Resolve "Borestop"

Closes #25 (closed)

borestop/e2e/features/util/RetryUtils.ts

+import ProvidesCallback = jest.ProvidesCallback;
+import DoneCallback = jest.DoneCallback;
+import { waitFor } from './TimerUtils';
+
+const runTest = (handler: ProvidesCallback) =>
+  new Promise((resolve, reject) => {
+    const doneCallback = (): DoneCallback => {
+      const callback: any = (err: any) => (err ? reject(err) : resolve());
+      callback.fail = () => {};
+      return callback;
+    };
+
+    const result = handler(doneCallback());
+
+    if (result && result.then) {
+      result.catch(reject).then(resolve);
+    } else {
+      resolve();
+    }
+  });
+
+const waitBeforeRetry = (time: number) => waitFor(time);
+
+const withRetriesIt = async (name: string, fn: ProvidesCallback, maxTries: number, delay: number, timeout?: number) => {
+  it(
+    name,
+    async () => {
+      let latestError;
+      for (let retry = 1; retry <= maxTries; retry++) {
+        try {
+          await runTest(fn);
+
+          return;
+        } catch (error) {
+          latestError = error;
+          await waitBeforeRetry(delay);
+        }
+      }
+      throw latestError;
+    },
+    timeout
+  );
+};
+
+export interface RetryConfiguration {
+  maxTries: number;
+  delay: number;
+}
+
+export const TREEZOR_RETRIES: RetryConfiguration = { maxTries: 20, delay: 500 };
+
+export interface WithRetries {
+  it: (name: string, fn: ProvidesCallback, timeout?: number) => void;
+}
+
+export const withRetries = (conf: RetryConfiguration): WithRetries => ({
+  it: (name: string, fn: ProvidesCallback, timeout?: number) => withRetriesIt(name, fn, conf.maxTries, conf.delay, timeout),
+});