diff --git a/1-js/03-code-quality/05-testing-mocha/3-pow-test-wrong/solution.md b/1-js/03-code-quality/05-testing-mocha/3-pow-test-wrong/solution.md
@@ -1,49 +1,49 @@
-The test demonstrates one of the temptations a developer meets when writing tests.

-What we have here is actually 3 tests, but layed out as a single function with 3 asserts.

-Sometimes it's easier to write this way, but if an error occurs, it's much less obvious what went wrong.

-If an error happens in the middle of a complex execution flow, then we'll have to figure out the data at that point. We'll actually have to *debug the test*.

-It would be much better to break the test into multiple `it` blocks with clearly written inputs and outputs.

-Like this:
```js
-describe("Raises x to power n", function() {
-  it("5 in the power of 1 equals 5", function() {
    assert.equal(pow(5, 1), 5);
  });

-  it("5 in the power of 2 equals 25", function() {
    assert.equal(pow(5, 2), 25);
  });

-  it("5 in the power of 3 equals 125", function() {
    assert.equal(pow(5, 3), 125);
  });
});
```

-We replaced the single `it` with `describe` and a group of `it` blocks. Now if something fails we would see clearly what the data was.

-Also we can isolate a single test and run it in standalone mode by writing `it.only` instead of `it`:


```js
-describe("Raises x to power n", function() {
-  it("5 in the power of 1 equals 5", function() {
    assert.equal(pow(5, 1), 5);
  });

*!*
-  // Mocha will run only this block
-  it.only("5 in the power of 2 equals 25", function() {
    assert.equal(pow(5, 2), 25);
  });
*/!*

-  it("5 in the power of 3 equals 125", function() {
    assert.equal(pow(5, 3), 125);
  });
});

diff --git a/1-js/03-code-quality/05-testing-mocha/3-pow-test-wrong/task.md b/1-js/03-code-quality/05-testing-mocha/3-pow-test-wrong/task.md
@@ -2,12 +2,12 @@ importance: 5

---

-# What's wrong in the test?

-What's wrong in the test of `pow` below?

```js
-it("Raises x to the power n", function() {
  let x = 5;

  let result = x;
@@ -21,4 +21,4 @@ it("Raises x to the power n", function() {
});
```

-P.S. Syntactically the test is correct and passes.
diff --git a/1-js/03-code-quality/05-testing-mocha/article.md b/1-js/03-code-quality/05-testing-mocha/article.md
diff --git a/1-js/03-code-quality/05-testing-mocha/beforeafter.view/index.html b/1-js/03-code-quality/05-testing-mocha/beforeafter.view/index.html
@@ -1,31 +1,31 @@
<!DOCTYPE html>
<html>
<head>
-  <!-- add mocha css, to show results -->
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/mocha/3.2.0/mocha.css">
-  <!-- add mocha framework code -->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/mocha/3.2.0/mocha.js"></script>
  <script>
-    // enable bdd-style testing
    mocha.setup('bdd');
  </script>
-  <!-- add chai -->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/chai/3.5.0/chai.js"></script>
  <script>
-    // chai has a lot of stuff, let's make assert global
    let assert = chai.assert;
  </script>
</head>

<body>

-  <!-- the script with tests (describe, it...) -->
  <script src="test.js"></script>

-  <!-- the element with id="mocha" will contain test results -->
  <div id="mocha"></div>

-  <!-- run tests! -->
  <script>
    mocha.run();
  </script>

diff --git a/1-js/03-code-quality/05-testing-mocha/beforeafter.view/test.js b/1-js/03-code-quality/05-testing-mocha/beforeafter.view/test.js
@@ -1,10 +1,10 @@
describe("test", function() {

-  before(() => alert("Testing started – before all tests"));
-  after(() => alert("Testing finished – after all tests"));

-  beforeEach(() => alert("Before a test – enter a test"));
-  afterEach(() => alert("After a test – exit a test"));

  it('test 1', () => alert(1));
  it('test 2', () => alert(2));

diff --git a/1-js/03-code-quality/05-testing-mocha/pow-1.view/index.html b/1-js/03-code-quality/05-testing-mocha/pow-1.view/index.html
@@ -1,18 +1,18 @@
<!DOCTYPE html>
<html>
<head>
-  <!-- add mocha css, to show results -->
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/mocha/3.2.0/mocha.css">
-  <!-- add mocha framework code -->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/mocha/3.2.0/mocha.js"></script>
  <script>
-    // enable bdd-style testing
    mocha.setup('bdd');
  </script>
-  <!-- add chai -->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/chai/3.5.0/chai.js"></script>
  <script>
-    // chai has a lot of stuff, let's make assert global
    let assert = chai.assert;
  </script>
</head>
@@ -21,17 +21,17 @@

  <script>
    function pow(x, n) {
-      /* function code is to be written, empty now */
    }
  </script>

-  <!-- the script with tests (describe, it...) -->
  <script src="test.js"></script>

-  <!-- the element with id="mocha" will contain test results -->
  <div id="mocha"></div>

-  <!-- run tests! -->
  <script>
    mocha.run();
  </script>

diff --git a/1-js/03-code-quality/05-testing-mocha/pow-1.view/test.js b/1-js/03-code-quality/05-testing-mocha/pow-1.view/test.js
@@ -1,6 +1,6 @@
describe("pow", function() {

-  it("raises to n-th power", function() {
    assert.equal(pow(2, 3), 8);
  });


diff --git a/1-js/03-code-quality/05-testing-mocha/pow-2.view/index.html b/1-js/03-code-quality/05-testing-mocha/pow-2.view/index.html
@@ -1,18 +1,18 @@
<!DOCTYPE html>
<html>
<head>
-  <!-- add mocha css, to show results -->
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/mocha/3.2.0/mocha.css">
-  <!-- add mocha framework code -->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/mocha/3.2.0/mocha.js"></script>
  <script>
-    // enable bdd-style testing
    mocha.setup('bdd');
  </script>
-  <!-- add chai -->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/chai/3.5.0/chai.js"></script>
  <script>
-    // chai has a lot of stuff, let's make assert global
    let assert = chai.assert;
  </script>
</head>
@@ -21,17 +21,17 @@

  <script>
    function pow(x, n) {
-      return 8; // :) we cheat!
    }
  </script>

-  <!-- the script with tests (describe, it...) -->
  <script src="test.js"></script>

-  <!-- the element with id="mocha" will contain test results -->
  <div id="mocha"></div>

-  <!-- run tests! -->
  <script>
    mocha.run();
  </script>

diff --git a/1-js/03-code-quality/05-testing-mocha/pow-3.view/test.js b/1-js/03-code-quality/05-testing-mocha/pow-3.view/test.js
@@ -2,7 +2,7 @@ describe("pow", function() {

  function makeTest(x) {
    let expected = x * x * x;
-    it(`${x} in the power 3 is ${expected}`, function() {
      assert.equal(pow(x, 3), expected);
    });
  }

diff --git a/1-js/03-code-quality/05-testing-mocha/pow-4.view/index.html b/1-js/03-code-quality/05-testing-mocha/pow-4.view/index.html
@@ -1,18 +1,18 @@
<!DOCTYPE html>
<html>
<head>
-  <!-- add mocha css, to show results -->
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/mocha/3.2.0/mocha.css">
-  <!-- add mocha framework code -->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/mocha/3.2.0/mocha.js"></script>
  <script>
-    // enable bdd-style testing
    mocha.setup('bdd');
  </script>
-  <!-- add chai -->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/chai/3.5.0/chai.js"></script>
  <script>
-    // chai has a lot of stuff, let's make assert global
    let assert = chai.assert;
  </script>
</head>
@@ -31,13 +31,13 @@
    }
  </script>

-  <!-- the script with tests (describe, it...) -->
  <script src="test.js"></script>

-  <!-- the element with id="mocha" will contain test results -->
  <div id="mocha"></div>

-  <!-- run tests! -->
  <script>
    mocha.run();
  </script>