Fix our tests

Author: GarboMuffin

test/unit/tw-fetch-tool.js

@@ -0,0 +1,32 @@
+jest.mock('cross-fetch', () => {
+    const crossFetch = jest.requireActual('cross-fetch');
+
+    let attempt = 0;
+    const mockFetch = () => {
+        attempt++;
+        if (attempt === 1) {
+            // eslint-disable-next-line prefer-promise-reject-errors
+            return Promise.reject('Intentional error for testing');
+        }
+        return Promise.resolve({
+            ok: true,
+            arrayBuffer: () => Promise.resolve(new Uint8Array([100, 101, 102, 103]).buffer)
+        });
+    };
+
+    return {
+        ...crossFetch,
+        default: mockFetch,
+        fetch: mockFetch
+    };
+});
+
+const FetchTool = require('../../src/FetchTool');
+
+test('get() retries on error', async () => {
+    const tool = new FetchTool();
+    const result = await tool.get({url: 'url'});
+    expect(new Uint8Array(result)).toStrictEqual(new Uint8Array([
+        100, 101, 102, 103
+    ]));
+});

test/unit/tw-get-retries-on-error.test.js

@@ -0,0 +1,26 @@
+jest.mock('cross-fetch', () => {
+    const crossFetch = jest.requireActual('cross-fetch');
+
+    const mockFetch = () => Promise.resolve({
+        // This is what fetch() resolves with in a WKWebView when requesting a file: URL from a file: URL.
+        ok: false,
+        status: 0,
+        arrayBuffer: () => Promise.resolve(new Uint8Array([10, 20, 30, 40]).buffer)
+    });
+
+    return {
+        ...crossFetch,
+        default: mockFetch,
+        fetch: mockFetch
+    };
+});
+
+const FetchTool = require('../../src/FetchTool');
+
+test('get() returns success for status: 0, ok: false', async () => {
+    const tool = new FetchTool();
+    const result = await tool.get({url: 'url'});
+    expect(new Uint8Array(result)).toStrictEqual(new Uint8Array([
+        10, 20, 30, 40
+    ]));
+});