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AUTOMATE AND ORGANIZE TESTS
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You can now write tests with Mocha and Node’s assert.ok() ! In this lesson you learned to:

Install Mocha with npm
Organize tests with describe() and it()
Ensure your tests are isolated and expressive with the four phases of a test
Ensure your tests are reliable with hooks
Write assertions with assert.ok()
As you continue to write tests, remember to always evaluate them against the characteristics of a good test: fast, complete, reliable, isolated, maintainable, and expressive. If you are meeting these six criteria, you are creating high quality test frameworks!

const assert = require('assert');
const fs = require('fs');

describe('appendFileSync', () => {
  const path = './message.txt';
  
  afterEach(() => {
     // Teardown: delete path
    fs.unlinkSync(path);
  })
  
  it('writes a string to text file at given path name', () => {

    // Setup
    const str = 'Hello Node.js';
    
    // Exercise: write to file
    fs.appendFileSync(path, str);

    // Verify: compare file contents to string
    const contents = fs.readFileSync(path);
    assert.ok(contents.toString() === str);

   

  });
});

console.log = function() {};

const assert = require('chai').assert;
const fs = require('fs');
const Structured = require('structured');

const code = fs.readFileSync('./test/index_test.js', 'utf8');

describe('Checkpoint 4', () => {
  it('asserts that hook contains teardown', () => {

    let structure1 = function() { 
      describe(_, () => {
        afterEach( () => {
          fs.unlinkSync($path);
        });
      }); 
    };

    let structure2 = function() { 
      describe(_, () => {
        afterEach( function() {
          fs.unlinkSync($path);
        });
      }); 
    };

    let varCallbacks = {
      '$path': function(path) {
        if (path.name !== 'path') {
          return {failure: "`fs.unlinkSync()` missing argument `'path'`"};
        }
        return true;
      }
    };

    // assert that structure matches
    let isMatch1 = Structured.match(code, structure1, {varCallbacks: varCallbacks});
    let isMatch2 = Structured.match(code, structure2, {varCallbacks: varCallbacks});
    let failureMessage = 'Structure is not correct or hook is missing `fs.unlinkSync()`';
    assert.isOk(isMatch1 || isMatch2, varCallbacks.failure || failureMessage);

  });
});

{
  "name": "learn-mocha-intro-start",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "mocha test/**/*_test.js"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "mocha": "^3.5.3"
  }
}