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-rwxr-xr-xt/t2011-checkout-invalid-head.sh61
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diff --git a/t/t2011-checkout-invalid-head.sh b/t/t2011-checkout-invalid-head.sh
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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 $ZERO_OID >.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_expect_success 'create ref directory/file conflict scenario' '
+ git update-ref refs/heads/outer/inner master &&
+
+ # do not rely on symbolic-ref to get a known state,
+ # as it may use the same code we are testing
+ reset_to_df () {
+ echo "ref: refs/heads/outer" >.git/HEAD
+ }
+'
+
+test_expect_success 'checkout away from d/f HEAD (unpacked, to branch)' '
+ reset_to_df &&
+ git checkout master
+'
+
+test_expect_success 'checkout away from d/f HEAD (unpacked, to detached)' '
+ reset_to_df &&
+ git checkout --detach master
+'
+
+test_expect_success 'pack refs' '
+ git pack-refs --all --prune
+'
+
+test_expect_success 'checkout away from d/f HEAD (packed, to branch)' '
+ reset_to_df &&
+ git checkout master
+'
+
+test_expect_success 'checkout away from d/f HEAD (packed, to detached)' '
+ reset_to_df &&
+ git checkout --detach master
+'
+test_done