Additional tests for WAL mode

This should have been included in 2d2d724e32

Refs #132

tests/test_wal.py

@@ -0,0 +1,24 @@
+import pytest
+from sqlite_utils import Database
+import sqlite3
+
+
+@pytest.fixture
+def db_path_tmpdir(tmpdir):
+    path = tmpdir / "test.db"
+    db = Database(str(path))
+    return db, path, tmpdir
+
+
+def test_enable_disable_wal(db_path_tmpdir):
+    db, path, tmpdir = db_path_tmpdir
+    assert len(tmpdir.listdir()) == 1
+    assert "delete" == db.journal_mode
+    assert "test.db-wal" not in [f.basename for f in tmpdir.listdir()]
+    db.enable_wal()
+    assert "wal" == db.journal_mode
+    db["test"].insert({"foo": "bar"})
+    assert "test.db-wal" in [f.basename for f in tmpdir.listdir()]
+    db.disable_wal()
+    assert "delete" == db.journal_mode
+    assert "test.db-wal" not in [f.basename for f in tmpdir.listdir()]