Merge branch 'sg/split-index-test' into maint

Test updates.

* sg/split-index-test:
  t0090: disable GIT_TEST_SPLIT_INDEX for the test checking split index
  t1700-split-index: drop unnecessary 'grep'

t/t0090-cache-tree.sh

@@ -261,6 +261,8 @@ test_expect_success 'no phantom error when switching trees' '
 '
 
 test_expect_success 'switching trees does not invalidate shared index' '
+	(
+		sane_unset GIT_TEST_SPLIT_INDEX &&
 		git update-index --split-index &&
 		>split &&
 		git add split &&
@@ -268,6 +270,7 @@ test_expect_success 'switching trees does not invalidate shared index' '
 		git commit -m "as-is" &&
 		test-tool dump-split-index .git/index | grep -v ^own >after &&
 		test_cmp before after
+	)
 '
 
 test_done

t/t1700-split-index.sh

@@ -67,7 +67,7 @@ test_expect_success 'disable split index' '
 	EOF
 	test_cmp ls-files.expect ls-files.actual &&
 
-	BASE=$(test-tool dump-split-index .git/index | grep "^own" | sed "s/own/base/") &&
+	BASE=$(test-tool dump-split-index .git/index | sed -n "s/^own/base/p") &&
 	test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
 	cat >expect <<-EOF &&
 	not a split index