pen/test/test-markdown-watcher.js

A better Markdown previewer

import assert from "assert";
import fs from "fs";
import helper from "./lib/helper";
import MarkdownWatcher from "../src/markdown-watcher";

describe("MarkdownWatcher", () => {
  let watcher;

  beforeEach(() => {
    helper.createFile("watcher-temp.md", "# hello");
  });

  afterEach(() => {
    watcher.stop();
    helper.clean();
  });

  it("reads a Markdown file and send parsed HTML data", done => {
    watcher = new MarkdownWatcher(helper.path("watcher-temp.md"));
    watcher
      .onData(data => {
        assert.equal(data, '<h1 id="hello">hello</h1>\n');
        done();
      })
      .onError(done);
  });

  it("send parsed HTML data again when the file is updated", done => {
    const callback = err => {
      if (err) {
        done(err);
      }
    };

    let called = 0;
    watcher = new MarkdownWatcher(helper.path("watcher-temp.md"));
    watcher
      .onData(data => {
        switch (called) {
          case 0:
            assert.equal(data, '<h1 id="hello">hello</h1>\n');
            fs.writeFile(
              helper.path("watcher-temp.md"),
              "```js\nvar a=10;\n```",
              callback
            );
            break;
          case 1:
            assert.equal(
              data,
              '<pre><code class="hljs language-js"><span class="hljs-keyword">var</span> a=<span class="hljs-number">10</span>;\n</code></pre>\n'
            );
            fs.writeFile(
              helper.path("watcher-temp.md"),
              "* nested\n  * nnested\n    * nnnested",
              callback
            );
            break;
          case 2:
            assert.equal(
              data,
              "<ul>\n<li>nested\n<ul>\n<li>nnested\n<ul>\n<li>nnnested</li>\n</ul>\n</li>\n</ul>\n</li>\n</ul>\n"
            );
            done();
            break;
        }
        called += 1;
      })
      .onError(done);
  });
});