t: add tests for switch

Signed-off-by: NNguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

t/t2060-switch.sh

+#!/bin/sh
+
+test_description='switch basic functionality'
+
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	test_commit first &&
+	git branch first-branch &&
+	test_commit second &&
+	test_commit third &&
+	git remote add origin nohost:/nopath &&
+	git update-ref refs/remotes/origin/foo first-branch
+'
+
+test_expect_success 'switch branch no arguments' '
+	test_must_fail git switch
+'
+
+test_expect_success 'switch branch' '
+	git switch first-branch &&
+	test_path_is_missing second.t
+'
+
+test_expect_success 'switch and detach' '
+	test_when_finished git switch master &&
+	test_must_fail git switch master^{commit} &&
+	git switch --detach master^{commit} &&
+	test_must_fail git symbolic-ref HEAD
+'
+
+test_expect_success 'switch and detach current branch' '
+	test_when_finished git switch master &&
+	git switch master &&
+	git switch --detach &&
+	test_must_fail git symbolic-ref HEAD
+'
+
+test_expect_success 'switch and create branch' '
+	test_when_finished git switch master &&
+	git switch -c temp master^ &&
+	test_cmp_rev master^ refs/heads/temp &&
+	echo refs/heads/temp >expected-branch &&
+	git symbolic-ref HEAD >actual-branch &&
+	test_cmp expected-branch actual-branch
+'
+
+test_expect_success 'force create branch from HEAD' '
+	test_when_finished git switch master &&
+	git switch --detach master &&
+	test_must_fail git switch -c temp &&
+	git switch -C temp &&
+	test_cmp_rev master refs/heads/temp &&
+	echo refs/heads/temp >expected-branch &&
+	git symbolic-ref HEAD >actual-branch &&
+	test_cmp expected-branch actual-branch
+'
+
+test_expect_success 'new orphan branch from empty' '
+	test_when_finished git switch master &&
+	test_must_fail git switch --orphan new-orphan HEAD &&
+	git switch --orphan new-orphan &&
+	test_commit orphan &&
+	git cat-file commit refs/heads/new-orphan >commit &&
+	! grep ^parent commit &&
+	git ls-files >tracked-files &&
+	echo orphan.t >expected &&
+	test_cmp expected tracked-files
+'
+
+test_expect_success 'switching ignores file of same branch name' '
+	test_when_finished git switch master &&
+	: >first-branch &&
+	git switch first-branch &&
+	echo refs/heads/first-branch >expected &&
+	git symbolic-ref HEAD >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'guess and create branch ' '
+	test_when_finished git switch master &&
+	test_must_fail git switch --no-guess foo &&
+	git switch foo &&
+	echo refs/heads/foo >expected &&
+	git symbolic-ref HEAD >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'not switching when something is in progress' '
+	test_when_finished rm -f .git/MERGE_HEAD &&
+	# fake a merge-in-progress
+	cp .git/HEAD .git/MERGE_HEAD &&
+	test_must_fail git switch -d @^
+'
+
+test_done