t3510 (cherry-pick-sequencer): use exit status

All the tests asserting failure use 'test_must_fail', which simply
checks for a non-zero exit status, potentially hiding underlying bugs.
So, replace instances of 'test_must_fail' with 'test_expect_code' to
check the exit status explicitly, where appropriate.

Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t3510-cherry-pick-sequence.sh

@@ -46,7 +46,7 @@ test_expect_success setup '
 
 test_expect_success 'cherry-pick persists data on failure' '
 	pristine_detach initial &&
-	test_must_fail git cherry-pick -s base..anotherpick &&
+	test_expect_code 1 git cherry-pick -s base..anotherpick &&
 	test_path_is_dir .git/sequencer &&
 	test_path_is_file .git/sequencer/head &&
 	test_path_is_file .git/sequencer/todo &&
@@ -67,7 +67,7 @@ test_expect_success 'cherry-pick mid-cherry-pick-sequence' '
 
 test_expect_success 'cherry-pick persists opts correctly' '
 	pristine_detach initial &&
-	test_must_fail git cherry-pick -s -m 1 --strategy=recursive -X patience -X ours base..anotherpick &&
+	test_expect_code 128 git cherry-pick -s -m 1 --strategy=recursive -X patience -X ours base..anotherpick &&
 	test_path_is_dir .git/sequencer &&
 	test_path_is_file .git/sequencer/head &&
 	test_path_is_file .git/sequencer/todo &&
@@ -107,7 +107,7 @@ test_expect_success '--abort requires cherry-pick in progress' '
 
 test_expect_success '--quit cleans up sequencer state' '
 	pristine_detach initial &&
-	test_must_fail git cherry-pick base..picked &&
+	test_expect_code 1 git cherry-pick base..picked &&
 	git cherry-pick --quit &&
 	test_path_is_missing .git/sequencer
 '
@@ -121,7 +121,7 @@ test_expect_success '--quit keeps HEAD and conflicted index intact' '
 	:000000 100644 OBJID OBJID A	foo
 	:000000 100644 OBJID OBJID A	unrelated
 	EOF
-	test_must_fail git cherry-pick base..picked &&
+	test_expect_code 1 git cherry-pick base..picked &&
 	git cherry-pick --quit &&
 	test_path_is_missing .git/sequencer &&
 	test_must_fail git update-index --refresh &&
@@ -135,7 +135,7 @@ test_expect_success '--quit keeps HEAD and conflicted index intact' '
 
 test_expect_success '--abort to cancel multiple cherry-pick' '
 	pristine_detach initial &&
-	test_must_fail git cherry-pick base..anotherpick &&
+	test_expect_code 1 git cherry-pick base..anotherpick &&
 	git cherry-pick --abort &&
 	test_path_is_missing .git/sequencer &&
 	test_cmp_rev initial HEAD &&
@@ -145,7 +145,7 @@ test_expect_success '--abort to cancel multiple cherry-pick' '
 
 test_expect_success '--abort to cancel single cherry-pick' '
 	pristine_detach initial &&
-	test_must_fail git cherry-pick picked &&
+	test_expect_code 1 git cherry-pick picked &&
 	git cherry-pick --abort &&
 	test_path_is_missing .git/sequencer &&
 	test_cmp_rev initial HEAD &&
@@ -155,7 +155,7 @@ test_expect_success '--abort to cancel single cherry-pick' '
 
 test_expect_success 'cherry-pick --abort to cancel multiple revert' '
 	pristine_detach anotherpick &&
-	test_must_fail git revert base..picked &&
+	test_expect_code 1 git revert base..picked &&
 	git cherry-pick --abort &&
 	test_path_is_missing .git/sequencer &&
 	test_cmp_rev anotherpick HEAD &&
@@ -165,7 +165,7 @@ test_expect_success 'cherry-pick --abort to cancel multiple revert' '
 
 test_expect_success 'revert --abort works, too' '
 	pristine_detach anotherpick &&
-	test_must_fail git revert base..picked &&
+	test_expect_code 1 git revert base..picked &&
 	git revert --abort &&
 	test_path_is_missing .git/sequencer &&
 	test_cmp_rev anotherpick HEAD
@@ -173,7 +173,7 @@ test_expect_success 'revert --abort works, too' '
 
 test_expect_success '--abort to cancel single revert' '
 	pristine_detach anotherpick &&
-	test_must_fail git revert picked &&
+	test_expect_code 1 git revert picked &&
 	git revert --abort &&
 	test_path_is_missing .git/sequencer &&
 	test_cmp_rev anotherpick HEAD &&
@@ -184,7 +184,7 @@ test_expect_success '--abort to cancel single revert' '
 test_expect_success '--abort keeps unrelated change, easy case' '
 	pristine_detach unrelatedpick &&
 	echo changed >expect &&
-	test_must_fail git cherry-pick picked..yetanotherpick &&
+	test_expect_code 1 git cherry-pick picked..yetanotherpick &&
 	echo changed >unrelated &&
 	git cherry-pick --abort &&
 	test_cmp expect unrelated
@@ -193,7 +193,7 @@ test_expect_success '--abort keeps unrelated change, easy case' '
 test_expect_success '--abort refuses to clobber unrelated change, harder case' '
 	pristine_detach initial &&
 	echo changed >expect &&
-	test_must_fail git cherry-pick base..anotherpick &&
+	test_expect_code 1 git cherry-pick base..anotherpick &&
 	echo changed >unrelated &&
 	test_must_fail git cherry-pick --abort &&
 	test_cmp expect unrelated &&
@@ -208,7 +208,7 @@ test_expect_success '--abort refuses to clobber unrelated change, harder case' '
 
 test_expect_success 'cherry-pick still writes sequencer state when one commit is left' '
 	pristine_detach initial &&
-	test_must_fail git cherry-pick base..picked &&
+	test_expect_code 1 git cherry-pick base..picked &&
 	test_path_is_dir .git/sequencer &&
 	echo "resolved" >foo &&
 	git add foo &&
@@ -232,7 +232,7 @@ test_expect_success 'cherry-pick still writes sequencer state when one commit is
 
 test_expect_success '--abort after last commit in sequence' '
 	pristine_detach initial &&
-	test_must_fail git cherry-pick base..picked &&
+	test_expect_code 1 git cherry-pick base..picked &&
 	git cherry-pick --abort &&
 	test_path_is_missing .git/sequencer &&
 	test_cmp_rev initial HEAD &&
@@ -242,22 +242,22 @@ test_expect_success '--abort after last commit in sequence' '
 
 test_expect_success 'cherry-pick does not implicitly stomp an existing operation' '
 	pristine_detach initial &&
-	test_must_fail git cherry-pick base..anotherpick &&
+	test_expect_code 1 git cherry-pick base..anotherpick &&
 	test-chmtime -v +0 .git/sequencer >expect &&
-	test_must_fail git cherry-pick unrelatedpick &&
+	test_expect_code 128 git cherry-pick unrelatedpick &&
 	test-chmtime -v +0 .git/sequencer >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success '--continue complains when no cherry-pick is in progress' '
 	pristine_detach initial &&
-	test_must_fail git cherry-pick --continue
+	test_expect_code 128 git cherry-pick --continue
 '
 
 test_expect_success '--continue complains when there are unresolved conflicts' '
 	pristine_detach initial &&
-	test_must_fail git cherry-pick base..anotherpick &&
-	test_must_fail git cherry-pick --continue
+	test_expect_code 1 git cherry-pick base..anotherpick &&
+	test_expect_code 128 git cherry-pick --continue
 '
 
 test_expect_success '--continue of single cherry-pick' '
@@ -321,7 +321,7 @@ test_expect_success '--continue after resolving conflicts' '
 
 test_expect_success '--continue after resolving conflicts and committing' '
 	pristine_detach initial &&
-	test_must_fail git cherry-pick base..anotherpick &&
+	test_expect_code 1 git cherry-pick base..anotherpick &&
 	echo "c" >foo &&
 	git add foo &&
 	git commit &&
@@ -371,7 +371,7 @@ test_expect_success 'follow advice and skip nil patch' '
 
 test_expect_success '--continue respects opts' '
 	pristine_detach initial &&
-	test_must_fail git cherry-pick -x base..anotherpick &&
+	test_expect_code 1 git cherry-pick -x base..anotherpick &&
 	echo "c" >foo &&
 	git add foo &&
 	git commit &&
@@ -412,7 +412,7 @@ test_expect_success '--continue respects -x in first commit in multi-pick' '
 
 test_expect_success '--signoff is not automatically propagated to resolved conflict' '
 	pristine_detach initial &&
-	test_must_fail git cherry-pick --signoff base..anotherpick &&
+	test_expect_code 1 git cherry-pick --signoff base..anotherpick &&
 	echo "c" >foo &&
 	git add foo &&
 	git commit &&
@@ -456,24 +456,24 @@ test_expect_success 'sign-off needs to be reaffirmed after conflict resolution,
 
 test_expect_success 'malformed instruction sheet 1' '
 	pristine_detach initial &&
-	test_must_fail git cherry-pick base..anotherpick &&
+	test_expect_code 1 git cherry-pick base..anotherpick &&
 	echo "resolved" >foo &&
 	git add foo &&
 	git commit &&
 	sed "s/pick /pick/" .git/sequencer/todo >new_sheet &&
 	cp new_sheet .git/sequencer/todo &&
-	test_must_fail git cherry-pick --continue
+	test_expect_code 128 git cherry-pick --continue
 '
 
 test_expect_success 'malformed instruction sheet 2' '
 	pristine_detach initial &&
-	test_must_fail git cherry-pick base..anotherpick &&
+	test_expect_code 1 git cherry-pick base..anotherpick &&
 	echo "resolved" >foo &&
 	git add foo &&
 	git commit &&
 	sed "s/pick/revert/" .git/sequencer/todo >new_sheet &&
 	cp new_sheet .git/sequencer/todo &&
-	test_must_fail git cherry-pick --continue
+	test_expect_code 128 git cherry-pick --continue
 '
 
 test_expect_success 'empty commit set' '
@@ -483,18 +483,18 @@ test_expect_success 'empty commit set' '
 
 test_expect_success 'malformed instruction sheet 3' '
 	pristine_detach initial &&
-	test_must_fail git cherry-pick base..anotherpick &&
+	test_expect_code 1 git cherry-pick base..anotherpick &&
 	echo "resolved" >foo &&
 	git add foo &&
 	git commit &&
 	sed "s/pick \([0-9a-f]*\)/pick $_r10/" .git/sequencer/todo >new_sheet &&
 	cp new_sheet .git/sequencer/todo &&
-	test_must_fail git cherry-pick --continue
+	test_expect_code 128 git cherry-pick --continue
 '
 
 test_expect_success 'instruction sheet, fat-fingers version' '
 	pristine_detach initial &&
-	test_must_fail git cherry-pick base..anotherpick &&
+	test_expect_code 1 git cherry-pick base..anotherpick &&
 	echo "c" >foo &&
 	git add foo &&
 	git commit &&
@@ -505,7 +505,7 @@ test_expect_success 'instruction sheet, fat-fingers version' '
 
 test_expect_success 'commit descriptions in insn sheet are optional' '
 	pristine_detach initial &&
-	test_must_fail git cherry-pick base..anotherpick &&
+	test_expect_code 1 git cherry-pick base..anotherpick &&
 	echo "c" >foo &&
 	git add foo &&
 	git commit &&