diff --git a/test/functional/framework_test_script.py b/test/functional/framework_test_script.py
new file mode 100755
--- /dev/null
+++ b/test/functional/framework_test_script.py
@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+# Copyright (c) 2020 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Tests for test_framework.script."""
+
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.script import bn2vch
+from test_framework.util import assert_equal
+
+
+def test_bn2vch():
+    assert_equal(bn2vch(0), bytes([]))
+    assert_equal(bn2vch(1), bytes([0x01]))
+    assert_equal(bn2vch(-1), bytes([0x81]))
+    assert_equal(bn2vch(0x7F), bytes([0x7F]))
+    assert_equal(bn2vch(-0x7F), bytes([0xFF]))
+    assert_equal(bn2vch(0x80), bytes([0x80, 0x00]))
+    assert_equal(bn2vch(-0x80), bytes([0x80, 0x80]))
+    assert_equal(bn2vch(0xFF), bytes([0xFF, 0x00]))
+    assert_equal(bn2vch(-0xFF), bytes([0xFF, 0x80]))
+    assert_equal(bn2vch(0x100), bytes([0x00, 0x01]))
+    assert_equal(bn2vch(-0x100), bytes([0x00, 0x81]))
+    assert_equal(bn2vch(0x7FFF), bytes([0xFF, 0x7F]))
+    assert_equal(bn2vch(-0x8000), bytes([0x00, 0x80, 0x80]))
+    assert_equal(bn2vch(-0x7FFFFF), bytes([0xFF, 0xFF, 0xFF]))
+    assert_equal(bn2vch(0x80000000), bytes([0x00, 0x00, 0x00, 0x80, 0x00]))
+    assert_equal(bn2vch(-0x80000000), bytes([0x00, 0x00, 0x00, 0x80, 0x80]))
+    assert_equal(bn2vch(0xFFFFFFFF), bytes([0xFF, 0xFF, 0xFF, 0xFF, 0x00]))
+
+    assert_equal(bn2vch(123456789), bytes([0x15, 0xCD, 0x5B, 0x07]))
+    assert_equal(bn2vch(-54321), bytes([0x31, 0xD4, 0x80]))
+
+
+class FrameworkTestScript(BitcoinTestFramework):
+    def setup_network(self):
+        pass
+
+    def set_test_params(self):
+        self.num_nodes = 0
+
+    def run_test(self):
+        test_bn2vch()
+
+
+if __name__ == '__main__':
+    FrameworkTestScript().main()
diff --git a/test/functional/test_runner.py b/test/functional/test_runner.py
--- a/test/functional/test_runner.py
+++ b/test/functional/test_runner.py
@@ -656,7 +656,7 @@
     LEEWAY = 0
 
     good_prefixes_re = re.compile(
-        "(abc_)?(example|feature|interface|mempool|mining|p2p|rpc|wallet|tool)_")
+        "(abc_)?(example|feature|interface|mempool|mining|p2p|rpc|wallet|tool|framework_test)_")
     bad_script_names = [
         script for script in all_scripts if good_prefixes_re.match(script) is None]