describe tests: fix nested "test_expect_success" call

Fix a nested invocation of "test_expect_success", the
"check_describe()" function is a wrapper for calling
test_expect_success, and therefore needs to be called outside the body
of another "test_expect_success".

The two tests added in 30b1c7a (describe: don't abort too early
when searching tags, 2020-02-26) were not testing for anything due to
this logic error. Without this fix reverting the C code changes in
that commit still has all tests passing, with this fix we're actually
testing the "describe" output. This is because "test_expect_success"
calls "test_finish_", whose last statement happens to be true.

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

Author: avar

t/t6120-describe.sh

@@ -469,7 +469,7 @@ test_expect_success 'name-rev covers all conditions while looking at parents' '
 #  o-----o---o----x
 #        A
 #
-test_expect_success 'describe commits with disjoint bases' '
+test_expect_success 'setup: describe commits with disjoint bases' '
 	git init disjoint1 &&
 	(
 		cd disjoint1 &&
@@ -482,19 +482,22 @@ test_expect_success 'describe commits with disjoint bases' '
 		git checkout --orphan branch && rm file &&
 		echo B > file2 && git add file2 && git commit -m B &&
 		git tag B -a -m B &&
-		git merge --no-ff --allow-unrelated-histories main -m x &&
-
-		check_describe "A-3-gHASH" HEAD
+		git merge --no-ff --allow-unrelated-histories main -m x
 	)
 '
 
+(
+	cd disjoint1 &&
+	check_describe "A-3-gHASH" HEAD
+)
+
 #           B
 #   o---o---o------------.
 #                         \
 #                  o---o---x
 #                  A
 #
-test_expect_success 'describe commits with disjoint bases 2' '
+test_expect_success 'setup: describe commits with disjoint bases 2' '
 	git init disjoint2 &&
 	(
 		cd disjoint2 &&
@@ -508,10 +511,13 @@ test_expect_success 'describe commits with disjoint bases 2' '
 		echo o >> file2 && git add file2 && GIT_COMMITTER_DATE="2020-01-01 15:01" git commit -m o &&
 		echo B >> file2 && git add file2 && GIT_COMMITTER_DATE="2020-01-01 15:02" git commit -m B &&
 		git tag B -a -m B &&
-		git merge --no-ff --allow-unrelated-histories main -m x &&
-
-		check_describe "B-3-gHASH" HEAD
+		git merge --no-ff --allow-unrelated-histories main -m x
 	)
 '
 
+(
+	cd disjoint2 &&
+	check_describe "B-3-gHASH" HEAD
+)
+
 test_done