Test what exit code and output we emit on "git submodule -h", how we
handle "--" when no subcommand is specified, and how the top-level
"--recursive" option is handled.

For "-h" this doesn't make sense, but let's test for it so that any
subsequent eventual behavior change will become clear.

For "--" this follows up on 68cabbfda36 (submodule: document default
behavior, 2019-02-15) and tests that "status" doesn't support
the "--" delimiter. There's no intrinsically good reason not to
support that. We behave this way due to edge cases in
git-submodule.sh's implementation, but as with "-h" let's assert our
current long-standing behavior for now.

For "--recursive" the exclusion of it from the top-level appears to
have been an omission in 15fc56a8536 (git submodule foreach: Add
--recursive to recurse into nested submodules, 2009-08-19), there
doesn't seem to be a reason not to support it alongside "--quiet" and
"--cached", but let's likewise assert our existing behavior for now.

I.e. as long as "status" is optional it would make sense to support
all of its options when it's omitted, but we only do that with
"--quiet" and "--cached", and curiously omit "--recursive".

Signed-off-by: Ævar Arnfjörð Bjarmason <redacted>
---
 t/t7400-submodule-basic.sh | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/t/t7400-submodule-basic.sh b/t/t7400-submodule-basic.sh
index e7cec2e457a..b858871a953 100755
--- a/t/t7400-submodule-basic.sh
+++ b/t/t7400-submodule-basic.sh

@@ -14,6 +14,32 @@ export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
 
+test_expect_success 'submodule usage: -h' '
+	git submodule -h >out 2>err &&
+	grep "^usage: git submodule" out &&
+	test_must_be_empty err
+'
+
+test_expect_success 'submodule usage: --recursive' '
+	test_expect_code 1 git submodule --recursive >out 2>err &&
+	grep "^usage: git submodule" err &&
+	test_must_be_empty out
+'
+
+test_expect_success 'submodule usage: status --' '
+	test_expect_code 1 git submodule -- &&
+	test_expect_code 1 git submodule --end-of-options
+'
+
+for opt in '--quiet' '--cached'
+do
+	test_expect_success "submodule usage: status $opt" '
+		git submodule $opt &&
+		git submodule status $opt &&
+		git submodule $opt status
+	'
+done
+
 test_expect_success 'submodule deinit works on empty repository' '
 	git submodule deinit --all
 '

-- 
2.37.2.1279.g64dec4e13cf