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-rwxr-xr-xthird_party/git/t/t2106-update-index-assume-unchanged.sh24
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diff --git a/third_party/git/t/t2106-update-index-assume-unchanged.sh b/third_party/git/t/t2106-update-index-assume-unchanged.sh
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index 0000000000..99d858c6b7
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+++ b/third_party/git/t/t2106-update-index-assume-unchanged.sh
@@ -0,0 +1,24 @@
+#!/bin/sh
+
+test_description='git update-index --assume-unchanged test.
+'
+
+. ./test-lib.sh
+
+test_expect_success 'setup' \
+	': >file &&
+	 git add file &&
+	 git commit -m initial &&
+	 git branch other &&
+	 echo upstream >file &&
+	 git add file &&
+	 git commit -m upstream'
+
+test_expect_success 'do not switch branches with dirty file' \
+	'git reset --hard &&
+	 git checkout other &&
+	 echo dirt >file &&
+	 git update-index --assume-unchanged file &&
+	 test_must_fail git checkout master'
+
+test_done