reset: expand test coverage in sparse checkout

Add tests for `--merge` and `--keep` modes, as well as (mixed) reset with
pathspecs both inside and outside of the sparse checkout definition.

Signed-off-by: Victoria Dye <vdye@github.com>

t/t1092-sparse-checkout-compatibility.sh

@@ -655,6 +655,87 @@ test_expect_success 'checkout and mixed reset file tracking [sparse]' '
 	test_path_exists full-checkout/folder1
 '
 
+test_expect_success 'checkout and reset (merge)' '
+	init_repos &&
+
+	write_script edit-contents <<-\EOF &&
+	echo text >>$1
+	EOF
+
+	test_all_match git checkout -b reset-test update-deep &&
+	run_on_all ../edit-contents a &&
+	test_all_match git reset --merge deepest &&
+	test_all_match git status --porcelain=v2 &&
+
+	test_all_match git reset --hard update-deep &&
+	run_on_all ../edit-contents deep/a &&
+	test_all_match test_must_fail git reset --merge deepest
+'
+
+test_expect_success 'checkout and reset (keep)' '
+	init_repos &&
+
+	write_script edit-contents <<-\EOF &&
+	echo text >>$1
+	EOF
+
+	test_all_match git checkout -b reset-test update-deep &&
+	run_on_all ../edit-contents a &&
+	test_all_match git reset --keep deepest &&
+	test_all_match git status --porcelain=v2 &&
+
+	test_all_match git reset --hard update-deep &&
+	run_on_all ../edit-contents deep/a &&
+	test_all_match test_must_fail git reset --keep deepest
+'
+
+test_expect_success 'reset with pathspecs inside sparse definition' '
+	init_repos &&
+
+	write_script edit-contents <<-\EOF &&
+	echo text >>$1
+	EOF
+
+	test_all_match git checkout -b reset-test update-deep &&
+	run_on_all ../edit-contents deep/a &&
+
+	test_all_match git reset base -- deep/a &&
+	test_all_match git status --porcelain=v2 &&
+
+	test_all_match git reset base -- nonexistent-file &&
+	test_all_match git status --porcelain=v2 &&
+
+	test_all_match git reset deepest -- deep &&
+	test_all_match git status --porcelain=v2
+'
+
+test_expect_success 'reset with sparse directory pathspec outside definition' '
+	init_repos &&
+
+	test_all_match git checkout -b reset-test update-deep &&
+	test_all_match git reset --hard update-folder1 &&
+	test_all_match git reset base -- folder1 &&
+	test_all_match git status --porcelain=v2
+'
+
+test_expect_success 'reset with file pathspec outside sparse definition' '
+	init_repos &&
+
+	test_all_match git checkout -b reset-test update-deep &&
+	test_all_match git reset --hard update-folder1 &&
+	test_all_match git reset base -- folder1/a &&
+	test_all_match git status --porcelain=v2
+'
+
+test_expect_success 'reset with wildcard pathspec' '
+	init_repos &&
+
+	test_all_match git checkout -b reset-test update-deep &&
+	test_all_match git reset --hard update-folder1 &&
+	test_all_match git reset base -- \*/a &&
+	test_all_match git status --porcelain=v2
+'
+
 test_expect_success 'merge, cherry-pick, and rebase' '
 	init_repos &&