Add tests for pypi tasks

swh/lister/pypi/tests/conftest.py

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+from swh.lister.core.tests.conftest import *  # noqa

swh/lister/pypi/tests/test_tasks.py

@@ -0,0 +1,27 @@
+from unittest.mock import patch
+
+
+def test_ping(swh_app, celery_session_worker):
+    res = swh_app.send_task(
+        'swh.lister.pypi.tasks.ping')
+    assert res
+    res.wait()
+    assert res.successful()
+    assert res.result == 'OK'
+
+
+@patch('swh.lister.pypi.tasks.PyPILister')
+def test_lister(lister, swh_app, celery_session_worker):
+    # setup the mocked PypiLister
+    lister.return_value = lister
+    lister.run.return_value = None
+
+    res = swh_app.send_task(
+        'swh.lister.pypi.tasks.PyPIListerTask')
+    assert res
+    res.wait()
+    assert res.successful()
+
+    lister.assert_called_once_with()
+    lister.db_last_index.assert_not_called()
+    lister.run.assert_called_once_with()