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

Windmill

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

Quick

https://github.com/quick/quick
Programming language

Python

Swift

Category

UI Testing

Acceptance 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

Quick is a Swift (and Objective-C) testing framework.

Quick is a behavior-driven development framework for Swift and Objective-C that is inspired by RSpec, Specta, and Ginkgo. Quick comes bundled with Nimble a matcher framework for your tests.
xUnit
Set of frameworks originating from SUnit (Smalltalk's testing framework). They share similar structure and functionality.

No

Yes

Yes, it is an xUnit style test framework
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

Developers can test front-end behaviour and components by defining front-end feature specifications
Server-side
Allows testing the bahovior of a server-side code

No

Yes

Developers can test back-end behaviour and components by defining back-end feature specifications
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

Quick contains fixture methods setup() and teardown() for setting up and destroying test environments
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

Yes, example groups (logical groupings of examples/tests) can share setup and teardown code
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

N/A

Licence
Licence type governing the use and redistribution of the software

Apache License 2.0

Apache License 2.0

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

Yes, developers can create mock objects with Quick using the Cuckoo library
Grouping
Allows organizing tests in groups

N/A

Yes

In Quick test suites are named Specs, and every test suite you create starts off with a class inheriting from QuickSpec includes a main method, spec() which contains all the test cases.
Other
Other useful information about the testing framework