[PATCH 2/6] t7408: merge short tests, factor out testing method

[Stefan Beller <sbeller@google.com>]

Tests consisting of one line each can be consolidated to have fewer tests
to run as well as fewer lines of code.

When having just a few git commands, do not create a new shell but
use the -C flag in Git to execute in the correct directory.

Signed-off-by: Stefan Beller <sbeller@google.com>
---
 t/t7408-submodule-reference.sh | 50 +++++++++++++++---------------------------
 1 file changed, 18 insertions(+), 32 deletions(-)

diff --git a/t/t7408-submodule-reference.sh b/t/t7408-submodule-reference.sh
index afcc629..1416cbd 100755
--- a/t/t7408-submodule-reference.sh
+++ b/t/t7408-submodule-reference.sh
@@ -10,6 +10,16 @@ base_dir=$(pwd)
 
 U=$base_dir/UPLOAD_LOG
 
+test_alternate_usage()
+{
+	alternates_file=$1
+	working_dir=$2
+	test_line_count = 1 $alternates_file &&
+	echo "0 objects, 0 kilobytes" >expect &&
+	git -C $working_dir count-objects >current &&
+	diff expect current
+}
+
 test_expect_success 'preparing first repository' '
 	test_create_repo A &&
 	(
@@ -42,44 +52,20 @@ test_expect_success 'preparing superproject' '
 	)
 '
 
-test_expect_success 'submodule add --reference' '
+test_expect_success 'submodule add --reference uses alternates' '
 	(
 		cd super &&
 		git submodule add --reference ../B "file://$base_dir/A" sub &&
 		git commit -m B-super-added
-	)
-'
-
-test_expect_success 'after add: existence of info/alternates' '
-	test_line_count = 1 super/.git/modules/sub/objects/info/alternates
-'
-
-test_expect_success 'that reference gets used with add' '
-	(
-		cd super/sub &&
-		echo "0 objects, 0 kilobytes" > expected &&
-		git count-objects > current &&
-		diff expected current
-	)
-'
-
-test_expect_success 'cloning superproject' '
-	git clone super super-clone
-'
-
-test_expect_success 'update with reference' '
-	cd super-clone && git submodule update --init --reference ../B
-'
-
-test_expect_success 'after update: existence of info/alternates' '
-	test_line_count = 1 super-clone/.git/modules/sub/objects/info/alternates
+	) &&
+	test_alternate_usage super/.git/modules/sub/objects/info/alternates super/sub
 '
 
-test_expect_success 'that reference gets used with update' '
-	cd super-clone/sub &&
-	echo "0 objects, 0 kilobytes" > expected &&
-	git count-objects > current &&
-	diff expected current
+test_expect_success 'updating superproject keeps alternates' '
+	test_when_finished "rm -rf super-clone" &&
+	git clone super super-clone &&
+	git -C super-clone submodule update --init --reference ../B &&
+	test_alternate_usage super-clone/.git/modules/sub/objects/info/alternates super-clone/sub
 '
 
 test_done
-- 
2.9.2.572.g9d9644e.dirty