Minitest vs JUnit comparison of testing frameworks
What are the differences between Minitest and JUnit?

Unit Testing

Unit Testing, Regression Testing

Complete suite of testing facilities

Minitest is small, fast, and it aims to make tests clean and readable. It supports test-driven development (TDD), behavior-driven development (BDD), mocking, and benchmarking.

JUnit is an open source Unit testing framework for java

JUnit is useful for developers to write and run repeatable tests. JUnit has been crucial in the development of test driven development and is partof the xUnit family of unit testing frameworks

Yes

MiniTest is an xUnit style framework in that is has assertion functions in the style of xUnit/TDD

Yes

It is an instance of the xUnit architecture for unit testing frameworks.

No

Yes

You can test front-end components such as individual classes and functions that create the front-end

Yes

You can test various back-end components

Yes

You can test classes and functions that compose the back-end such as database connections and so on

Yes

Minitest supports test fixture functions

Yes

JUnit contains a setUp() method, which runs before every test invocation and a tearDown() method, which runs after every test method.

Yes

Minitest has group fixtures

Yes

You can use setUp() and tearDown() inbuilt functions as group fixtures.

You can use JUnit-quickcheck to generate test data

MIT License

Yes

Mocking is available through the Minitest::Mock class which is a simple and clean mock object framework

JUnit does not support mocking internally but you can use a mock framework like Mockito to generate mock objects.

Yes

Allows grouping by nested Ruby classes. RSpec-like "context" method is available for spec syntax through the minitest-spec-context extension gem

Yes

In JUnit you can create a test suite that bundles a few unit test cases and runs them together. You use both @RunWith and @Suite annotation are used to run the suite test.