t7419, t7420: use test_cmp_config instead of grepping .gitmodules

We have a test function to verify config files. Use it as it's more
precise.

Signed-off-by: Jan Alexander Steffens (heftig) <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: heftig

t/t7419-submodule-set-branch.sh

@@ -44,14 +44,14 @@ test_expect_success 'submodule config cache setup' '
 
 test_expect_success 'ensure submodule branch is unset' '
 	(cd super &&
-		! grep branch .gitmodules
+		test_cmp_config "" -f .gitmodules --default "" submodule.submodule.branch
 	)
 '
 
 test_expect_success 'test submodule set-branch --branch' '
 	(cd super &&
 		git submodule set-branch --branch topic submodule &&
-		grep "branch = topic" .gitmodules &&
+		test_cmp_config topic -f .gitmodules submodule.submodule.branch &&
 		git submodule update --remote &&
 		cat <<-\EOF >expect &&
 		b
@@ -64,7 +64,7 @@ test_expect_success 'test submodule set-branch --branch' '
 test_expect_success 'test submodule set-branch --default' '
 	(cd super &&
 		git submodule set-branch --default submodule &&
-		! grep branch .gitmodules &&
+		test_cmp_config "" -f .gitmodules --default "" submodule.submodule.branch &&
 		git submodule update --remote &&
 		cat <<-\EOF >expect &&
 		a
@@ -77,7 +77,7 @@ test_expect_success 'test submodule set-branch --default' '
 test_expect_success 'test submodule set-branch -b' '
 	(cd super &&
 		git submodule set-branch -b topic submodule &&
-		grep "branch = topic" .gitmodules &&
+		test_cmp_config topic -f .gitmodules submodule.submodule.branch &&
 		git submodule update --remote &&
 		cat <<-\EOF >expect &&
 		b
@@ -90,7 +90,7 @@ test_expect_success 'test submodule set-branch -b' '
 test_expect_success 'test submodule set-branch -d' '
 	(cd super &&
 		git submodule set-branch -d submodule &&
-		! grep branch .gitmodules &&
+		test_cmp_config "" -f .gitmodules --default "" submodule.submodule.branch &&
 		git submodule update --remote &&
 		cat <<-\EOF >expect &&
 		a

t/t7420-submodule-set-url.sh

@@ -49,7 +49,7 @@ test_expect_success 'test submodule set-url' '
 		cd super &&
 		test_must_fail git submodule update --remote &&
 		git submodule set-url submodule ../newsubmodule &&
-		grep -F "url = ../newsubmodule" .gitmodules &&
+		test_cmp_config ../newsubmodule -f .gitmodules submodule.submodule.url &&
 		git submodule update --remote
 	) &&
 	git -C super/submodule show >actual &&