Build Your Own Test Framework: A Practical Guide to Writing Better Automated Tests

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2023

D. IrvineBuild Your Own Test Frameworkhttps://doi.org/10.1007/978-1-4842-9247-1_15

15. Deep Equality and Constraining Matchers

Daniel Irvine¹  

(1)

London, UK

 

JavaScript is one of many languages that makes it easy to create object-like map structures with expressive syntax:

{

  customerId: 123,

  order: {

    time: 234,

    value: 56.99,

    items: [

      { id: 345, unitPrice: 5.00, quantity: 2 },

      { id: 456, unitPrice: 46.99, quantity: 1 }

    }]

  }

}

Often, objects like this are returned from functions and API calls, which means it helps to have a matcher that can match the values within this entire structure.

Even more importantly, it helps to have a matcher that ...