add failing test of DB issue

packages/swing-store/test/test-deletion.js

@@ -0,0 +1,50 @@
+// @ts-check
+import test from 'ava';
+import '@endo/init/debug.js';
+import fs from 'fs';
+import { initSwingStore } from '../src/swingStore.js';
+
+async function dosnap(filePath) {
+  fs.writeFileSync(filePath, 'abc');
+}
+
+test.failing('delete snapshots with export callback', async t => {
+  const exportLog = [];
+  const exportCallback = exports => {
+    for (const [key, value] of exports) {
+      exportLog.push([key, value]);
+    }
+  };
+  const store = initSwingStore(null, { exportCallback });
+  const { kernelStorage, hostStorage } = store;
+  const { snapStore } = kernelStorage;
+  const { commit } = hostStorage;
+
+  await snapStore.saveSnapshot('v1', 10, dosnap);
+  await snapStore.saveSnapshot('v1', 11, dosnap);
+  await snapStore.saveSnapshot('v1', 12, dosnap);
+  // nothing is written to exportCallback until endCrank() or commit()
+  t.deepEqual(exportLog, []);
+
+  commit();
+
+  t.is(exportLog.length, 4);
+  t.is(exportLog[0][0], 'snapshot.v1.10');
+  t.is(exportLog[1][0], 'snapshot.v1.11');
+  t.is(exportLog[2][0], 'snapshot.v1.12');
+  t.is(exportLog[3][0], 'snapshot.v1.current');
+  exportLog.length = 0;
+
+  // in a previous version, deleteVatSnapshots caused overlapping SQL
+  // queries, and failed
+  snapStore.deleteVatSnapshots('v1');
+  commit();
+
+  t.deepEqual(exportLog, [
+    ['snapshot.v1.10', null],
+    ['snapshot.v1.11', null],
+    ['snapshot.v1.12', null],
+    ['snapshot.v1.current', null],
+  ]);
+  exportLog.length = 0;
+});