git svn mergeinfo tests: refactor "test -z" to use test_must_be_empty

Refactor some old-style test code to use test_must_be_empty instead of
"test -z". This makes a follow-up commit easier to read.

Signed-off-by: Ævar Arnfjörð Bjarmason <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: avar

t/t9151-svn-mergeinfo.sh

@@ -17,41 +17,42 @@ test_expect_success 'load svn dump' "
 "
 
 test_expect_success 'all svn merges became git merge commits' '
-	unmarked=$(git rev-list --parents --all --grep=Merge |
-		grep -v " .* " | cut -f1 -d" ") &&
-	[ -z "$unmarked" ]
+	git rev-list --parents --all --grep=Merge |
+		grep -v " .* " | cut -f1 -d" " >unmarked &&
+	test_must_be_empty unmarked
 '
 
+
 test_expect_success 'cherry picks did not become git merge commits' '
-	bad_cherries=$(git rev-list --parents --all --grep=Cherry |
-		grep " .* " | cut -f1 -d" ") &&
-	[ -z "$bad_cherries" ]
+	git rev-list --parents --all --grep=Cherry |
+		grep " .* " | cut -f1 -d" " >bad-cherries &&
+	test_must_be_empty bad-cherries
 '
 
 test_expect_success 'svn non-merge merge commits did not become git merge commits' '
-	bad_non_merges=$(git rev-list --parents --all --grep=non-merge |
-		grep " .* " | cut -f1 -d" ") &&
-	[ -z "$bad_non_merges" ]
+	git rev-list --parents --all --grep=non-merge |
+		grep " .* " | cut -f1 -d" " >bad-non-merges &&
+	test_must_be_empty bad-non-merges
 '
 
 test_expect_success 'commit made to merged branch is reachable from the merge' '
 	before_commit=$(git rev-list --all --grep="trunk commit before merging trunk to b2") &&
 	merge_commit=$(git rev-list --all --grep="Merge trunk to b2") &&
-	not_reachable=$(git rev-list -1 $before_commit --not $merge_commit) &&
-	[ -z "$not_reachable" ]
+	git rev-list -1 $before_commit --not $merge_commit >not-reachable &&
+	test_must_be_empty not-reachable
 '
 
 test_expect_success 'merging two branches in one commit is detected correctly' '
 	f1_commit=$(git rev-list --all --grep="make f1 branch from trunk") &&
 	f2_commit=$(git rev-list --all --grep="make f2 branch from trunk") &&
 	merge_commit=$(git rev-list --all --grep="Merge f1 and f2 to trunk") &&
-	not_reachable=$(git rev-list -1 $f1_commit $f2_commit --not $merge_commit) &&
-	[ -z "$not_reachable" ]
+	git rev-list -1 $f1_commit $f2_commit --not $merge_commit >not-reachable &&
+	test_must_be_empty not-reachable
 '
 
 test_expect_failure 'everything got merged in the end' '
-	unmerged=$(git rev-list --all --not master) &&
-	[ -z "$unmerged" ]
+	git rev-list --all --not master >unmerged &&
+	test_must_be_empty unmerged
 '
 
 test_done