Mutual Dependency lesson is missing a test case

[AhmedHanyGamal]

The lesson on Ensuring Mutual Dependency does not include a test case that clearly shows the difference between mutual dependency and just using the required keyword.

The main difference is that with mutual dependency, a JSON document is still valid if it does not include either of the two related properties. But if instead required is used on the two properties, the document would be invalid.

As a result, the following schema passes the lesson, even though it shouldn't:

{
  "type": "object",
  "properties": {
    "name": {
      "type": "string"
    },
    "creditCardNumber": {
      "type": "string"
    },
    "address": {
      "type": "string"
    }
  },
  "required": [
    "name",
    "creditCardNumber",
    "address"
  ]
}

The following test case should fix this issue

{
  "name": "John Doe"
}

This should be valid with mutual dependency but would fail if required was used.

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