pen/test/test-watcher.js

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import assert from "assert";
import fs from "fs";
import helper from "./lib/helper";
import Watcher from "../src/watcher";

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

  beforeEach(() => {
    helper.createFile("test테스트テスト.txt", "hello");
  });

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

  it("reads a file", done => {
    watcher = new Watcher(helper.path("test테스트テスト.txt"));
    watcher
      .onData(data => {
        assert.equal(data.toString(), "hello");
        done();
      })
      .onError(done);
  });

  it("cannot read a wrong file", done => {
    let watcher = new Watcher(helper.path("watcher-wrong-temp"));
    watcher
      .onData(() => {
        done("there shouldn't be a file!");
      })
      .onError(error => {
        assert.equal(error.code, "ENOENT");
        done();
      });
  });

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

    let called = 0;
    watcher = new Watcher(helper.path("test테스트テスト.txt"));
    watcher
      .onData(data => {
        switch (called) {
          case 0:
            assert.equal(data.toString(), "hello");
            fs.writeFile(
              helper.path("test테스트テスト.txt"),
              "world",
              callback
            );
            break;
          case 1:
            assert.equal(data.toString(), "world");
            fs.writeFile(helper.path("test테스트テスト.txt"), "pen!", callback);
            break;
          case 2:
            assert.equal(data.toString(), "pen!");
            done();
            break;
        }
        called += 1;
      })
      .onError(done);
  });
});