)
'
+test_expect_success 'reading submodules config from the working tree with "submodule--helper config"' '
+ (cd super &&
+ echo "../submodule" >expect &&
+ git submodule--helper config submodule.submodule.url >actual &&
+ test_cmp expect actual
+ )
+'
+
+test_expect_success 'unsetting submodules config from the working tree with "submodule--helper config --unset"' '
+ (cd super &&
+ git submodule--helper config --unset submodule.submodule.url &&
+ git submodule--helper config submodule.submodule.url >actual &&
+ test_must_be_empty actual
+ )
+'
+
+
+test_expect_success 'writing submodules config with "submodule--helper config"' '
+ (cd super &&
+ echo "new_url" >expect &&
+ git submodule--helper config submodule.submodule.url "new_url" &&
+ git submodule--helper config submodule.submodule.url >actual &&
+ test_cmp expect actual
+ )
+'
+
+test_expect_success 'overwriting unstaged submodules config with "submodule--helper config"' '
+ test_when_finished "git -C super checkout .gitmodules" &&
+ (cd super &&
+ echo "newer_url" >expect &&
+ git submodule--helper config submodule.submodule.url "newer_url" &&
+ git submodule--helper config submodule.submodule.url >actual &&
+ test_cmp expect actual
+ )
+'
+
+test_expect_success 'writeable .gitmodules when it is in the working tree' '
+ git -C super submodule--helper config --check-writeable
+'
+
+test_expect_success 'writeable .gitmodules when it is nowhere in the repository' '
+ ORIG=$(git -C super rev-parse HEAD) &&
+ test_when_finished "git -C super reset --hard $ORIG" &&
+ (cd super &&
+ git rm .gitmodules &&
+ git commit -m "remove .gitmodules from the current branch" &&
+ git submodule--helper config --check-writeable
+ )
+'
+
+test_expect_success 'non-writeable .gitmodules when it is in the index but not in the working tree' '
+ test_when_finished "git -C super checkout .gitmodules" &&
+ (cd super &&
+ rm -f .gitmodules &&
+ test_must_fail git submodule--helper config --check-writeable
+ )
+'
+
+test_expect_success 'non-writeable .gitmodules when it is in the current branch but not in the index' '
+ ORIG=$(git -C super rev-parse HEAD) &&
+ test_when_finished "git -C super reset --hard $ORIG" &&
+ (cd super &&
+ git rm .gitmodules &&
+ test_must_fail git submodule--helper config --check-writeable
+ )
+'
+
+test_expect_success 'reading submodules config from the index when .gitmodules is not in the working tree' '
+ ORIG=$(git -C super rev-parse HEAD) &&
+ test_when_finished "git -C super reset --hard $ORIG" &&
+ (cd super &&
+ git submodule--helper config submodule.submodule.url "staged_url" &&
+ git add .gitmodules &&
+ rm -f .gitmodules &&
+ echo "staged_url" >expect &&
+ git submodule--helper config submodule.submodule.url >actual &&
+ test_cmp expect actual
+ )
+'
+
+test_expect_success 'reading submodules config from the current branch when .gitmodules is not in the index' '
+ ORIG=$(git -C super rev-parse HEAD) &&
+ test_when_finished "git -C super reset --hard $ORIG" &&
+ (cd super &&
+ git rm .gitmodules &&
+ echo "../submodule" >expect &&
+ git submodule--helper config submodule.submodule.url >actual &&
+ test_cmp expect actual
+ )
+'
+
+test_expect_success 'reading nested submodules config' '
+ (cd super &&
+ git init submodule/nested_submodule &&
+ echo "a" >submodule/nested_submodule/a &&
+ git -C submodule/nested_submodule add a &&
+ git -C submodule/nested_submodule commit -m "add a" &&
+ git -C submodule submodule add ./nested_submodule &&
+ git -C submodule add nested_submodule &&
+ git -C submodule commit -m "added nested_submodule" &&
+ git add submodule &&
+ git commit -m "updated submodule" &&
+ echo "./nested_submodule" >expect &&
+ test-tool submodule-nested-repo-config \
+ submodule submodule.nested_submodule.url >actual &&
+ test_cmp expect actual
+ )
+'
+
+test_expect_success 'reading nested submodules config when .gitmodules is not in the working tree' '
+ test_when_finished "git -C super/submodule checkout .gitmodules" &&
+ (cd super &&
+ echo "./nested_submodule" >expect &&
+ rm submodule/.gitmodules &&
+ test-tool submodule-nested-repo-config \
+ submodule submodule.nested_submodule.url >actual 2>warning &&
+ test_must_be_empty warning &&
+ test_cmp expect actual
+ )
+'
+
test_done