Merge #16390: qa: Add --filter option to test_runner.py

1a6242526093424947eb49f3416dc0c6bc9fc3a8 qa: Add --filter option to test_runner.py (João Barbosa)

Pull request description:

  Allows to run functional tests like:
  ```sh
  test/functional/test_runner.py --filter wallet
  ```

ACKs for top commit:
  jonatack:
    ACK 1a6242526093424947eb49f3416dc0c6bc9fc3a8

Tree-SHA512: 53199e01da3b2e0112843c1c68c69d8fd7fc9bb6a6cb45a81c324973c4824ebf5fef574f9efab81a64d52e397e25d979ae40f0eaba35afb771e80012768f0b08

test/functional/test_runner.py

@@ -234,6 +234,7 @@ def main():
     parser.add_argument('--quiet', '-q', action='store_true', help='only print dots, results summary and failure logs')
     parser.add_argument('--tmpdirprefix', '-t', default=tempfile.gettempdir(), help="Root directory for datadirs")
     parser.add_argument('--failfast', action='store_true', help='stop execution after the first test failure')
+    parser.add_argument('--filter', help='filter scripts to run by regular expression')
     args, unknown_args = parser.parse_known_args()
 
     # args to be passed on always start with two dashes; tests are the remaining unknown args
@@ -294,6 +295,9 @@ def main():
             if not exclude_list:
                 print("{}WARNING!{} Test '{}' not found in current test list.".format(BOLD[1], BOLD[0], exclude_test))
 
+    if args.filter:
+        test_list = list(filter(re.compile(args.filter).search, test_list))
+
     if not test_list:
         print("No valid test scripts specified. Check that your test is in one "
               "of the test lists in test_runner.py, or run test_runner.py with no arguments to run all tests")