add tests of commit --squash

t7500: test expected behavior of commit --squash
t3415: test interaction of commit --squash with rebase --autosquash
t3900: test commit --squash with i18n encodings

Signed-off-by: Pat Notz <patnotz@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/t/t7500-commit.sh b/t/t7500-commit.sh
index a41b819..162527c 100755
--- a/t/t7500-commit.sh
+++ b/t/t7500-commit.sh
@@ -238,10 +238,57 @@
 	commit_msg_is "fixup! target message subject line"
 '
 
+test_expect_success 'commit --squash works with -F' '
+	commit_for_rebase_autosquash_setup &&
+	echo "log message from file" >msgfile &&
+	git commit --squash HEAD~1 -F msgfile  &&
+	commit_msg_is "squash! target message subject linelog message from file"
+'
+
+test_expect_success 'commit --squash works with -m' '
+	commit_for_rebase_autosquash_setup &&
+	git commit --squash HEAD~1 -m "foo bar\nbaz" &&
+	commit_msg_is "squash! target message subject linefoo bar\nbaz"
+'
+
+test_expect_success 'commit --squash works with -C' '
+	commit_for_rebase_autosquash_setup &&
+	git commit --squash HEAD~1 -C HEAD &&
+	commit_msg_is "squash! target message subject lineintermediate commit"
+'
+
+test_expect_success 'commit --squash works with -c' '
+	commit_for_rebase_autosquash_setup &&
+	test_set_editor "$TEST_DIRECTORY"/t7500/edit-content &&
+	git commit --squash HEAD~1 -c HEAD &&
+	commit_msg_is "squash! target message subject lineedited commit"
+'
+
+test_expect_success 'commit --squash works with -C for same commit' '
+	commit_for_rebase_autosquash_setup &&
+	git commit --squash HEAD -C HEAD &&
+	commit_msg_is "squash! intermediate commit"
+'
+
+test_expect_success 'commit --squash works with -c for same commit' '
+	commit_for_rebase_autosquash_setup &&
+	test_set_editor "$TEST_DIRECTORY"/t7500/edit-content &&
+	git commit --squash HEAD -c HEAD &&
+	commit_msg_is "squash! edited commit"
+'
+
+test_expect_success 'commit --squash works with editor' '
+	commit_for_rebase_autosquash_setup &&
+	test_set_editor "$TEST_DIRECTORY"/t7500/add-content &&
+	git commit --squash HEAD~1 &&
+	commit_msg_is "squash! target message subject linecommit message"
+'
+
 test_expect_success 'invalid message options when using --fixup' '
 	echo changes >>foo &&
 	echo "message" >log &&
 	git add foo &&
+	test_must_fail git commit --fixup HEAD~1 --squash HEAD~2 &&
 	test_must_fail git commit --fixup HEAD~1 -C HEAD~2 &&
 	test_must_fail git commit --fixup HEAD~1 -c HEAD~2 &&
 	test_must_fail git commit --fixup HEAD~1 -m "cmdline message" &&