Refactor unit test runner (#2294)

Properly discovers the permissions needed for each test.

tools/util.py

@@ -329,28 +329,6 @@ def enable_ansi_colors_win10():
     return True
 
 
-def parse_unit_test_output(output, print_to_stdout):
-    expected = None
-    actual = None
-    result = None
-    for line in iter(output.readline, ''):
-        if expected is None:
-            # expect "running 30 tests"
-            expected = extract_number(r'running (\d+) tests', line)
-        elif "test result:" in line:
-            result = line
-        if print_to_stdout:
-            sys.stdout.write(line)
-            sys.stdout.flush()
-    # Check that the number of expected tests equals what was reported at the
-    # bottom.
-    if result:
-        # result should be a string like this:
-        # "test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; ..."
-        actual = extract_number(r'(\d+) passed', result)
-    return (actual, expected)
-
-
 def extract_number(pattern, string):
     matches = re.findall(pattern, string)
     if len(matches) != 1: