test: QL_VERBOSE.DISASM implicitly uses r2.disassembler

see https://github.com/qilingframework/qiling/issues/1396

tests/test_r2.py

@@ -1,12 +1,14 @@
 #!/usr/bin/env python3
 
 import unittest
+from io import StringIO
 
 import sys
 sys.path.append("..")
 
 from qiling import Qiling
-from qiling.const import QL_ARCH, QL_VERBOSE
+from qiling.const import QL_ARCH, QL_INTERCEPT, QL_OS, QL_VERBOSE
+from tests.test_shellcode import ARM64_LIN, graceful_execve
 
 try:
     from qiling.extensions.r2.r2 import R2
@@ -59,6 +61,20 @@ class R2Test(unittest.TestCase):
         print(r2.where('main'))
         self.assertEqual(r2.at(r2.where('main')), 'main')
 
+    def test_disasm_monkeypatch(self):
+        # QlArchUtils.setup_output(QL_VERBOSE.DISASM) implicitly uses r2.disassembler if available
+        # see https://github.com/qilingframework/qiling/issues/1396
+        ql = Qiling(code=ARM64_LIN, archtype=QL_ARCH.ARM64, ostype=QL_OS.LINUX, verbose=QL_VERBOSE.DISASM)
+        ql.os.set_syscall('execve', graceful_execve, QL_INTERCEPT.EXIT)
+
+        # store ql log output in a string
+        ql_log = StringIO()
+        ql.log.handlers[0].setStream(ql_log)
+        ql.run()
+
+        ql_log_str = ql_log.getvalue()
+        self.assertFalse('invalid' in ql_log_str)
+        self.assertTrue('adr                  x1, #0x11ff058' in ql_log_str)
 
 if __name__ == "__main__":
     unittest.main()