t7406: "git submodule update {--merge|--rebase]" with new submodules

Add two test cases in t7406 to ensure that the --merge/--rebase options
are ignored for "git submodule update" with new modules.  These test that
a simple checkout is performed instead.

Signed-off-by: Spencer E. Olson <olsonse@umich.edu>
Acked-by: Jens Lehmann <Jens.Lehmann@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t7406-submodule-update.sh

@@ -203,4 +203,56 @@ test_expect_success 'submodule init picks up merge' '
 	)
 '
 
+test_expect_success 'submodule update --merge  - ignores --merge  for new submodules' '
+	(cd super &&
+	 rm -rf submodule &&
+	 git submodule update submodule &&
+	 git status -s submodule >expect &&
+	 rm -rf submodule &&
+	 git submodule update --merge submodule &&
+	 git status -s submodule >actual &&
+	 test_cmp expect actual
+	)
+'
+
+test_expect_success 'submodule update --rebase - ignores --rebase for new submodules' '
+	(cd super &&
+	 rm -rf submodule &&
+	 git submodule update submodule &&
+	 git status -s submodule >expect &&
+	 rm -rf submodule &&
+	 git submodule update --rebase submodule &&
+	 git status -s submodule >actual &&
+	 test_cmp expect actual
+	)
+'
+
+test_expect_success 'submodule update ignores update=merge config for new submodules' '
+	(cd super &&
+	 rm -rf submodule &&
+	 git submodule update submodule &&
+	 git status -s submodule >expect &&
+	 rm -rf submodule &&
+	 git config submodule.submodule.update merge &&
+	 git submodule update submodule &&
+	 git status -s submodule >actual &&
+	 git config --unset submodule.submodule.update &&
+	 test_cmp expect actual
+	)
+'
+
+test_expect_success 'submodule update ignores update=rebase config for new submodules' '
+	(cd super &&
+	 rm -rf submodule &&
+	 git submodule update submodule &&
+	 git status -s submodule >expect &&
+	 rm -rf submodule &&
+	 git config submodule.submodule.update rebase &&
+	 git submodule update submodule &&
+	 git status -s submodule >actual &&
+	 git config --unset submodule.submodule.update &&
+	 test_cmp expect actual
+	)
+'
+
 test_done