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diff --git a/web/database/queries/storage-engine-queries.test.js b/web/database/queries/storage-engine-queries.test.js
new file mode 100644
--- /dev/null
+++ b/web/database/queries/storage-engine-queries.test.js
@@ -0,0 +1,74 @@
+// @flow
+
+import initSqlJs from 'sql.js';
+
+import { setupSQLiteDB } from './db-queries.js';
+import {
+ getPersistStorageItem,
+ removePersistStorageItem,
+ setPersistStorageItem,
+} from './storage-engine-queries.js';
+
+const TEST_KEY = 'redux-persist';
+const TEST_ITEM = '[[{}]]';
+
+describe('redux-persist storage engine queries', () => {
+ let db;
+
+ beforeAll(async () => {
+ const SQL = await initSqlJs();
+ db = new SQL.Database();
+ });
+
+ beforeEach(() => {
+ setupSQLiteDB(db);
+ const query = `
+ INSERT INTO persist_storage (key, item)
+ VALUES ($key, $item)
+ `;
+ const values = {
+ $key: TEST_KEY,
+ $item: TEST_ITEM,
+ };
+ db.exec(query, values);
+ });
+
+ afterEach(() => {
+ db.exec(`DELETE FROM persist_storage`);
+ });
+
+ it('should return the item of an existing key', () => {
+ expect(getPersistStorageItem(db, TEST_KEY)).toBe(TEST_ITEM);
+ });
+
+ it('should return empty string for a non-existing key', () => {
+ const nonExistingKey = 'non_existing_key';
+ expect(getPersistStorageItem(db, nonExistingKey)).toBe('');
+ });
+
+ it('should set the item of an existing key', () => {
+ const newItem = '[[{a:2]]';
+ setPersistStorageItem(db, TEST_KEY, newItem);
+ expect(getPersistStorageItem(db, TEST_KEY)).toBe(newItem);
+ });
+
+ it('should set the item of a non-existing key', () => {
+ const newEntry = 'testEntry';
+ const newData = 'testData';
+ setPersistStorageItem(db, newEntry, newData);
+ expect(getPersistStorageItem(db, newEntry)).toBe(newData);
+ expect(getPersistStorageItem(db, TEST_KEY)).toBe(TEST_ITEM);
+ });
+
+ it('should remove an existing key', () => {
+ removePersistStorageItem(db, TEST_KEY);
+ expect(getPersistStorageItem(db, TEST_KEY)).toBe('');
+ });
+
+ it('should do nothing when removing a non-existing key', () => {
+ const nonExistingName = 'non_existing_name';
+ removePersistStorageItem(db, nonExistingName);
+ expect(getPersistStorageItem(db, nonExistingName)).toBe('');
+ expect(getPersistStorageItem(db, TEST_KEY)).toBe(TEST_ITEM);
+ });
+});

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