# All files / helpers idb-manager.test.ts

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     /**
     * @license
     * Copyright 2019 Google Inc.
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     *   http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */

    import { expect } from 'chai';
    import { AppConfig } from '../interfaces/app-config';
    import { getFakeAppConfig } from '../testing/get-fake-app';
    import '../testing/setup';
    import { clear, get, remove, set, update } from './idb-manager';

    describe('idb manager', () => {
      let appConfig1: AppConfig;
      let appConfig2: AppConfig;

      beforeEach(() => {
        appConfig1 = { ...getFakeAppConfig(), appName: 'appName1' };
        appConfig2 = { ...getFakeAppConfig(), appName: 'appName2' };
      });

      describe('get / set', () => {
        it('sets a value and then gets the same value back', async () => {
          await set(appConfig1, 'value');
          const value = await get<string>(appConfig1);
          expect(value).to.equal('value');
        });

        it('gets undefined for a key that does not exist', async () => {
          const value = await get<string>(appConfig1);
          expect(value).to.be.undefined;
        });

        it('sets and gets multiple values with different keys', async () => {
          await set(appConfig1, 'value');
          await set(appConfig2, 'value2');
          expect(await get<string>(appConfig1)).to.equal('value');
          expect(await get<string>(appConfig2)).to.equal('value2');
        });

        it('overwrites a value', async () => {
          await set(appConfig1, 'value');
          await set(appConfig1, 'newValue');
          expect(await get<string>(appConfig1)).to.equal('newValue');
        });
      });

      describe('remove', () => {
        it('deletes a key', async () => {
          await set(appConfig1, 'value');
          await remove(appConfig1);
          expect(await get<string>(appConfig1)).to.be.undefined;
        });

        it('does not throw if key does not exist', async () => {
          await remove(appConfig1);
          expect(await get<string>(appConfig1)).to.be.undefined;
        });
      });

      describe('clear', () => {
        it('deletes all keys', async () => {
          await set(appConfig1, 'value');
          await set(appConfig2, 'value2');
          await clear();
          expect(await get(appConfig1)).to.be.undefined;
          expect(await get(appConfig2)).to.be.undefined;
        });
      });

      describe('update', () => {
        it('gets and sets a value atomically, returns the new value', async () => {
          let isGetCalled = false;

          await set(appConfig1, 'value');

          const resultPromise = update<string, string>(appConfig1, oldValue => {
            // get is already called for the same key, but it will only complete
            // after update transaction finishes, at which point it will return the
            // new value.
            expect(isGetCalled).to.be.true;

            expect(oldValue).to.equal('value');
            return 'newValue';
          });

          // Called immediately after update, but before update completed.
          const getPromise = get<string>(appConfig1);
          isGetCalled = true;

          // Update returns the new value
          expect(await resultPromise).to.equal('newValue');

          // If update weren't atomic, this would return the old value.
          expect(await getPromise).to.equal('newValue');
        });

        it('can change the type of the value', async () => {
          let isGetCalled = false;

          await set(appConfig1, 'value');

          const resultPromise = update<string, number>(appConfig1, oldValue => {
            // get is already called for the same key, but it will only complete
            // after update transaction finishes, at which point it will return the
            // new value.
            expect(isGetCalled).to.be.true;

            expect(oldValue).to.equal('value');
            return 123;
          });

          // Called immediately after update, but before update completed.
          const getPromise = get<number>(appConfig1);
          isGetCalled = true;

          // Update returns the new value
          expect(await resultPromise).to.equal(123);

          // If update weren't atomic, this would return the old value.
          expect(await getPromise).to.equal(123);
        });
      });
    });