Windmill vs PHPSpec comparison of testing frameworks
What are the differences between Windmill and PHPSpec?

Windmill

https://pypi.org/project/windmill/

PHPSpec

https://www.phpspec.net/en/stable/
Programming language

Python

PHP

Category

UI Testing

Unit Testing

General info

Windmill is an Open Source Web UI testing framework for Python

Windmill is an Open Source AJAX Web UI testing framework that implements in-browser recording and playback, cross browser testing and test integration

PhpSpec is a testing tool based on the concept of emergent design using specification

PhpSpec is a tool to use at the spec level or SpecBDD, a type of BDD; It's process generates code for you and guides you through the SpecBDD process through the command line
xUnit
Set of frameworks originating from SUnit (Smalltalk's testing framework). They share similar structure and functionality.

No

No

Client-side
Allows testing code execution on the client, such as a web browser

Yes

Its main function is testing of front-end components and functionality

Yes

By testing your PHP classes that run your front-end
Server-side
Allows testing the bahovior of a server-side code

No

Yes

You can use PHPSpec to test your PHP classes that run your back-end
Fixtures
Allows defining a fixed, specific states of data (fixtures) that are test-local. This ensures specific environment for a single test

N/A

Yes

You can define fixtures
Group fixtures
Allows defining a fixed, specific states of data for a group of tests (group-fixtures). This ensures specific environment for a given group of tests.

N/A

Yes

You can define group fixtures
Generators
Supports data generators for tests. Data generators generate input data for test. The test is then run for each input data produced in this way.

Yes

By using third party libraries

Yes

There are methods that act as generators
Licence
Licence type governing the use and redistribution of the software

Apache License 2.0

Free

Mocks
Mocks are objects that simulate the behavior of real objects. Using mocks allows testing some part of the code in isolation (with other parts mocked when needed)

N/A

Yes

It has built in support for Mocks
Grouping
Allows organizing tests in groups

N/A

In PHPspec, you can group specification files by a certain namespace in a suite
Other
Other useful information about the testing framework