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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 $_z40 >.git/HEAD &&
+ git checkout master --
+'
+
+test_done