[twisted/internet/_glibbase] Fix Typeerror in simulate for py3

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src/twisted/internet/_glibbase.py

@@ -354,8 +354,8 @@ def simulate(self):
         if self._simtag is not None:
             self._source_remove(self._simtag)
         self.iterate()
-        timeout = min(self.timeout(), 0.01)
-        if timeout is None:
+        timeout = self.timeout()
+        if timeout is None or timeout > 0.01:
             timeout = 0.01
         self._simtag = self._timeout_add(
             int(timeout * 1000),

src/twisted/internet/test/test_glibbase.py

@@ -65,3 +65,34 @@ def test_ensureFailsWhenImported(self):
         )
         self.assertEqual(modules, {"m2": module})
         self.assertEqual(e.args, ("A message.",))
+
+
+class GlibReactorBaseTests(TestCase):
+    def test_simulate(self):
+        """ """
+        try:
+            from gi.repository import Gio  # type: ignore[import]
+
+            from twisted.internet import gireactor as _gireactor
+        except ImportError:
+            gireactor = None
+            gtk3reactor = None
+        else:
+            gireactor = _gireactor
+            # gtk3reactor may be unavailable even if gireactor is available; in
+            # particular in pygobject 3.4/gtk 3.6, when no X11 DISPLAY is found.
+            try:
+                from twisted.internet import gtk3reactor as _gtk3reactor
+            except ImportError:
+                gtk3reactor = None
+            else:
+                gtk3reactor = _gtk3reactor
+
+        from twisted.trial.unittest import SkipTest
+
+        # Skip all tests if gi is unavailable:
+        if gireactor is None and gtk3reactor is None:
+            raise SkipTest("gtk3/gi not importable")
+
+        gireactor.install()
+        gireactor.simulate()

src/twisted/newsfragments/9660.bugfix

@@ -0,0 +1 @@
+twisted.internet.glibbase.simulate no longer raises TypeError with no timeout on Python 3.