-cache.sh
+++ b/t/t0301-credential-cache.sh
@@ -12,7 +12,32 @@ test -z "$NO_UNIX_SOCKETS" || {
 # don't leave a stale daemon running
 trap 'code=$?; git credential-cache exit; (exit $code); die' EXIT
 
+test_expect_success 'set $XDG_RUNTIME_DIR' '
+	XDG_RUNTIME_DIR=$HOME/xdg_runtime/
+'
+
+helper_test cache
+
+test_expect_success 'when $XDG_RUNTIME_DIR is set, `$XDG_RUNTIME_DIR/git` are used' '
+	test_path_is_missing "/tmp/git-$(id -u)/git/credential-cache.sock" &&
+	test -S "$XDG_RUNTIME_DIR/git/credential-cache.sock"
+'
+
+test_expect_success 'force git-credential-cache to exit so that socket disappear' '
+	git credential-cache exit &&
+	test_path_is_missing "$XDG_RUNTIME_DIR/git/credential-cache.sock" &&
+	unset XDG_RUNTIME_DIR
+'
+
 helper_test cache
+
+test_expect_success 'when $XDG_RUNTIME_DIR is not set, `/tmp/git-$(id -u) is used' '
+	test -S "/tmp/git-$(id -u)/credential-cache.sock"
+'
+
+# TODO: if $XDG_RUNTIME_DIR/git/ exists, but has wrong permission and ownership,
+# `helper_test cache` must fail.
+
 helper_test_timeout cache --timeout=1
 
 # we can't rely on our "trap" above working after test_done,
-- 
2.7.2