LHA/LZH: Add clamscan tests

Added a test that verifies extraction of two specific files from a set
of LZH files created with this utility:

https://github.com/jca02266/lha

unit_tests/clamscan/lzh_lha_archive_test.py

@@ -0,0 +1,59 @@
+# Copyright (C) 2020-2024 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+
+"""
+Run clamscan tests.
+"""
+
+import sys
+
+sys.path.append('../unit_tests')
+import testcase
+
+
+class TC(testcase.TestCase):
+    @classmethod
+    def setUpClass(cls):
+        super(TC, cls).setUpClass()
+
+        # Testing with our logo png file.
+        TC.testfiles = list(TC.path_source.glob('unit_tests/input/other_scanfiles/lha_lzh/*.lzh'))
+
+    @classmethod
+    def tearDownClass(cls):
+        super(TC, cls).tearDownClass()
+
+    def setUp(self):
+        super(TC, self).setUp()
+
+    def tearDown(self):
+        super(TC, self).tearDown()
+        self.verify_valgrind_log()
+
+    def test_good_archives(self):
+        self.step_name('Verify that these LHA archives containing logo.png and cisco-logo.png correctly extract each.')
+
+        (TC.path_tmp / 'good.ldb').write_text(
+            "logo.png;Engine:150-255,Target:0;0;fuzzy_img#af2ad01ed42993c7#0\n"
+            "cisco-logo.png;Engine:150-255,Target:0;0;fuzzy_img#9463944473afd82f#0\n"
+        )
+
+        testfiles = ' '.join([str(testfile) for testfile in TC.testfiles])
+
+        command = '{valgrind} {valgrind_args} {clamscan} -d {path_db} {testfiles} --allmatch'.format(
+            valgrind=TC.valgrind, valgrind_args=TC.valgrind_args, clamscan=TC.clamscan,
+            path_db=TC.path_tmp / 'good.ldb',
+            testfiles=testfiles,
+        )
+        output = self.execute_command(command)
+
+        assert output.ec == 1  # virus
+        assert output.out.count(' logo.png.UNOFFICIAL FOUND') == len(TC.testfiles)
+        assert output.out.count(' cisco-logo.png.UNOFFICIAL FOUND') == len(TC.testfiles)
+
+        expected_stdout = [
+            'logo.png.UNOFFICIAL FOUND',
+        ]
+        unexpected_stdout = [
+            'OK',
+        ]
+        self.verify_output(output.out, expected=expected_stdout)