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#!/bin/sh
test_description='checkout switching away from an invalid branch'
. ./test-lib.sh
test_expect_success 'setup' '
echo hello >world &&
git add world &&
git commit -m initial
'
test_expect_success 'checkout should not start branch from a tree' '
test_must_fail git checkout -b newbranch master^{tree}
'
test_expect_success 'checkout master from invalid HEAD' '
echo $_z40 >.git/HEAD &&
git checkout master --
'
test_expect_success 'checkout notices failure to lock HEAD' '
test_when_finished "rm -f .git/HEAD.lock" &&
>.git/HEAD.lock &&
test_must_fail git checkout -b other
'
test_done
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