Test’em vs Atata comparison of testing frameworks
What are the differences between Test’em and Atata?

Test’em

https://github.com/testem/testem

Atata

https://atata.io/
Programming language

JavaScript

.NET

Category

Unit Testing

General info

A Unit testing test runner for JavaScript

Test'em is framework agnostic and has support for Jasmine, Qunit, Mocha and others through custom test framework adapters. It canalso run tests on all major browsers as well as Node and Phantomjs

Atata is a C# / .NET test automation framework for web

Atata is an open source test framework that uses fluent object pattern. It consists of the following concepts: components (controls and page objects), attributes of the control search, settings attributes, triggers, verification attributes and methods
xUnit
Set of frameworks originating from SUnit (Smalltalk's testing framework). They share similar structure and functionality.

It has an xUnit reporter

Yes

You can use Atata with xUnit frameworks
Client-side
Allows testing code execution on the client, such as a web browser

Yes

Atata is based on selenium and is used for browser automation. You can test various front-end functionalities and behaviours
Server-side
Allows testing the bahovior of a server-side code

No

Fixtures
Allows defining a fixed, specific states of data (fixtures) that are test-local. This ensures specific environment for a single test

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.

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.

Licence
Licence type governing the use and redistribution of the software

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)

Grouping
Allows organizing tests in groups

Other
Other useful information about the testing framework