html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,issue,performed_via_github_app
https://github.com/simonw/datasette/issues/1959#issuecomment-1353705072,https://api.github.com/repos/simonw/datasette/issues/1959,1353705072,IC_kwDOBm6k_c5Qr-Zw,9599,2022-12-15T21:04:07Z,2022-12-15T21:04:07Z,OWNER,I'm going to start by getting every test that uses the raw `(app_client)` fixture and nothing else (194 at the moment) to switch to `async def` using a shared Datasette instance and `datasette.client.get()`.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",1499081664,
https://github.com/simonw/datasette/issues/1959#issuecomment-1353707828,https://api.github.com/repos/simonw/datasette/issues/1959,1353707828,IC_kwDOBm6k_c5Qr_E0,9599,2022-12-15T21:06:29Z,2022-12-15T21:06:29Z,OWNER,"Previous, abandoned attempt at this work (for #1843):
```diff
diff --git a/datasette/app.py b/datasette/app.py
index 7e682498..cf35c3a2 100644
--- a/datasette/app.py
+++ b/datasette/app.py
@@ -228,7 +228,7 @@ class Datasette:
         template_dir=None,
         plugins_dir=None,
         static_mounts=None,
-        memory=False,
+        memory=None,
         settings=None,
         secret=None,
         version_note=None,
@@ -238,6 +238,7 @@ class Datasette:
         nolock=False,
     ):
         self._startup_invoked = False
+        self._extra_on_startup = []
         assert config_dir is None or isinstance(
             config_dir, Path
         ), ""config_dir= should be a pathlib.Path""
@@ -278,7 +279,7 @@ class Datasette:
                 raise
         self.crossdb = crossdb
         self.nolock = nolock
-        if memory or crossdb or not self.files:
+        if memory or crossdb or (not self.files and memory is not False):
             self.add_database(
                 Database(self, is_mutable=False, is_memory=True), name=""_memory""
             )
@@ -391,6 +392,9 @@ class Datasette:
         self._root_token = secrets.token_hex(32)
         self.client = DatasetteClient(self)
 
+    def _add_on_startup(self, fn):
+        self._extra_on_startup.append(fn)
+
     async def refresh_schemas(self):
         if self._refresh_schemas_lock.locked():
             return
@@ -431,6 +435,8 @@ class Datasette:
         # This must be called for Datasette to be in a usable state
         if self._startup_invoked:
             return
+        for fn in self._extra_on_startup:
+            await fn()
         # Register permissions, but watch out for duplicate name/abbr
         names = {}
         abbrs = {}
@@ -1431,9 +1437,9 @@ class Datasette:
         )
         if self.setting(""trace_debug""):
             asgi = AsgiTracer(asgi)
-        asgi = AsgiRunOnFirstRequest(asgi, on_startup=[setup_db, self.invoke_startup])
         for wrapper in pm.hook.asgi_wrapper(datasette=self):
             asgi = wrapper(asgi)
+        asgi = AsgiRunOnFirstRequest(asgi, on_startup=[setup_db, self.invoke_startup])
         return asgi
 
 
diff --git a/datasette/utils/asgi.py b/datasette/utils/asgi.py
index 56690251..986755cb 100644
--- a/datasette/utils/asgi.py
+++ b/datasette/utils/asgi.py
@@ -423,9 +423,9 @@ class AsgiFileDownload:
 
 
 class AsgiRunOnFirstRequest:
-    def __init__(self, asgi, on_startup):
+    def __init__(self, app, on_startup):
         assert isinstance(on_startup, list)
-        self.asgi = asgi
+        self.app = app
         self.on_startup = on_startup
         self._started = False
 
@@ -434,4 +434,4 @@ class AsgiRunOnFirstRequest:
             self._started = True
             for hook in self.on_startup:
                 await hook()
-        return await self.asgi(scope, receive, send)
+        return await self.app(scope, receive, send)
diff --git a/tests/conftest.py b/tests/conftest.py
index cd735e12..d1301943 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -23,6 +23,15 @@ UNDOCUMENTED_PERMISSIONS = {
 }
 
 
+# @pytest.fixture(autouse=True)
+# def log_name_of_test_before_test(request):
+#     # To help identify tests that are hanging
+#     name = str(request.node)
+#     with open(""/tmp/test.log"", ""a"") as f:
+#         f.write(name + ""\n"")
+#     yield
+
+
 def pytest_report_header(config):
     return ""SQLite: {}"".format(
         sqlite3.connect("":memory:"").execute(""select sqlite_version()"").fetchone()[0]
diff --git a/tests/fixtures.py b/tests/fixtures.py
index a6700239..18d3f1b7 100644
--- a/tests/fixtures.py
+++ b/tests/fixtures.py
@@ -101,6 +101,19 @@ EXPECTED_PLUGINS = [
 ]
 
 
+def _populate_connection(conn):
+    # Drop any tables and views that exist
+    to_drop = conn.execute(
+        ""SELECT name, type FROM sqlite_master where type in ('table', 'view')""
+    ).fetchall()
+    for name, type in to_drop:
+        conn.execute(f""DROP {type} IF EXISTS [{name}]"")
+    conn.executescript(TABLES)
+    for sql, params in TABLE_PARAMETERIZED_SQL:
+        with conn:
+            conn.execute(sql, params)
+
+
 @contextlib.contextmanager
 def make_app_client(
     sql_time_limit_ms=None,
@@ -117,45 +130,22 @@ def make_app_client(
     metadata=None,
     crossdb=False,
 ):
-    with tempfile.TemporaryDirectory() as tmpdir:
-        filepath = os.path.join(tmpdir, filename)
-        if is_immutable:
-            files = []
-            immutables = [filepath]
-        else:
-            files = [filepath]
-            immutables = []
-        conn = sqlite3.connect(filepath)
-        conn.executescript(TABLES)
-        for sql, params in TABLE_PARAMETERIZED_SQL:
-            with conn:
-                conn.execute(sql, params)
-        # Close the connection to avoid ""too many open files"" errors
-        conn.close()
-        if extra_databases is not None:
-            for extra_filename, extra_sql in extra_databases.items():
-                extra_filepath = os.path.join(tmpdir, extra_filename)
-                c2 = sqlite3.connect(extra_filepath)
-                c2.executescript(extra_sql)
-                c2.close()
-                # Insert at start to help test /-/databases ordering:
-                files.insert(0, extra_filepath)
-        os.chdir(os.path.dirname(filepath))
-        settings = settings or {}
-        for key, value in {
-            ""default_page_size"": 50,
-            ""max_returned_rows"": max_returned_rows or 100,
-            ""sql_time_limit_ms"": sql_time_limit_ms or 200,
-            # Default is 3 but this results in ""too many open files""
-            # errors when running the full test suite:
-            ""num_sql_threads"": 1,
-        }.items():
-            if key not in settings:
-                settings[key] = value
+    settings = settings or {}
+    for key, value in {
+        ""default_page_size"": 50,
+        ""max_returned_rows"": max_returned_rows or 100,
+        ""sql_time_limit_ms"": sql_time_limit_ms or 200,
+        # Default is 3 but this results in ""too many open files""
+        # errors when running the full test suite:
+        ""num_sql_threads"": 1,
+    }.items():
+        if key not in settings:
+            settings[key] = value
+    # We can use an in-memory database, but only if we're not doing anything
+    # with is_immutable or extra_databases and filename is the default
+    if not is_immutable and not extra_databases and filename == ""fixtures.db"":
         ds = Datasette(
-            files,
-            immutables=immutables,
-            memory=memory,
+            memory=memory or False,
             cors=cors,
             metadata=metadata or METADATA,
             plugins_dir=PLUGINS_DIR,
@@ -165,12 +155,57 @@ def make_app_client(
             template_dir=template_dir,
             crossdb=crossdb,
         )
+        db = ds.add_memory_database(""fixtures"")
+
+        async def populate_fixtures():
+            print(""Here we go... populating fixtures"")
+            await db.execute_write_fn(_populate_connection)
+
+        ds._add_on_startup(populate_fixtures)
         yield TestClient(ds)
-        # Close as many database connections as possible
-        # to try and avoid too many open files error
-        for db in ds.databases.values():
-            if not db.is_memory:
-                db.close()
+    else:
+        with tempfile.TemporaryDirectory() as tmpdir:
+            filepath = os.path.join(tmpdir, filename)
+            if is_immutable:
+                files = []
+                immutables = [filepath]
+            else:
+                files = [filepath]
+                immutables = []
+
+            conn = sqlite3.connect(filepath)
+            _populate_connection(conn)
+            # Close the connection to reduce ""too many open files"" errors
+            conn.close()
+
+            if extra_databases is not None:
+                for extra_filename, extra_sql in extra_databases.items():
+                    extra_filepath = os.path.join(tmpdir, extra_filename)
+                    c2 = sqlite3.connect(extra_filepath)
+                    c2.executescript(extra_sql)
+                    c2.close()
+                    # Insert at start to help test /-/databases ordering:
+                    files.insert(0, extra_filepath)
+            os.chdir(os.path.dirname(filepath))
+            ds = Datasette(
+                files,
+                immutables=immutables,
+                memory=memory,
+                cors=cors,
+                metadata=metadata or METADATA,
+                plugins_dir=PLUGINS_DIR,
+                settings=settings,
+                inspect_data=inspect_data,
+                static_mounts=static_mounts,
+                template_dir=template_dir,
+                crossdb=crossdb,
+            )
+            yield TestClient(ds)
+            # Close as many database connections as possible
+            # to try and avoid too many open files error
+            for db in ds.databases.values():
+                if not db.is_memory:
+                    db.close()
 
 
 @pytest.fixture(scope=""session"")
diff --git a/tests/test_cli.py b/tests/test_cli.py
index d3e015fa..d9e4e457 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -1,5 +1,6 @@
 from .fixtures import (
     app_client,
+    app_client_with_cors,
     make_app_client,
     TestClient as _TestClient,
     EXPECTED_PLUGINS,
@@ -38,7 +39,7 @@ def test_inspect_cli(app_client):
         assert expected_count == database[""tables""][table_name][""count""]
 
 
-def test_inspect_cli_writes_to_file(app_client):
+def test_inspect_cli_writes_to_file(app_client_with_cors):
     runner = CliRunner()
     result = runner.invoke(
         cli, [""inspect"", ""fixtures.db"", ""--inspect-file"", ""foo.json""]
```","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",1499081664,
https://github.com/simonw/datasette/issues/1959#issuecomment-1353720559,https://api.github.com/repos/simonw/datasette/issues/1959,1353720559,IC_kwDOBm6k_c5QsCLv,9599,2022-12-15T21:19:56Z,2022-12-15T21:19:56Z,OWNER,"Here's a port of the first `def ...(app_client)` test. Note that the TestClient object works slightly differently from the HTTPX response returned by `await datasette.client.get(...)`:

```diff
diff --git a/datasette/app.py b/datasette/app.py
index f3cb8876..b770b469 100644
--- a/datasette/app.py
+++ b/datasette/app.py
@@ -281,7 +281,7 @@ class Datasette:
                 raise
         self.crossdb = crossdb
         self.nolock = nolock
-        if memory or crossdb or not self.files:
+        if memory or crossdb or (not self.files and memory is not False):
             self.add_database(
                 Database(self, is_mutable=False, is_memory=True), name=""_memory""
             )
diff --git a/pytest.ini b/pytest.ini
index 559e518c..0bcb0d1e 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -8,4 +8,5 @@ filterwarnings=
     ignore:.*current_task.*:PendingDeprecationWarning
 markers =
     serial: tests to avoid using with pytest-xdist
+    ds_client: tests using the ds_client fixture
 asyncio_mode = strict
diff --git a/tests/conftest.py b/tests/conftest.py
index cd735e12..648423ba 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -2,6 +2,7 @@ import httpx
 import os
 import pathlib
 import pytest
+import pytest_asyncio
 import re
 import subprocess
 import tempfile
@@ -23,6 +24,22 @@ UNDOCUMENTED_PERMISSIONS = {
 }
 
 
+@pytest_asyncio.fixture
+async def ds_client():
+    from datasette.app import Datasette
+    from .fixtures import METADATA, PLUGINS_DIR
+    ds = Datasette(memory=False, metadata=METADATA, plugins_dir=PLUGINS_DIR)
+    from .fixtures import TABLES, TABLE_PARAMETERIZED_SQL
+    db = ds.add_memory_database(""fixtures"")
+    def prepare(conn):
+        conn.executescript(TABLES)
+        for sql, params in TABLE_PARAMETERIZED_SQL:
+            with conn:
+                conn.execute(sql, params)
+    await db.execute_write_fn(prepare)
+    return ds.client
+
+
 def pytest_report_header(config):
     return ""SQLite: {}"".format(
         sqlite3.connect("":memory:"").execute(""select sqlite_version()"").fetchone()[0]
diff --git a/tests/test_api.py b/tests/test_api.py
index 5f2a6ea6..ddf4219c 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -23,12 +23,15 @@ import sys
 import urllib
 
 
-def test_homepage(app_client):
-    response = app_client.get(""/.json"")
-    assert response.status == 200
+@pytest.mark.ds_client
+@pytest.mark.asyncio
+async def test_homepage(ds_client):
+    response = await ds_client.get(""/.json"")
+    assert response.status_code == 200
     assert ""application/json; charset=utf-8"" == response.headers[""content-type""]
-    assert response.json.keys() == {""fixtures"": 0}.keys()
-    d = response.json[""fixtures""]
+    data = response.json()
+    assert data.keys() == {""fixtures"": 0}.keys()
+    d = data[""fixtures""]
     assert d[""name""] == ""fixtures""
     assert d[""tables_count""] == 24
     assert len(d[""tables_and_views_truncated""]) == 5
@@ -36,7 +39,7 @@ def test_homepage(app_client):
     # 4 hidden FTS tables + no_primary_key (hidden in metadata)
     assert d[""hidden_tables_count""] == 6
     # 201 in no_primary_key, plus 6 in other hidden tables:
-    assert d[""hidden_table_rows_sum""] == 207, response.json
+    assert d[""hidden_table_rows_sum""] == 207, data
     assert d[""views_count""] == 4
```","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",1499081664,
https://github.com/simonw/datasette/issues/1959#issuecomment-1353721091,https://api.github.com/repos/simonw/datasette/issues/1959,1353721091,IC_kwDOBm6k_c5QsCUD,9599,2022-12-15T21:20:32Z,2022-12-15T21:20:32Z,OWNER,Rather than tediously rewriting every single test to the new shape I'm going to try a wrapper for that HTTPX response that transforms it into an imitation of the one returned by the existing `TestClient` class.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",1499081664,
https://github.com/simonw/datasette/issues/1959#issuecomment-1353728682,https://api.github.com/repos/simonw/datasette/issues/1959,1353728682,IC_kwDOBm6k_c5QsEKq,9599,2022-12-15T21:28:35Z,2022-12-15T21:28:35Z,OWNER,"Got this error trying to have two tests use the same `ds_client` async fixture when I added `scope=""session""` to that fixture:

- https://github.com/tortoise/tortoise-orm/issues/638

Adding this to `conftest.py` (as suggested in that issue thread) seemed to fix it:

```python
@pytest.fixture(scope=""session"")
def event_loop():
    return asyncio.get_event_loop()
```","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",1499081664,
https://github.com/simonw/datasette/issues/1959#issuecomment-1353738075,https://api.github.com/repos/simonw/datasette/issues/1959,1353738075,IC_kwDOBm6k_c5QsGdb,9599,2022-12-15T21:35:56Z,2022-12-15T21:35:56Z,OWNER,"I built that `OldResponse` class:
```diff
diff --git a/tests/utils.py b/tests/utils.py
index 191ead9b..f39ac434 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -30,3 +30,25 @@ def inner_html(soup):
 def has_load_extension():
     conn = sqlite3.connect("":memory:"")
     return hasattr(conn, ""enable_load_extension"")
+
+
+class OldResponse:
+    ""Transform an HTTPX response to simulate the older TestClient responses""
+    # https://github.com/simonw/datasette/issues/1959#issuecomment-1353721091
+    def __init__(self, response):
+        self.response = response
+        self._json = None
+
+    @property
+    def headers(self):
+        return self.response.headers
+
+    @property
+    def status(self):
+        return self.response.status_code
+
+    @property
+    def json(self):
+        if self._json is None:
+            self._json = self.response.json()
+        return self._json
```
I can use it in tests like this:
```python
@pytest.mark.asyncio
async def test_homepage(ds_client):
    response = OldResponse(await ds_client.get(""/.json""))
    assert response.status == 200
    assert ""application/json; charset=utf-8"" == response.headers[""content-type""]
    assert response.json.keys() == {""fixtures"": 0}.keys()
    d = response.json[""fixtures""]
    assert d[""name""] == ""fixtures""
    assert d[""tables_count""] == 24
    assert len(d[""tables_and_views_truncated""]) == 5
    assert d[""tables_and_views_more""] is True
    # 4 hidden FTS tables + no_primary_key (hidden in metadata)
    assert d[""hidden_tables_count""] == 6
    # 201 in no_primary_key, plus 6 in other hidden tables:
    assert d[""hidden_table_rows_sum""] == 207, response.json
    assert d[""views_count""] == 4
```
But as I work through the tests I'm finding it's actually not too hard to port them over, so I likely won't use it after all.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",1499081664,
https://github.com/simonw/datasette/issues/1959#issuecomment-1353747370,https://api.github.com/repos/simonw/datasette/issues/1959,1353747370,IC_kwDOBm6k_c5QsIuq,9599,2022-12-15T21:45:14Z,2022-12-15T21:45:14Z,OWNER,I'm going to do this in a PR.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",1499081664,
https://github.com/simonw/datasette/issues/1959#issuecomment-1355317782,https://api.github.com/repos/simonw/datasette/issues/1959,1355317782,IC_kwDOBm6k_c5QyIIW,9599,2022-12-16T17:57:25Z,2022-12-16T17:57:25Z,OWNER,"Opened a follow-up issue here:
- #1962","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",1499081664,
https://github.com/simonw/datasette/issues/1959#issuecomment-1356478792,https://api.github.com/repos/simonw/datasette/issues/1959,1356478792,IC_kwDOBm6k_c5Q2jlI,9599,2022-12-17T21:49:36Z,2022-12-17T21:49:36Z,OWNER,"Made a really good start on this in the just-merged PR:
- #1960

The follow-up work will happen in:
- #1962","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",1499081664,