test: skip tests on py 3.11.0a4 that are failing in metacov

This specific set of circumstances was triggering
https://bugs.python.org/issue44088

Author: nedbat

coverage/sqldata.py

@@ -497,6 +497,9 @@ def add_arcs(self, arc_data):
             self._set_context_id()
             for filename, arcs in arc_data.items():
                 file_id = self._file_id(filename, add=True)
+                from coverage import env
+                if env.PYVERSION == (3, 11, 0, "alpha", 4, 0):
+                    arcs = [(a, b) for a, b in arcs if a is not None and b is not None]
                 data = [(file_id, self._current_context_id, fromno, tono) for fromno, tono in arcs]
                 con.executemany(
                     "insert or ignore into arc " +

tests/test_arcs.py

@@ -1234,7 +1234,7 @@ def run():
             arcz=".1 14 45 54 4.  .2 2.  -22 2-2",
         )
 
-    @pytest.mark.xfail(
+    @pytest.mark.skipif(
         ((3, 11, 0, "alpha", 4, 0) == env.PYVERSION) and not env.C_TRACER,
         reason="avoid a 3.11 bug: https://bugs.python.org/issue46389",
     )
@@ -1623,7 +1623,7 @@ def test_pathologically_long_code_object(self, n):
         self.check_coverage(code, arcs=[(-1, 1), (1, 2*n+4), (2*n+4, -1)])
         assert self.stdout() == f"{n}\n"
 
-    @pytest.mark.xfail(
+    @pytest.mark.skipif(
         ((3, 11, 0, "alpha", 4, 0) == env.PYVERSION) and not env.C_TRACER,
         reason="avoid a 3.11 bug: https://bugs.python.org/issue46389",
     )

tests/test_concurrency.py

@@ -496,6 +496,11 @@ def try_multiprocessing_code(
             last_line = self.squeezed_lines(out)[-1]
             assert re.search(r"TOTAL \d+ 0 100%", last_line)
 
+    @pytest.mark.skipif(
+        ((3, 11, 0, "alpha", 4, 0) == env.PYVERSION),
+        #((3, 11, 0, "alpha", 4, 0) == env.PYVERSION) and not env.C_TRACER and env.METACOV,
+        reason="avoid a 3.11 bug: https://bugs.python.org/issue46389",
+    )
     def test_multiprocessing_simple(self, start_method):
         nprocs = 3
         upto = 30
@@ -510,6 +515,11 @@ def test_multiprocessing_simple(self, start_method):
             start_method=start_method,
         )
 
+    @pytest.mark.skipif(
+        ((3, 11, 0, "alpha", 4, 0) == env.PYVERSION),
+        #((3, 11, 0, "alpha", 4, 0) == env.PYVERSION) and not env.C_TRACER and env.METACOV,
+        reason="avoid a 3.11 bug: https://bugs.python.org/issue46389",
+    )
     def test_multiprocessing_append(self, start_method):
         nprocs = 3
         upto = 30