New "startup" plugin hook, closes #834

tests/fixtures.py

@@ -49,6 +49,7 @@ EXPECTED_PLUGINS = [
             "register_facet_classes",
             "register_routes",
             "render_cell",
+            "startup",
         ],
     },
     {

tests/plugins/my_plugin.py

@@ -167,3 +167,8 @@ def register_routes():
         (r"/two/(?P<name>.*)$", two),
         (r"/three/$", three),
     ]
+
+
+@hookimpl
+def startup(datasette):
+    datasette._startup_hook_fired = True

tests/test_cli.py

@@ -10,6 +10,7 @@ from click.testing import CliRunner
 import io
 import json
 import pathlib
+import pytest
 import textwrap
 
 

tests/test_plugins.py

@@ -572,3 +572,9 @@ def test_register_routes_asgi(app_client):
     response = app_client.get("/three/")
     assert {"hello": "world"} == response.json
     assert "1" == response.headers["x-three"]
+
+
+@pytest.mark.asyncio
+async def test_startup(app_client):
+    await app_client.ds.invoke_startup()
+    assert app_client.ds._startup_hook_fired