diff --git a/tests/processes/__init__.py b/tests/processes/__init__.py
index 0b847ace4..5882a9ef1 100644
--- a/tests/processes/__init__.py
+++ b/tests/processes/__init__.py
@@ -99,3 +99,38 @@ def bbox(request, response):
         area = request.inputs['area'][0].data
         response.outputs['extent'].data = area
         return response
+
+
+class Sleep(Process):
+    """A long running process, just sleeping."""
+    def __init__(self):
+        inputs = [
+            LiteralInput('seconds', title='Seconds', data_type='float')
+        ]
+        outputs = [
+            LiteralOutput('finished', title='Finished', data_type='boolean')
+        ]
+
+        super(Sleep, self).__init__(
+            self._handler,
+            identifier='sleep',
+            title='Sleep',
+            abstract='Wait for specified number of seconds.',
+            inputs=inputs,
+            outputs=outputs,
+            store_supported=True,
+            status_supported=True
+        )
+
+    @staticmethod
+    def _handler(request, response):
+        import time
+
+        seconds = request.inputs['seconds'][0].data
+        step = seconds / 3
+        for i in range(3):
+            response.update_status('Sleep in progress...', i / 3 * 100)
+            time.sleep(step)
+
+        response.outputs['finished'].data = "True"
+        return response
diff --git a/tests/test_assync.py b/tests/test_assync.py
index 2db2eb074..f64a53b79 100644
--- a/tests/test_assync.py
+++ b/tests/test_assync.py
@@ -4,67 +4,67 @@
 ##################################################################
 
 import unittest
+import pytest
 import time
-from pywps import Service, Process, LiteralInput, LiteralOutput
+from pywps import Service, configuration
 from pywps import get_ElementMakerForVersion
-from pywps.tests import client_for, assert_response_accepted
+from pywps.tests import client_for, assert_response_accepted, assert_response_success
+from .processes import Sleep
+from owslib.wps import WPSExecution
+from pathlib import Path
 
 VERSION = "1.0.0"
 
 WPS, OWS = get_ElementMakerForVersion(VERSION)
 
 
-def create_sleep():
+class ExecuteTest(unittest.TestCase):
+    def setUp(self) -> None:
+        # Running processes using the MultiProcessing scheduler and a file-based database
+        configuration.CONFIG.set('processing', 'mode', 'distributed')
+        configuration.CONFIG.set("logging", "database", "sqlite:////tmp/test-pywps-logs.sqlite3")
 
-    def sleep(request, response):
-        seconds = request.inputs['seconds'][0].data
-        assert isinstance(seconds, float)
+    def tearDown(self) -> None:
+        configuration.load_configuration()
 
-        step = seconds / 3
-        for i in range(3):
-            # How is status working in version 4 ?
-            #self.status.set("Waiting...", i * 10)
-            time.sleep(step)
+    def test_async(self):
+        client = client_for(Service(processes=[Sleep()]))
+        wps = WPSExecution()
 
-        response.outputs['finished'].data = "True"
-        return response
+        # Build an asynchronous request (requires specifying outputs and setting the mode).
+        doc = wps.buildRequest('sleep',
+                               inputs=[('seconds', '.01')],
+                               output=[('finished', None, None)],
+                               mode='async')
 
-    return Process(handler=sleep,
-                   identifier='sleep',
-                   title='Sleep',
-                   inputs=[
-                       LiteralInput('seconds', title='Seconds', data_type='float')
-                   ],
-                   outputs=[
-                       LiteralOutput('finished', title='Finished', data_type='boolean')
-                   ]
-    )
+        resp = client.post_xml(doc=doc)
+        wps.parseResponse(resp.xml)
+        assert_response_accepted(resp)
 
+        # The process should not have finished by now. If it does, it's running in sync mode.
+        with pytest.raises(AssertionError):
+            assert_response_success(resp)
 
-class ExecuteTest(unittest.TestCase):
+        # Parse response to extract the status file path
+        url = resp.xml.xpath("//@statusLocation")[0]
 
-    def test_assync(self):
-        client = client_for(Service(processes=[create_sleep()]))
-        request_doc = WPS.Execute(
-            OWS.Identifier('sleep'),
-            WPS.DataInputs(
-                WPS.Input(
-                    OWS.Identifier('seconds'),
-                    WPS.Data(
-                        WPS.LiteralData(
-                            "0.3"
-                        )
-                    )
-                )
-            ),
-            version="1.0.0"
-        )
-        resp = client.post_xml(doc=request_doc)
-        assert_response_accepted(resp)
+        # OWSlib only reads from URLs, not local files. So we need to read the response manually.
+        p = Path(url[6:])
+
+        # Poll the process until it completes
+        total_time = 0
+        sleep_time = .01
+        while wps.status not in ["ProcessSucceeded", "ProcessFailed"]:
+            resp = p.read_bytes()
+            if resp:
+                wps.checkStatus(response=resp, sleepSecs=0.01)
+            else:
+                time.sleep(sleep_time)
+                total_time += sleep_time
+            if total_time > 1:
+                raise TimeoutError
 
-        # TODO:
-        # . extract the status URL from the response
-        # . send a status request
+        assert wps.status == 'ProcessSucceeded'
 
 
 def load_tests(loader=None, tests=None, pattern=None):