tests: Don't wait for testprocess if it quits.

tests/integration/test_testprocess.py

@@ -90,6 +90,18 @@ class QuitPythonProcess(PythonProcess):
         return (sys.executable, ['-c', ';'.join(code)])
 
 
+class NoReadyPythonProcess(PythonProcess):
+
+    """A testprocess which never emits 'ready' and quits."""
+
+    def _executable_args(self):
+        code = [
+            'import sys',
+            'sys.exit(0)',
+        ]
+        return (sys.executable, ['-c', ';'.join(code)])
+
+
 @pytest.yield_fixture
 def pyproc():
     proc = PythonProcess()
@@ -104,6 +116,20 @@ def quit_pyproc():
     proc.terminate()
 
 
+@pytest.yield_fixture
+def noready_pyproc():
+    proc = NoReadyPythonProcess()
+    yield proc
+    proc.terminate()
+
+
+def test_no_ready_python_process(noready_pyproc):
+    """When a process quits immediately, waiting for start should interrupt."""
+    with pytest.raises(testprocess.ProcessExited):
+        with stopwatch(max_ms=5000):
+            noready_pyproc.start()
+
+
 def test_quitting_process(qtbot, quit_pyproc):
     with qtbot.waitSignal(quit_pyproc.proc.finished):
         quit_pyproc.start()

tests/integration/testprocess.py

@@ -215,8 +215,21 @@ class Process(QObject):
 
     def start(self, args=None, *, env=None):
         """Start the process and wait until it started."""
-        with self._wait_signal(self.ready, timeout=60000):
+        self._start(args, env=env)
-            self._start(args, env=env)
+        for _ in range(30):
+            with self._wait_signal(self.ready, timeout=1000,
+                                   raising=False) as blocker:
+                pass
+
+            if not self.is_running():
+                # _start ensures it actually started, but it might quit shortly
+                # afterwards
+                raise ProcessExited()
+
+            if blocker.signal_triggered:
+                return
+
+        raise WaitForTimeout("Timed out while waiting for process start.")
 
     def _start(self, args, env):
         """Actually start the process."""