Retry crashed tests

src/tests/conftest.py

@@ -0,0 +1,28 @@
+import pytest
+from xdist.dsession import DSession
+
+
+@pytest.mark.trylast
+def pytest_configure(config):
+    """
+    Somehow, somewhere, our test suite causes a segfault in SQLite, but only when run
+    on Travis CI in full. Therefore, we monkeypatch pytest-xdist to retry segfaulted
+    tests and keep fingers crossed that this doesn't turn into an infinite loop.
+    """
+
+    def _handle_crashitem(self, nodeid, worker):
+        runner = self.config.pluginmanager.getplugin("runner")
+        fspath = nodeid.split("::")[0]
+        msg = "Worker %r crashed while running %r" % (worker.gateway.id, nodeid)
+        rep = runner.TestReport(
+            nodeid, (fspath, None, fspath), (), "failed", msg, "???"
+        )
+        rep.node = worker
+        self.config.hook.pytest_runtest_logreport(report=rep)
+
+        # Schedule retry
+        self.sched.pending.append(self.sched.collection.index(nodeid))
+        for node in self.sched.node2pending:
+            self.sched.check_schedule(node)
+
+    DSession.handle_crashitem = _handle_crashitem