All the tests so far check that @{N} is the same as HEAD@{N} (for
positive N).  However, this is not always the case: write a couple of
tests for this.

Signed-off-by: Ramkumar Ramachandra <artag...@gmail.com>
---
 t/t1508-at-combinations.sh | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/t/t1508-at-combinations.sh b/t/t1508-at-combinations.sh
index eaa5337..29ffd73 100755
--- a/t/t1508-at-combinations.sh
+++ b/t/t1508-at-combinations.sh
@@ -59,4 +59,18 @@ nonsense "@{1}@{u}"
 nonsense "HEAD@{-1}"
 nonsense "@{-1}@{-1}"
 
+# Document differences between @{N} and HEAD@{N}.  The former resolves
+# HEAD to a branch and looks up the logs for that branch, while the
+# latter looks for the logs of HEAD.
+check "HEAD@{3}" commit old-two
+nonsense "@{3}"
+
+test_expect_success 'switch to old-branch' '
+       git checkout old-branch
+'
+
+check HEAD refs/heads/old-branch
+check "HEAD@{1}" commit new-two
+check "@{1}" commit old-one
+
 test_done
-- 
1.8.3.rc0.40.g09a0447

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