Add JSON assertions

[peter279k]

Introduction

This is about the JSON assertions.

After looking at the official PHPUnit doc, it doesn't provide related JSON assertions.

Perhaps we can consider implementing following JSON assertions:

• assertIsJsonFile
• assertIsJsonString
• assertJsonStringContainsKey
• assertJsonStringContainsValue
• assertJsonFileContainsKey
• assertJsonFileContainsValue

@adhocore , what do you think about this?

• Bug/Issue
• Feature request
• General stuff

[adhocore]

sure. but some of them might be complex to implement and not frequently used