Mailspring/app/spec/services/inline-style-transformer-spec.es6

import {ipcRenderer} from 'electron'
import InlineStyleTransformer from '../../src/services/inline-style-transformer';

describe("InlineStyleTransformer", function specs() {
  describe("run", () => {
    beforeEach(() => {
      spyOn(ipcRenderer, 'send')
      spyOn(InlineStyleTransformer, '_injectUserAgentStyles').andCallFake((input) => input);
      InlineStyleTransformer._inlineStylePromises = {};
    });
    it("should return a Promise", () => {
      expect(InlineStyleTransformer.run("asd") instanceof Promise).toBe(true)
    });

    it("should resolve immediately if the html is empty", async () => {
      const promise = InlineStyleTransformer.run("")
      expect(await promise.isResolved()).toBe(true)
    });

    it("should resolve immediately if there is no <style> tag in the source", async () => {
      const promise = InlineStyleTransformer.run(`
      This is some tricky HTML but there's no style tag here!
      <I wonder if it'll get into trouble < style >. <Ohmgerd.>
      `)
      expect(await promise.isResolved()).toBe(true)
    });

    it("should properly remove comment tags used to prevent style tags from being displayed when they're not understood", () => {
      InlineStyleTransformer.run(`
      <style>
      <!--table
      {mso-displayed-decimal-separator:".";
      mso-displayed-thousand-separator:",";}
      -->
      </style>
      <style><!--table
      {mso-displayed-decimal-separator:".";
      mso-displayed-thousand-separator:",";}
      --></style>
      `)
      expect(ipcRenderer.send.mostRecentCall.args[1].html).toEqual(`
      <style>table
      {mso-displayed-decimal-separator:".";
      mso-displayed-thousand-separator:",";}
      </style>
      <style>table
      {mso-displayed-decimal-separator:".";
      mso-displayed-thousand-separator:",";}
      </style>
      `)
    });

    it("should add user agent styles", () => {
      InlineStyleTransformer.run(`<style>
      <!--table
        {mso-displayed-decimal-separator:".";
        mso-displayed-thousand-separator:",";}
      -->
      </style>Other content goes here`)
      expect(InlineStyleTransformer._injectUserAgentStyles).toHaveBeenCalled()
    });

    it("should fire inline-style-parse to the main process", () => {
      InlineStyleTransformer.run(`<style>
      <!--table
        {mso-displayed-decimal-separator:".";
        mso-displayed-thousand-separator:",";}
      -->
      </style>Other content goes here`)
      expect(ipcRenderer.send).toHaveBeenCalled()
      expect(ipcRenderer.send.mostRecentCall.args[0]).toEqual('inline-style-parse');
    });
  });
});