mtest: fix a couple of minor whitespace / typing issues

mesonbuild/mtest.py

@@ -233,7 +233,7 @@ class TestResult(enum.Enum):
 
     @staticmethod
     def maxlen() -> int:
-        return 14 # len(UNEXPECTEDPASS)
+        return 14  # len(UNEXPECTEDPASS)
 
     def is_ok(self) -> bool:
         return self in {TestResult.OK, TestResult.EXPECTEDFAIL}
@@ -267,7 +267,11 @@ class TestResult(enum.Enum):
         return str(self.colorize('>>> '))
 
 
-TYPE_TAPResult = T.Union['TAPParser.Test', 'TAPParser.Error', 'TAPParser.Version', 'TAPParser.Plan', 'TAPParser.Bailout']
+TYPE_TAPResult = T.Union['TAPParser.Test',
+                         'TAPParser.Error',
+                         'TAPParser.Version',
+                         'TAPParser.Plan',
+                         'TAPParser.Bailout']
 
 class TAPParser:
     class Plan(T.NamedTuple):
@@ -1396,7 +1400,7 @@ class SingleTestRunner:
         return self.runobj
 
     async def _run_subprocess(self, args: T.List[str], *,
-                              stdout: int, stderr: int,
+                              stdout: T.Optional[int], stderr: T.Optional[int],
                               env: T.Dict[str, str], cwd: T.Optional[str]) -> TestSubprocess:
         # Let gdb handle ^C instead of us
         if self.options.gdb:
@@ -1840,9 +1844,9 @@ class TestHarness:
     async def _run_tests(self, runners: T.List[SingleTestRunner]) -> None:
         semaphore = asyncio.Semaphore(self.options.num_processes)
         futures = deque()  # type: T.Deque[asyncio.Future]
-        running_tests = dict() # type: T.Dict[asyncio.Future, str]
+        running_tests = dict()  # type: T.Dict[asyncio.Future, str]
         interrupted = False
-        ctrlc_times = deque(maxlen=MAX_CTRLC) # type: T.Deque[float]
+        ctrlc_times = deque(maxlen=MAX_CTRLC)  # type: T.Deque[float]
 
         async def run_test(test: SingleTestRunner) -> None:
             async with semaphore: