Function mockExternalMessages

test/unit/utils/test-log.js:676–681

(messageTemplates)

    const syncResolve = (v) => ({then: (cb) => cb(v)});

    function mockExternalMessages(messageTemplates) {
      win.fetch = () =>
        syncResolve({json: () => syncResolve(messageTemplates)});

      log.fetchExternalMessagesOnce_();
    }

    beforeEach(() => {
      log = new Log(win, RETURNS_FINE);