Add MMKV interface (#5169)

src/storage/__tests__/index.test.ts

@@ -0,0 +1,81 @@
+import {beforeEach, expect, jest, test} from '@jest/globals'
+
+import {Storage} from '#/storage'
+
+jest.mock('react-native-mmkv', () => ({
+  MMKV: class MMKVMock {
+    _store = new Map()
+
+    set(key: string, value: unknown) {
+      this._store.set(key, value)
+    }
+
+    getString(key: string) {
+      return this._store.get(key)
+    }
+
+    delete(key: string) {
+      return this._store.delete(key)
+    }
+  },
+}))
+
+type Schema = {
+  boo: boolean
+  str: string | null
+  num: number
+  obj: Record<string, unknown>
+}
+
+const scope = `account`
+const store = new Storage<['account'], Schema>({id: 'test'})
+
+beforeEach(() => {
+  store.removeMany([scope], ['boo', 'str', 'num', 'obj'])
+})
+
+test(`stores and retrieves data`, () => {
+  store.set([scope, 'boo'], true)
+  store.set([scope, 'str'], 'string')
+  store.set([scope, 'num'], 1)
+  expect(store.get([scope, 'boo'])).toEqual(true)
+  expect(store.get([scope, 'str'])).toEqual('string')
+  expect(store.get([scope, 'num'])).toEqual(1)
+})
+
+test(`removes data`, () => {
+  store.set([scope, 'boo'], true)
+  expect(store.get([scope, 'boo'])).toEqual(true)
+  store.remove([scope, 'boo'])
+  expect(store.get([scope, 'boo'])).toEqual(undefined)
+})
+
+test(`removes multiple keys at once`, () => {
+  store.set([scope, 'boo'], true)
+  store.set([scope, 'str'], 'string')
+  store.set([scope, 'num'], 1)
+  store.removeMany([scope], ['boo', 'str', 'num'])
+  expect(store.get([scope, 'boo'])).toEqual(undefined)
+  expect(store.get([scope, 'str'])).toEqual(undefined)
+  expect(store.get([scope, 'num'])).toEqual(undefined)
+})
+
+test(`concatenates keys`, () => {
+  store.remove([scope, 'str'])
+  store.set([scope, 'str'], 'concat')
+  // @ts-ignore accessing these properties for testing purposes only
+  expect(store.store.getString(`${scope}${store.sep}str`)).toBeTruthy()
+})
+
+test(`can store falsy values`, () => {
+  store.set([scope, 'str'], null)
+  store.set([scope, 'num'], 0)
+  expect(store.get([scope, 'str'])).toEqual(null)
+  expect(store.get([scope, 'num'])).toEqual(0)
+})
+
+test(`can store objects`, () => {
+  const obj = {foo: true}
+  store.set([scope, 'obj'], obj)
+  expect(store.get([scope, 'obj'])).toEqual(obj)
+})