reflog test: add more tests for 'reflog delete'

This adds more tests for 'reflog delete' and marks it as
broken, as currently a call to 'git reflog delete HEAD@{1}'
deletes entries in the currently checked out branch's log,
not the HEAD log.

Noticed by John Wiegley
Signed-off-by: NPieter de Bie <pdebie@ai.rug.nl>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

t/t1410-reflog.sh

@@ -175,7 +175,7 @@ test_expect_success 'recover and check' '
 
 '
 
-test_expect_success 'delete' '
+test_expect_failure 'delete' '
 	echo 1 > C &&
 	test_tick &&
 	git commit -m rat C &&
@@ -188,16 +188,30 @@ test_expect_success 'delete' '
 	test_tick &&
 	git commit -m tiger C &&
 
-	test 5 = $(git reflog | wc -l) &&
+	HEAD_entry_count=$(git reflog | wc -l)
+	master_entry_count=$(git reflog show master | wc -l)
+
+	test $HEAD_entry_count = 5 &&
+	test $master_entry_count = 5 &&
+
 
 	git reflog delete master@{1} &&
 	git reflog show master > output &&
-	test 4 = $(wc -l < output) &&
+	test $(($master_entry_count - 1)) = $(wc -l < output) &&
+	test $HEAD_entry_count = $(git reflog | wc -l) &&
 	! grep ox < output &&
 
+	master_entry_count=$(wc -l < output)
+
+	git reflog delete HEAD@{1} &&
+	test $(($HEAD_entry_count -1)) = $(git reflog | wc -l) &&
+	test $master_entry_count = $(git reflog show master | wc -l) &&
+
+	HEAD_entry_count=$(git reflog | wc -l)
+
 	git reflog delete master@{07.04.2005.15:15:00.-0700} &&
 	git reflog show master > output &&
-	test 3 = $(wc -l < output) &&
+	test $(($master_entry_count - 1)) = $(wc -l < output) &&
 	! grep dragon < output
 
 '