Add jest and basic test structure

.vscode/launch.json

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+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "node",
+            "request": "launch",
+            "name": "Debug Jest Tests",
+            "cwd": "${workspaceFolder}",
+            "args": [
+                "--inspect-brk",
+                "${workspaceRoot}/node_modules/.bin/jest",
+                "--runInBand"
+            ],
+            "console": "integratedTerminal",
+            "internalConsoleOptions": "neverOpen"
+        },
+    ]
+}

__mocks__/Dom.ts

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+export const addDropDownItem = () => { }
+
+export const addImportForm = (syncFn: Function) => jest.fn();
+
+export const getDateSetting = (): string => 'a';
+
+export const getCSRFToken = (): string => "csrfToken";
+
+export const getMALUsername = () => 'malUsername';
+
+export const getAnilistUsername = () => 'anilistUsername';

__mocks__/Log.ts

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+export const clear = () => console.log('clearing console');
+export const error = (msg: string) => console.log('logging error', msg);
+export const info = (msg: string) => console.log('logging info', msg);
+export const addCountLog = (op: string, type: string, max: number) => console.log('creating count log for', op, type, max);
+export const updateCountLog = (op: string, type: string, ct: number) => console.log('updating count log for', op, type, ct);

__mocks__/util.ts

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+export const sleep = () => Promise.resolve();

__tests__/sync.test.ts

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+jest.mock('../src/Dom');
+jest.mock('../src/Log');
+jest.mock('../src/util');
+import { syncType } from '../src/MAL';
+import * as fetchMock from 'fetch-mock';
+import { completedAnime, completedAnilistAnime } from '../__testutils__/testData';
+
+// jest.useFakeTimers();
+
+describe('Sync', () => {
+    beforeAll(() => fetchMock.catch(500));
+    afterEach(() => fetchMock.restore());
+    it('should sync', async () => {
+        fetchMock
+            .mock(/.+load.json.+/, [completedAnime], { repeat: 1 })
+            .mock(/.+load.json.+/, []);
+        try {
+            await syncType('anime', [completedAnilistAnime], 'test', 'test');
+        } catch (e) {
+            console.error(e);
+        }
+        console.log(fetchMock.calls())
+    });
+});

__testutils__/setupJest.ts

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+import * as fetch from 'node-fetch';
+// @ts-ignore
+global.fetch = fetch;

__testutils__/testData.ts

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+import * as Types from '../src/Types';
+
+const createDate = (year = 0, month = 0, day = 0) => ({ year, month, day });
+
+const baseMalItem = (): Types.BaseMALItem => ({
+    status: 0,
+    csrf_token: 'csrfToken',
+    score: 10,
+    finish_date: createDate(),
+    start_date: createDate(),
+});
+
+export const completedAnime: Types.MALAnime = {
+    ...baseMalItem(),
+    status: 2,
+    anime_id: 1,
+    num_watched_times: 1,
+    num_watched_episodes: 12,
+};
+
+export const completedAnilistAnime: Types.FormattedEntry = {
+    status: 'COMPLETED',
+    score: 10,
+    progress: 12,
+    progressVolumes: 0,
+    startedAt: createDate(),
+    completedAt: createDate(),
+    repeat: 1,
+    type: 'anime',
+    id: 1,
+    title: 'title',
+};