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-rwxr-xr-xt/t2015-checkout-unborn.sh64
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diff --git a/t/t2015-checkout-unborn.sh b/t/t2015-checkout-unborn.sh
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+++ b/t/t2015-checkout-unborn.sh
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+#!/bin/sh
+
+test_description='checkout from unborn branch'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+ mkdir parent &&
+ (cd parent &&
+ git init &&
+ echo content >file &&
+ git add file &&
+ git commit -m base
+ ) &&
+ git fetch parent main:origin
+'
+
+test_expect_success 'checkout from unborn preserves untracked files' '
+ echo precious >expect &&
+ echo precious >file &&
+ test_must_fail git checkout -b new origin &&
+ test_cmp expect file
+'
+
+test_expect_success 'checkout from unborn preserves index contents' '
+ echo precious >expect &&
+ echo precious >file &&
+ git add file &&
+ test_must_fail git checkout -b new origin &&
+ test_cmp expect file &&
+ git show :file >file &&
+ test_cmp expect file
+'
+
+test_expect_success 'checkout from unborn merges identical index contents' '
+ echo content >file &&
+ git add file &&
+ git checkout -b new origin
+'
+
+test_expect_success 'checking out another branch from unborn state' '
+ git checkout --orphan newroot &&
+ git checkout -b anothername &&
+ test_must_fail git show-ref --verify refs/heads/newroot &&
+ git symbolic-ref HEAD >actual &&
+ echo refs/heads/anothername >expect &&
+ test_cmp expect actual
+'
+
+test_expect_success 'checking out in a newly created repo' '
+ test_create_repo empty &&
+ (
+ cd empty &&
+ git symbolic-ref HEAD >expect &&
+ test_must_fail git checkout &&
+ git symbolic-ref HEAD >actual &&
+ test_cmp expect actual
+ )
+'
+
+test_done