fix windows tests

* different exit code on windows (not -9)
* `/bin/echo` obvs doesn't exist

distributed/tests/test_utils_test.py

@@ -862,15 +862,15 @@ def test_popen_timeout(capsys: pytest.CaptureFixture):
     # The contextmanager raises `TimeoutExpired` once the process is killed,
     # because it failed the 1s timeout
     captured = capsys.readouterr()
-    assert "stdout: returncode -9" in captured.out
+    assert "stdout: returncode" in captured.out
     assert "interrupted" in captured.out
     assert "slept" in captured.out
 
 
 def test_popen_always_prints_output(capsys: pytest.CaptureFixture):
     # We always print stdout even if there was no error, in case some other assertion
     # later in the test fails and the output would be useful.
-    with popen(["/bin/echo", "foo"], capture_output=True) as proc:
+    with popen([sys.executable, "-c", "print('foo')"], capture_output=True) as proc:
         proc.communicate(timeout=5)
 
     captured = capsys.readouterr()